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New Member

2960 High Output Drops

I've been doing some searching around and can't seem to come up with a good solid answer here.  I have quite a few 2960's in a manufacturing environment that are experiencing a large number of Total Output Drops.  The gigabit uplinks arn't even close to fully subscribed and if I'm lucky they run at a peak of 4 - 5 Mb on a 1Gb uplink.  Something really funky is going on.  The individual switchports seem to have the total output drops and the uplinks at 1Gb do not have any output drops and never peak above 20Mb over a 3 month span on a 1Gb link.  Quite frustrating.  Please see my counter's below, I'm definitly up for suggestions!

********#  sh int fa0/10
FastEthernet0/10 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001b.2a56.9f0a (bia 001b.2a56.9f0a)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 11119416
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 113000 bits/sec, 43 packets/sec
  5 minute output rate 62000 bits/sec, 44 packets/sec
     9994159 packets input, 2559801911 bytes, 0 no buffer
     Received 13426 broadcasts (698 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 698 multicast, 0 pause input
     0 input packets with dribble condition detected
     17250074 packets output, 2754594875 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

********#sh int gi0/1
GigabitEthernet0/1 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 001b.2a56.9f31 (bia 001b.2a56.9f31)
  Description: Connection to CSW1 Port G6/14
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 224000 bits/sec, 149 packets/sec
  5 minute output rate 243000 bits/sec, 130 packets/sec
     329488291 packets input, 98533510592 bytes, 0 no buffer
     Received 95771995 broadcasts (73824483 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 73824483 multicast, 0 pause input
     0 input packets with dribble condition detected
     223115516 packets output, 43537654594 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

LC_F1_2960_2#show controllers utilization
Port       Receive Utilization  Transmit Utilization
Fa0/1              0                    0
Fa0/2              0                    0
Fa0/3              0                    0
Fa0/4              0                    0
Fa0/5              0                    0
Fa0/6              0                    0
Fa0/7              0                    0
Fa0/8              0                    0
Fa0/9              0                    0
Fa0/10             0                    0
Fa0/11             0                    0
Fa0/12             0                    0
Fa0/13             0                    0
Fa0/14             0                    0
Fa0/15             0                    0
Fa0/16             0                    0
Fa0/17             0                    0
Fa0/18             0                    0
Fa0/19             0                    0
Fa0/20             0                    0
Fa0/21             0                    0
Fa0/22             0                    0
Fa0/23             0                    0
Fa0/24             0                    0
Fa0/25             0                    0
Fa0/26             0                    0
Fa0/27             0                    0
Fa0/28             0                    0
Fa0/29             0                    0
Fa0/30             0                    0
Fa0/31             0                    0
Fa0/32             0                    0
Fa0/33             0                    0
Fa0/34             0                    0
Fa0/35             0                    0
Fa0/36             0                    0
Fa0/37             0                    0
Fa0/38             0                    0
Fa0/39             0                    0
Fa0/40             0                    0
Fa0/41             0                    0
Fa0/42             0                    0
Fa0/43             0                    0
Fa0/44             0                    0
Fa0/45             0                    0
Fa0/46             0                    0
Fa0/47             0                    0
Fa0/48             0                    0
Gi0/1              0                    0
Gi0/2              0                    0

Total Ports : 50
Switch Receive Bandwidth Percentage Utilization  : 0
Switch Transmit Bandwidth Percentage Utilization : 0

Switch Fabric Percentage Utilization : 0

Port-asic Port Drop Statistics - Summary
========================================
  RxQueue 0 Drop Stats: 0
  RxQueue 1 Drop Stats: 0
  RxQueue 2 Drop Stats: 0
  RxQueue 3 Drop Stats: 0

  Port  0 TxQueue Drop Stats: 0
  Port  1 TxQueue Drop Stats: 0
  Port  2 TxQueue Drop Stats: 0
  Port  3 TxQueue Drop Stats: 0
  Port  4 TxQueue Drop Stats: 5734547
  Port  5 TxQueue Drop Stats: 0
  Port  6 TxQueue Drop Stats: 5733888
  Port  7 TxQueue Drop Stats: 0
  Port  8 TxQueue Drop Stats: 5733653
  Port  9 TxQueue Drop Stats: 12621701
  Port 10 TxQueue Drop Stats: 12621214
  Port 11 TxQueue Drop Stats: 12622766
  Port 12 TxQueue Drop Stats: 5735188
  Port 13 TxQueue Drop Stats: 5734667
  Port 14 TxQueue Drop Stats: 11119214
  Port 15 TxQueue Drop Stats: 0

  Port 16 TxQueue Drop Stats: 0
  Port 17 TxQueue Drop Stats: 5733365
  Port 18 TxQueue Drop Stats: 0
  Port 19 TxQueue Drop Stats: 12782012
  Port 20 TxQueue Drop Stats: 0
  Port 21 TxQueue Drop Stats: 0
  Port 22 TxQueue Drop Stats: 5734815
  Port 23 TxQueue Drop Stats: 5733704
  Port 24 TxQueue Drop Stats: 0
  Port 25 TxQueue Drop Stats: 12621039

  Supervisor TxQueue Drop Statistics
    Queue  0: 0
    Queue  1: 0
    Queue  2: 0
    Queue  3: 0
    Queue  4: 0
    Queue  5: 0
    Queue  6: 0
    Queue  7: 0
    Queue  8: 0
    Queue  9: 0
    Queue 10: 0
    Queue 11: 0

    Queue 12: 0
    Queue 13: 0
    Queue 14: 0
    Queue 15: 0

Port-asic Port Drop Statistics - Details
========================================
  RxQueue Drop Statistics
    Queue 0
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 1
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 2
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 3
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0

  Port 4 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734547
....

LC_F1_2960_2#show platform pm if-numbers

interface gid  gpn  lpn  port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Fa0/1     1    1    1    0/2  1    1    1    local     Yes     Yes
Fa0/2     2    2    2    0/3  1    2    2    local     Yes     Yes
Fa0/3     3    3    3    0/4  1    3    3    local     Yes     Yes
Fa0/4     4    4    4    0/5  1    4    4    local     Yes     Yes
Fa0/5     5    5    5    0/6  1    5    5    local     Yes     Yes
Fa0/6     6    6    6    0/7  1    6    6    local     Yes     Yes
Fa0/7     7    7    7    0/8  1    7    7    local     Yes     Yes
Fa0/8     8    8    8    0/9  1    8    8    local     Yes     Yes
Fa0/9     9    9    9    0/10 1    9    9    local     Yes     Yes
Fa0/10    10   10   10   0/11 1    10   10   local     Yes     Yes
Fa0/11    11   11   11   0/12 1    11   11   local     Yes     Yes
Fa0/12    12   12   12   0/13 1    12   12   local     Yes     Yes
Fa0/13    13   13   13   0/14 1    13   13   local     Yes     Yes
Fa0/14    14   14   14   0/15 1    14   14   local     Yes     Yes
Fa0/15    15   15   15   0/16 1    15   15   local     Yes     Yes
Fa0/16    16   16   16   0/17 1    16   16   local     Yes     Yes
Fa0/17    17   17   17   0/18 1    17   17   local     Yes     Yes
Fa0/18    18   18   18   0/19 1    18   18   local     Yes     Yes
Fa0/19    19   19   19   0/20 1    19   19   local     Yes     Yes
Fa0/20    20   20   20   0/21 1    20   20   local     Yes     Yes
Fa0/21    21   21   21   0/22 1    21   21   local     Yes     Yes

interface gid  gpn  lpn  port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Fa0/22    22   22   22   0/23 1    22   22   local     Yes     Yes
Fa0/23    23   23   23   0/24 1    23   23   local     Yes     Yes
Fa0/24    24   24   24   0/25 1    24   24   local     Yes     Yes
Fa0/25    25   25   25   1/2  1    25   25   local     Yes     Yes
Fa0/26    26   26   26   1/3  1    26   26   local     Yes     Yes
Fa0/27    27   27   27   1/4  1    27   27   local     Yes     Yes
Fa0/28    28   28   28   1/5  1    28   28   local     Yes     Yes
Fa0/29    29   29   29   1/6  1    29   29   local     Yes     Yes
Fa0/30    30   30   30   1/7  1    30   30   local     Yes     Yes
Fa0/31    31   31   31   1/8  1    31   31   local     Yes     Yes
Fa0/32    32   32   32   1/9  1    32   32   local     Yes     Yes
Fa0/33    33   33   33   1/10 1    33   33   local     Yes     Yes
Fa0/34    34   34   34   1/11 1    34   34   local     Yes     Yes
Fa0/35    35   35   35   1/12 1    35   35   local     Yes     Yes
Fa0/36    36   36   36   1/13 1    36   36   local     Yes     Yes
Fa0/37    37   37   37   1/14 1    37   37   local     Yes     Yes
Fa0/38    38   38   38   1/15 1    38   38   local     Yes     Yes
Fa0/39    39   39   39   1/16 1    39   39   local     Yes     Yes
Fa0/40    40   40   40   1/17 1    40   40   local     Yes     Yes
Fa0/41    41   41   41   1/18 1    41   41   local     Yes     Yes
Fa0/42    42   42   42   1/19 1    42   42   local     Yes     Yes
Fa0/43    43   43   43   1/20 1    43   43   local     Yes     Yes
Fa0/44    44   44   44   1/21 1    44   44   local     Yes     Yes
Fa0/45    45   45   45   1/22 1    45   45   local     Yes     Yes

interface gid  gpn  lpn  port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Fa0/46    46   46   46   1/23 1    46   46   local     Yes     Yes
Fa0/47    47   47   47   1/24 1    47   47   local     Yes     Yes
Fa0/48    48   48   48   1/25 1    48   48   local     Yes     Yes
Gi0/1     49   49   49   1/1  1    1    49   local     Yes     Yes
Gi0/2     50   50   50   1/0  1    2    50   local     Yes     Yes
St1       104  104  0    16/0  1    0    0    internal  Yes     Yes

24 REPLIES
Bronze

Re: 2960 High Output Drops

What is the uptime of the switch? Can you post a 'show version' ?

Are you noticing any performance issues ?

New Member

Re: 2960 High Output Drops

Yea,

I've been getting calls about spotty/slow performance and the common link is the people connected to the 2960's.  I wonder if there is a bug in this code as the ones that have this issue predominantly seem to be running this code.  I think there is only one newer version out yet however...

******#sh ver
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(53)SE1, REL
EASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Fri 12-Mar-10 17:38 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01500000

ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE
(fc1)

*******  uptime is 5 weeks, 2 days, 20 hours, 18 minutes
System returned to ROM by power-on
System restarted at 16:17:03 EST Sat Jun 26 2010
System image file is "flash:c2960-lanbasek9-mz.122-53.SE1.bin"


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

cisco WS-C2960-48TC-L (PowerPC405) processor (revision B0) with 65536K bytes of
memory.
Processor board ID FOC1105U67Y
Last reset from power-on
2 Virtual Ethernet interfaces
48 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

64K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:1B:2A:56:9F:00
Motherboard assembly number     : 73-9835-07
Power supply part number        : 341-0097-02
Motherboard serial number       : FOC11054CRB
Power supply serial number      : AZS1104051N
Model revision number           : B0
Motherboard revision number     : C0
Model number                    : WS-C2960-48TC-L
System serial number            : FOC1105U67Y
Top Assembly Part Number        : 800-26672-02
Top Assembly Revision Number    : C0
Version ID                      : V02
CLEI Code Number                : 449064
Hardware Board Revision Number  : 0x02


Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 50    WS-C2960-48TC-L    12.2(53)SE1           C2960-LANBASEK9-M


Configuration register is 0xF

LC_F1_2960_2#

New Member

Re: 2960 High Output Drops

Also ran the sh tech through the command interpreter and was told there was one error and to do a sh buffers for command interpreter and this guy came back below...

Buffer elements:
     1505 in free list (500 max allowed)
     121113631 hits, 0 misses, 1024 created

Public buffer pools:
Small buffers, 104 bytes (total 40, permanent 25, peak 187 @ 5w2d):
     39 in free list (20 min, 60 max allowed)
     57380233 hits, 1764 misses, 5221 trims, 5236 created
     0 failures (0 no memory)
Middle buffers, 600 bytes (total 15, permanent 15, peak 66 @ 5w2d):
     13 in free list (10 min, 30 max allowed)
     1104400 hits, 213 misses, 639 trims, 639 created
     0 failures (0 no memory)
Big buffers, 1536 bytes (total 50, permanent 50, peak 104 @ 5w2d):
     50 in free list (5 min, 150 max allowed)
     18888320 hits, 416 misses, 1270 trims, 1270 created
     0 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 12, permanent 10, peak 12 @ 5w2d):
     1 in free list (0 min, 100 max allowed)
     56 hits, 1 misses, 340 trims, 342 created
     0 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0):
     0 in free list (0 min, 5 max allowed)
     0 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
Huge buffers, 18024 bytes (total 0, permanent 0):
     0 in free list (0 min, 2 max allowed)
     0 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)

Interface buffer pools:
RxQFB buffers, 2040 bytes (total 150, permanent 150):
     143 in free list (0 min, 150 max allowed)
     5049951 hits, 12921 misses
RxQ1 buffers, 2040 bytes (total 128, permanent 128):
     5 in free list (0 min, 128 max allowed)
     114782012 hits, 4397664 fallbacks
RxQ3 buffers, 2040 bytes (total 16, permanent 16):
     1 in free list (0 min, 16 max allowed)
     5998972 hits, 482616 fallbacks
RxQ4 buffers, 2040 bytes (total 64, permanent 64):
     0 in free list (0 min, 64 max allowed)
     2352783 hits, 3071840 misses
RxQ6 buffers, 2040 bytes (total 64, permanent 64):
     0 in free list (0 min, 64 max allowed)
     52648 hits, 95394 misses
RxQ7 buffers, 2040 bytes (total 96, permanent 96):
     31 in free list (0 min, 96 max allowed)
     1159325 hits, 0 misses
RxQ8 buffers, 2040 bytes (total 32, permanent 32):
     0 in free list (0 min, 32 max allowed)
     4110693 hits, 4122246 misses
RxQ10 buffers, 2040 bytes (total 16, permanent 16):
     1 in free list (0 min, 16 max allowed)
     2856890 hits, 182371 fallbacks
RxQ12 buffers, 2040 bytes (total 16, permanent 16):
     0 in free list (0 min, 16 max allowed)
     16 hits, 0 misses
RxQ15 buffers, 2040 bytes (total 4, permanent 4):
     0 in free list (0 min, 4 max allowed)
     65119756 hits, 65119752 misses
RxQ5 buffers, 2040 bytes (total 0, permanent 0):
     0 in free list (0 min, 0 max allowed)
     0 hits, 0 misses
RxQ11 buffers, 2040 bytes (total 4, permanent 4):
     0 in free list (0 min, 4 max allowed)
     4 hits, 0 misses
IPC buffers, 4096 bytes (total 2, permanent 2):
     1 in free list (1 min, 8 max allowed)
     1 hits, 0 fallbacks, 0 trims, 0 created
     0 failures (0 no memory)

Header pools:

SHOW BUFFERS ANALYSIS

ERROR: Since it's last reload, this router has created or maintained a relatively
large number of 'Big buffers' yet still has very few free buffers.

ERROR: Since it's last reload, this router has created or maintained a relatively
large number of 'VeryBig buffers' yet still has very few free buffers.

The above symptoms suggest that a buffer leak has occurred.

BUFFER LEAK: When a process is finished with a buffer, the process should free the
buffer. A buffer leak occurs when the code forgets to process a buffer, or forgets
to free it after.
It is done with the packet As a result, the buffer pool continues to grow as more
and more packets are stuck in the buffers. Some routers (for example, 2600, 3600,
and 4000 Series) require a minimum amount of I/O memory to support certain interface
processors.
Not Enough Shared Memory for the Interfaces.
NOTE:
(1)Some of the Public Buffer pools should be abnormally large with few free buffers.
After a reload, you may see that the number of free buffers never gets close to
the number of total buffers.
(2)You should check the buffers on a regular basis. Some leaks are slow but others
are very fast.
(3)If you configure or access the router through telnet,you need to check the buffers
on a regular basis via remote access (telnet) before the router hang to see in
which pool is the leak. Once you see that for one pool the total number is increasing
and the free number is low (the faulty pool), you need to capture a 'show buffer
pool  dump'. But if you don't have any memory available on the box, it's too late
to collect the information . You have to collect the information before the hang.
TRY THIS:
Router is running low on shared memory, even after a reload, physically removing
interfaces solves the problem.
This could be a Cisco IOS software bug. Upgrade to the latest version in your release
train to fix known buffer leak bugs. For example, if you are running Cisco IOS
Software Release 11.2(14), upgrade to the latest 11.2(x).
If you need assistence in the IOS upgradation and software download, please check
the below URL: Software Download Center
Commands to check the additional information about the content of the buffers:
show buffer pool (small - middle - big - verybig - large - huge): shows a summary
of the buffers for the specified pool.
show buffer pool (small - middle - big - verybig - large - huge) dump: shows a hex/ASCII
dump of all the buffers of a given pool.
show tech-support of the router.
How can we identify the pool encounters a problem:
(a) If number of misses & creates increases at high rate (as a % of hits)
(b) If consistently low number of buffers in free list
(c) If number of failure or number of  memory increases
REFERENCE: For more information see Troubleshooting Buffer Leaks
REFERENCE: For more information see Troubleshooting Memory Problems

INFO: The buffer counters can be cleared only by reloading the router.

INFO: Interfaces use the 'interface buffer' pools for input and output (I/O). When
there are no more buffers in the interface buffer free list, the router goes to
the public buffer pools as a fallback. Performance is not affected in case of a
fallback. Interface buffers should not be tuned.

Here is the output field terminology for the 'show buffers' command:
  - HITS: The number of buffers that have been requested from the buffer pool.
    This counter provides a mechanism to determine which pool must meet the
    highest demand for buffers.
  - MISSES: The number of times buffers have been requested, but the processor
    has detected a demand for additional buffers, and has been forced to create
    them. Thus this counter represents the number of times the router has been
    forced to create additional buffers.
  - MAX-ALLOWED: The maximum number of buffers in the free-list. If the number of
    buffers 'in free list' is greater than the 'max-allowed' value, the router will
    attempt to trim buffers from the pool. The 'max-allowed' parameter is used to
    prevent a pool from monopolizing buffers that it does not need anymore and free
    this memory back to the system for further use.
  - FREE-LIST: The number of buffers in the pool, ready for use.
  - MIN: The minimum number of buffers from the pool at any given time.
  - TRIMS: When the value 'in free list' exceeds that of 'max allowed' the processor
    trims the buffers.
  - CREATED: The number of buffers that are created when the free-list is less
    than the minimum buffers allowed, or is of zero value.
  - FAILURES: The number of failures met by the packets when there was a failure
    in an attempt to create buffers even after additional buffers were created.
    This counter represents the number of packets that have been dropped due to
    buffer shortage.
  - TOTAL: The total number of used and unused buffers.
  - PERMANENT: Identifies the permanent number of allocated buffers in the pool,
    that cannot be trimmed away.
  - NO MEMORY: The number of failures caused by insufficient memory to create
    additional buffers.
  - INITIAL: The temporary buffers allotted during system reload and for session
    establishments.
  - MAX-FREE & MIN-FREE: The maximum and minimum number of free buffers.

Bronze

Re: 2960 High Output Drops

Hi,

Can you clear the counters and post a 'show int fa0/10' and 'show plat port-asic stat drop' taken at a few different times? Let's check how fast these counters are incrementing.What is connected on this switchport?

Hall of Fame Super Gold

Re: 2960 High Output Drops

Can you please post the command output of "sh controller ethernet "?

New Member

Re: 2960 High Output Drops

Here is the info requested from both of you.  I'm going to clear the counters and collect data over the course of the morning in the form below.  These are

just average run of the mill PC's.  The users just enter part orders so they arn't doing any file transfers, etc.  As I noted also the gig link never appears to go above 20Mb on a 1Gb link, so I havn't convinced myself that it could even be burst traffic (especially given the user functions and the high number of ports experiencing the drops across these various 2960's).

******#sh plat port-asic stat drop asic 0

Port-asic Port Drop Statistics - Summary
========================================
  RxQueue 0 Drop Stats: 0
  RxQueue 1 Drop Stats: 0
  RxQueue 2 Drop Stats: 0
  RxQueue 3 Drop Stats: 0

  Port  0 TxQueue Drop Stats: 0
  Port  1 TxQueue Drop Stats: 0
  Port  2 TxQueue Drop Stats: 0
  Port  3 TxQueue Drop Stats: 0
  Port  4 TxQueue Drop Stats: 0
  Port  5 TxQueue Drop Stats: 11119684
  Port  6 TxQueue Drop Stats: 12622041
  Port  7 TxQueue Drop Stats: 0
  Port  8 TxQueue Drop Stats: 5734119
  Port  9 TxQueue Drop Stats: 12622665
  Port 10 TxQueue Drop Stats: 12621389
  Port 11 TxQueue Drop Stats: 11119426
  Port 12 TxQueue Drop Stats: 0
  Port 13 TxQueue Drop Stats: 5734856
  Port 14 TxQueue Drop Stats: 11119842
  Port 15 TxQueue Drop Stats: 12622082
  Port 16 TxQueue Drop Stats: 5734176
  Port 17 TxQueue Drop Stats: 0
  Port 18 TxQueue Drop Stats: 0
  Port 19 TxQueue Drop Stats: 0
  Port 20 TxQueue Drop Stats: 0
  Port 21 TxQueue Drop Stats: 5735392
  Port 22 TxQueue Drop Stats: 5735087
  Port 23 TxQueue Drop Stats: 0
  Port 24 TxQueue Drop Stats: 5734704
  Port 25 TxQueue Drop Stats: 0

  Supervisor TxQueue Drop Statistics
    Queue  0: 0
    Queue  1: 0
    Queue  2: 0
    Queue  3: 10647414
    Queue  4: 0
    Queue  5: 0
    Queue  6: 0
    Queue  7: 215
    Queue  8: 18191643
    Queue  9: 0
    Queue 10: 7021255
    Queue 11: 0
    Queue 12: 0
    Queue 13: 0
    Queue 14: 0
    Queue 15: 0

Port-asic Port Drop Statistics - Details
========================================
  RxQueue Drop Statistics
    Queue 0
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 1
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 2
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 3
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0

  Port 0 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 1 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 2 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 3 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 4 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 5 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119684

  Port 6 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12622041

  Port 7 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 8 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734119

  Port 9 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12622665

  Port 10 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12621389

  Port 11 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119426

  Port 12 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 13 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734856

  Port 14 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119842

  Port 15 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12622082

  Port 16 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734176

  Port 17 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 18 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 19 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 20 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 21 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5735392

  Port 22 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5735087

  Port 23 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 24 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734704

  Port 25 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
  Supervisor TxQueue Drop Statistics
    Queue  0: 0
    Queue  1: 0
    Queue  2: 0
    Queue  3: 10647414
    Queue  4: 0
    Queue  5: 0
    Queue  6: 0
    Queue  7: 215
    Queue  8: 18191643
    Queue  9: 0
    Queue 10: 7021255
    Queue 11: 0
    Queue 12: 0
    Queue 13: 0
    Queue 14: 0
    Queue 15: 0
******#sh plat port-asic stat drop asic 1

Port-asic Port Drop Statistics - Summary
========================================
  RxQueue 0 Drop Stats: 0
  RxQueue 1 Drop Stats: 0
  RxQueue 2 Drop Stats: 0
  RxQueue 3 Drop Stats: 0

  Port  0 TxQueue Drop Stats: 0
  Port  1 TxQueue Drop Stats: 0
  Port  2 TxQueue Drop Stats: 0
  Port  3 TxQueue Drop Stats: 0
  Port  4 TxQueue Drop Stats: 5734547
  Port  5 TxQueue Drop Stats: 0
  Port  6 TxQueue Drop Stats: 5733888
  Port  7 TxQueue Drop Stats: 0
  Port  8 TxQueue Drop Stats: 5733653
  Port  9 TxQueue Drop Stats: 12621701
  Port 10 TxQueue Drop Stats: 12621214
  Port 11 TxQueue Drop Stats: 12622766
  Port 12 TxQueue Drop Stats: 5735188
  Port 13 TxQueue Drop Stats: 5734667
  Port 14 TxQueue Drop Stats: 11119214
  Port 15 TxQueue Drop Stats: 0
  Port 16 TxQueue Drop Stats: 0
  Port 17 TxQueue Drop Stats: 5733365
  Port 18 TxQueue Drop Stats: 0
  Port 19 TxQueue Drop Stats: 12782012
  Port 20 TxQueue Drop Stats: 0
  Port 21 TxQueue Drop Stats: 0
  Port 22 TxQueue Drop Stats: 5734815
  Port 23 TxQueue Drop Stats: 5733704
  Port 24 TxQueue Drop Stats: 0
  Port 25 TxQueue Drop Stats: 12621039

  Supervisor TxQueue Drop Statistics
    Queue  0: 0
    Queue  1: 0
    Queue  2: 0
    Queue  3: 0
    Queue  4: 0
    Queue  5: 0
    Queue  6: 0
    Queue  7: 0
    Queue  8: 0
    Queue  9: 0
    Queue 10: 0
    Queue 11: 0
    Queue 12: 0
    Queue 13: 0
    Queue 14: 0
    Queue 15: 0

Port-asic Port Drop Statistics - Details
========================================
  RxQueue Drop Statistics
    Queue 0
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 1
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 2
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0
    Queue 3
    Weight 0 Frames: 0
    Weight 1 Frames: 0
    Weight 2 Frames: 0

  Port 0 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 1 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 2 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 3 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 4 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734547

  Port 5 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 6 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5733888

  Port 7 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 8 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5733653

  Port 9 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12621701

  Port 10 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12621214

  Port 11 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12622766

  Port 12 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5735188

  Port 13 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734667

  Port 14 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119214

  Port 15 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 16 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 17 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5733365

  Port 18 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 19 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12782012

  Port 20 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 21 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 22 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734815

  Port 23 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5733704

  Port 24 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0

  Port 25 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 12621039
  Supervisor TxQueue Drop Statistics
    Queue  0: 0
    Queue  1: 0
    Queue  2: 0
    Queue  3: 0
    Queue  4: 0
    Queue  5: 0
    Queue  6: 0
    Queue  7: 0
    Queue  8: 0
    Queue  9: 0
    Queue 10: 0
    Queue 11: 0
    Queue 12: 0
    Queue 13: 0
    Queue 14: 0
    Queue 15: 0

******#sh platform port-asic stats drop fa0/7

  Interface Fa0/7 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734119


******#sh controllers ethernet-controller fa0/10

     Transmit FastEthernet0/10                Receive
   2853768557 Bytes                       2702313896 Bytes
     10959475 Unicast frames                10431998 Unicast frames
      4016481 Multicast frames                   717 Multicast frames
      2876205 Broadcast frames                 12986 Broadcast frames
            0 Too old frames              2700836311 Unicast bytes
            0 Deferred frames                  56930 Multicast bytes
            0 MTU exceeded frames            1420655 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames              966218 Minimum size frames
            0 8 collision frames             2730536 65 to 127 byte frames
            0 9 collision frames             5243987 128 to 255 byte frames
            0 10 collision frames             318685 256 to 511 byte frames
            0 11 collision frames              89214 512 to 1023 byte frames
            0 12 collision frames            1097061 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
      4506945 64 byte frames                       0 Valid frames, too small
      7779206 127 byte frames
      3582375 255 byte frames                      0 Too old frames
      1160891 511 byte frames                      0 Valid oversize frames
       455678 1023 byte frames                     0 System FCS error frames
       367066 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

******#show platform port-asic stats drop fa0/10

  Interface Fa0/10 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119426

New Member

Re: 2960 High Output Drops

Of course, it looks like since I'm trying to narrow it down to a specific period of time that the switch/end devices arn't going to cooperate.  It looks like at some point over the course of the weekend there were a few drops but, not many at all...

10:35AM
******
clear counters
FastEthernet0/10 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001b.2a56.9f0a (bia 001b.2a56.9f0a)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:00:25
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 84000 bits/sec, 26 packets/sec
  5 minute output rate 51000 bits/sec, 28 packets/sec
     951 packets input, 292432 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     965 packets output, 190413 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
******#

******#sh platform port-asic stat drop fa0/10

  Interface Fa0/10 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119426
******#


******#sh controllers ethernet-controller fa0/10

     Transmit FastEthernet0/10                Receive
   3020105915 Bytes                       2947240556 Bytes
     11733309 Unicast frames                11200991 Unicast frames
      4109379 Multicast frames                   758 Multicast frames
      2953370 Broadcast frames                 13632 Broadcast frames
            0 Too old frames              2945689144 Unicast bytes
            0 Deferred frames                  60244 Multicast bytes
            0 MTU exceeded frames            1491168 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames             1017268 Minimum size frames
            0 8 collision frames             2910820 65 to 127 byte frames
            0 9 collision frames             5631660 128 to 255 byte frames
            0 10 collision frames             337843 256 to 511 byte frames
            0 11 collision frames              96534 512 to 1023 byte frames
            0 12 collision frames            1221256 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
      4641622 64 byte frames                       0 Valid frames, too small
      8215309 127 byte frames
      3832538 255 byte frames                      0 Too old frames
      1231399 511 byte frames                      0 Valid oversize frames
       490389 1023 byte frames                     0 System FCS error frames
       384801 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

******#

=============================================================================================================================


******#sh int fa0/7
FastEthernet0/7 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001b.2a56.9f07 (bia 001b.2a56.9f07)
  Description: ViaStore_Device
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:03:00
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 1000 bits/sec, 2 packets/sec
     82 packets input, 8749 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     486 packets output, 37340 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

******#sh platform port-asic stat drop fa0/7

  Interface Fa0/7 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734119
******#

******#sh controllers ethernet-controller fa0/7

     Transmit FastEthernet0/7                 Receive
   1859222915 Bytes                        132380798 Bytes
      2592766 Unicast frames                 1371897 Unicast frames
      7780554 Multicast frames                    83 Multicast frames
      4644552 Broadcast frames                 21044 Broadcast frames
            0 Too old frames               130969908 Unicast bytes
            0 Deferred frames                  22637 Multicast bytes
            0 MTU exceeded frames            1352126 Broadcast bytes
            0 1 collision frames                  63 Alignment errors
            0 2 collision frames                  69 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                1741 Collision fragments
            0 6 collision frames
            0 7 collision frames              387639 Minimum size frames
            0 8 collision frames              913383 65 to 127 byte frames
            0 9 collision frames               79868 128 to 255 byte frames
            0 10 collision frames              12118 256 to 511 byte frames
            0 11 collision frames                128 512 to 1023 byte frames
            0 12 collision frames                 20 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames               1741 Invalid frames, too small
      5461013 64 byte frames                       0 Valid frames, too small
      8298386 127 byte frames
       493420 255 byte frames                      0 Too old frames
       331668 511 byte frames                      0 Valid oversize frames
        20832 1023 byte frames                     0 System FCS error frames
       412553 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

******#

=============================================================================================================================
2:00PM Check - No Errors Incremented Yet Since Clear Counters
=============================================================================================================================
=============================================================================================================================
8:20AM Check - No Errors Incremented Yet Since Clear Counters
=============================================================================================================================
=============================================================================================================================
8:10AM Check - Monday Morning
=============================================================================================================================
******#sh int fa0/10
FastEthernet0/10 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001b.2a56.9f0a (bia 001b.2a56.9f0a)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters 3d21h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 28000 bits/sec, 2 packets/sec
  5 minute output rate 5000 bits/sec, 3 packets/sec
     907212 packets input, 283324038 bytes, 0 no buffer
     Received 690 broadcasts (63 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 63 multicast, 0 pause input
     0 input packets with dribble condition detected
     1535499 packets output, 229869480 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
******#

******#sh platform port-asic stats drop fa0/10

  Interface Fa0/10 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 11119431

******#sh controllers ethernet-controller fa0/10

     Transmit FastEthernet0/10                Receive
   3249394876 Bytes                       3229522047 Bytes
     12696223 Unicast frames                12104276 Unicast frames
      4440013 Multicast frames                   821 Multicast frames
      3191793 Broadcast frames                 14255 Broadcast frames
            0 Too old frames              3227893443 Unicast bytes
            0 Deferred frames                  65311 Multicast bytes
            0 MTU exceeded frames            1563293 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames             1083341 Minimum size frames
            0 8 collision frames             3124485 65 to 127 byte frames
            0 9 collision frames             6084222 128 to 255 byte frames
            0 10 collision frames             359876 256 to 511 byte frames
            0 11 collision frames             104145 512 to 1023 byte frames
            0 12 collision frames            1363283 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
      5078190 64 byte frames                       0 Valid frames, too small
      8861374 127 byte frames
      4129858 255 byte frames                      0 Too old frames
      1317438 511 byte frames                      0 Valid oversize frames
       533848 1023 byte frames                     0 System FCS error frames
       407321 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

******#

=============================================================================================================================
******#sh int fa0/7
FastEthernet0/7 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001b.2a56.9f07 (bia 001b.2a56.9f07)
  Description: ViaStore_Device
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters 3d21h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     124660 packets input, 12241880 bytes, 0 no buffer
     Received 1742 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     19 input errors, 10 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     795269 packets output, 97560035 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
******#

******#sh platform port-asic stats drop fa0/7

  Interface Fa0/7 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 5734119
******#

******#sh controllers ethernet-controller fa0/7

     Transmit FastEthernet0/7                 Receive
   1956711254 Bytes                        144588424 Bytes
      2819143 Unicast frames                 1494488 Unicast frames
      8111222 Multicast frames                    83 Multicast frames
      4881892 Broadcast frames                 22785 Broadcast frames
            0 Too old frames               143062897 Unicast bytes
            0 Deferred frames                  22637 Multicast bytes
            0 MTU exceeded frames            1463550 Broadcast bytes
            0 1 collision frames                  72 Alignment errors
            0 2 collision frames                  79 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                1812 Collision fragments
            0 6 collision frames
            0 7 collision frames              414145 Minimum size frames
            0 8 collision frames             1001945 65 to 127 byte frames
            0 9 collision frames               87906 128 to 255 byte frames
            0 10 collision frames              13352 256 to 511 byte frames
            0 11 collision frames                139 512 to 1023 byte frames
            0 12 collision frames                 20 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames               1812 Invalid frames, too small
      5895648 64 byte frames                       0 Valid frames, too small
      8612241 127 byte frames
       506598 255 byte frames                      0 Too old frames
       338286 511 byte frames                      0 Valid oversize frames
        22131 1023 byte frames                     0 System FCS error frames
       437353 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

******#

Hall of Fame Super Gold

Re: 2960 High Output Drops

So whatever is connected to Fa0/10 is a PC?  It looks like the switch is pushing data  as much as it could but the PC could only take a fraction.  Like feeding someone with a shovel and the person just vomits. 

New Member

Re: 2960 High Output Drops

Yep, just a standard HP PC just like port 7 or any of the other ports.  I'm monitoring throughput within Solarwinds on a 30 second interval and I'm not seeing any bandwidth spikes.  This isn't the only 2960 we have that's doing this.  I started the interval data collection this morning.  As soon as the counter increases, I'll post again.

New Member

Re: 2960 High Output Drops

Richard,

Sorry I don't have a solution, as I'm actually experiencing symptoms very similar to yours on some new 2960S switches.  Just curious if you found a root cause or resolution for your issue?


Thanks!

New Member

Re: 2960 High Output Drops

Hi Richard,

Output drops on the port-asic always indicate you have oversubscribed the port-asic buffer space. 2960 uses 4 output queues to provide some QoS functionality in hardware at wire-speed. If you have 'mls qos' configured without any further port level config, you will find the available buffer space will be split between these 4 queues. Each queue will receive certain DSCP/CoS values and the queues will transmit in a shared round robin fashion.

Essentially::

- is 'mls qos' enabled?

- if yes, is it needed?

- if yes, can we make changes?

If you dont have 'mls qos' enabled, then you need higher linespeed as you are experiencing micro-burst that doesnt get picked up over a 30 second period. Its frustrating to find this scenario, however as mentioned, port-asic drops are simply oversubscription of buffer space over _some_ period of time. Often output drops such as yours will result from very short bursts of traffic.

2960 uses the same QoS architecture as 3560 and 3750, hence the following excellent guide is very relevant and applicable:

http://cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a0080883f9e.shtml

/ijay

New Member

Re: 2960 High Output Drops

Ian,

I am also having port asic drops, as you can see here.

X-TX-COPPELL-2960#show controllers ethernet-controller port-asic statistics                 
===========================================================================
Switch 2, PortASIC 0 Statistics
---------------------------------------------------------------------------

         0 TxBufferFull Drop Count   
         0 TxBufferFrameDesc BadCrc16
         0 TxBuffer Bandwidth Drop Cou
         0 TxQueue Bandwidth Drop Coun
         0 TxQueue Missed Drop Statist
         0 RxBuffer Drop DestIndex Cou
         0 SneakQueue Drop Count     
         0 Learning Queue Overflow Fra
         0 TxBufferFrameDesc BadCrc16            0 Rx NP Packet Count0       
         0 RxBuffer Drop DestIndex Cou   253147128 Rx NP Packet Count1      

     16409 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
         0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
         0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
         0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
         0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
         0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
         0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
    448364 Sup Queue 7 Drop Frames               8 Sup Queue 15 Drop Frames 

I am also seeing something weird here on switch one of my stack.

cpu-queue-frames  retrieved  dropped    invalid    hol-block  stray
----------------- ---------- ---------- ---------- ---------- ----------
rpc               75147109   0          0          0          0        
stp               90         0          2542282    0          0      

That seems like a really high number on the invalid counter...

New Member

Re: 2960 High Output Drops

More relevant than drops occurring, is: Are there any applications or protocols experiencing issues?

Controller drops can be normal behaviour of a switch depending on the topology. The drops here are going to CPU-Queues and may be normal if you dont want to receive those types of packets at CPU from that port.

Looking at the output, you are dropping STP frames destined to CPU. Are there any BPDU's received on this port-asic? Should there be? Are you experiencing STP instability?

Again, I would like to focus on the impact to the network rather than explaining the counter as these types of counters can often be normal operation.

New Member

Re: 2960 High Output Drops

We have a set of Avaya phones hanging off of various ports in the switch stack, across all 4 switches. And about every 2-3 weeks

the users at the call center start having intermittent phone problems, static, jitter, dropped calls, etc for calls coming in over the WAN and through

this stack. As soon as we reload the stack all problems clear up for another 2.5-3.5 weeks then start again. The counters were just one of the things that were found. I think it is an effect rather and not a cause.

Hall of Fame Super Gold

Re: 2960 High Output Drops

I am very curious to know why a 100% correct post by Ian above has been low-rated as 2 stars.

However I do not think the responsible person will come forward and much less with a rational explaination.

I have rated 5 the post above, as that is what is worth.

Hall of Fame Super Gold

Re: 2960 High Output Drops

I am very curious to know why a 100% correct post by Ian above has been low-rated as 2 stars.

Probably because the OP didn't like the answer (even though it's correct).

New Member

Re: 2960 High Output Drops

Everyone, please excuse my hijacking this thread.

Ian, I manage a largish-network. We have a Zimbra email system, and at times that correlate with a poor user experience (slowness, timeouts), the interfaces to which those servers connect experence bursts of TXOutputQdrops. (I see these both in the IOS command-line stats and in our Zenoss monitoring system.) They are connected to a 3560 running Cisco IOS Software, C3560 Software (C3560-IPBASEK9-M), Version 12.2(46)SE, RELEASE SOFTWARE (fc2). 5-minute traffic stats show pretty tame traffic - 30-100 Mbps on a Gig interface.

What puzzles me is how QoS could possibly help. The traffic, depending on the server (MTA or user GUI interface) is either all port 25 or all port 443. So, how could I prioritize packets to stop the TXOQDs?

Also, I'm still confused as to if there can be any culpability of the server. If it cannot "keep up", could that cause the TXOQD counter to increment? I would think not, but as I said, I am confused.

A few stats:

ECB-3560G-1A.6#sh platform port-asic stats drop gi0/19

  Interface Gi0/19 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 787


ECB-3560G-1A.6#sh controllers ethernet-controller gi0/17

     Transmit GigabitEthernet0/17             Receive
   2648991964 Bytes                       4025987434 Bytes
     85242420 Unicast frames              1207153645 Unicast frames
      6422004 Multicast frames                    66 Multicast frames
     10878354 Broadcast frames                 14058 Broadcast frames
            0 Too old frames              4025074428 Unicast bytes
            0 Deferred frames                  13294 Multicast bytes
            0 MTU exceeded frames             899712 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames          2230358639 Minimum size frames
            0 8 collision frames           432550698 65 to 127 byte frames
            0 9 collision frames          1276924028 128 to 255 byte frames
            0 10 collision frames          541007290 256 to 511 byte frames
            0 11 collision frames          193595908 512 to 1023 byte frames
            0 12 collision frames          827698502 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
   2072121016 64 byte frames                       0 Valid frames, too small
    512618292 127 byte frames
   1112788246 255 byte frames                      0 Too old frames
    330206005 511 byte frames                      0 Valid oversize frames
    348277996 1023 byte frames                     0 System FCS error frames
     21498519 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

ECB-3560G-1A.6#sh controllers ethernet-controller gi0/19

     Transmit GigabitEthernet0/19             Receive
     19327170 Bytes                       2804425779 Bytes
    606210102 Unicast frames               887334761 Unicast frames
      6422512 Multicast frames                   181 Multicast frames
     10875562 Broadcast frames                 17700 Broadcast frames
            0 Too old frames              2803255761 Unicast bytes
            0 Deferred frames                  37218 Multicast bytes
            0 MTU exceeded frames            1132800 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames              872201 Minimum size frames
            0 8 collision frames           272164604 65 to 127 byte frames
            0 9 collision frames            43565501 128 to 255 byte frames
            0 10 collision frames          107116223 256 to 511 byte frames
            0 11 collision frames           31669377 512 to 1023 byte frames
            0 12 collision frames          431964736 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
     11558448 64 byte frames                       0 Valid frames, too small
    174269841 127 byte frames
    172657955 255 byte frames                      0 Too old frames
     24708751 511 byte frames                      0 Valid oversize frames
     22087049 1023 byte frames                     0 System FCS error frames
    218226132 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

And a snip of thesh controllers ethernet-controller port-asic statistics outpit

...

Switch 1, PortASIC 9 Statistics
---------------------------------------------------------------------------
         0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames
        52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames
         0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames

         0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames
         0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames
         0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames

         0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames
         0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames
3009663797 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames

         0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames
         0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames
         0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames


         0 TxBufferFull Drop Count               0 Rx Fcs Error Frames
         0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
         0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
         0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
         0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
       122 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames
         0 SneakQueue Drop Count                 0 Tx Too Old Frames
         0 Learning Queue Overflow Fra           0 System Fcs Error Frames
         0 Learning Cam Skip Count

         0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames
         0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames
         0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames
         0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames
         0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames
         0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames
         0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames
         0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames
===========================================================================

I'm in over my head here, and help greatly appreciated.

Thanks!

Steve

New Member

2960 High Output Drops

Richard,

Did you ever resolve this issue or find a solution?  We are seeing the exact same behvaior described here.  We are running multiple WS-C2960S-48TD-L switches with the latest maintenance release, 12.2(58)SE2.

New Member

2960 High Output Drops

Hello!

I just confirm, that we have similar problem on stacked switch platform WS-C3750G-24TS-1U & WS-C3750E-24TD with release 12.2(58)SE2. We did update IOS version recently. We didn't saw this problem on previouse version,

Do you have any solution for this issue? Is it bug?

New Member

2960 High Output Drops

We also had this issue.

If you have a test-bed; switch of mls qos in global mode.

Then check if your performance improves drastically. If so, you wil be in the same issue as we had.

We later finetuned mls to have mls without high drops.

New Member

2960 High Output Drops

We use the same mls qos config as on previous version 12.2(55)SE.

Moreover we do not see such statistic in output of command "sh mls qos interface statistics".

Command "sh interface" shows 3-4 Mega packets per second, when traffic on interface less then 1Gbps and rate no change after update.

I think this bug!

New Member

2960 High Output Drops

We also had great performance on 1000BT interfaces , but lousy performance on 100BT connections.

This is happening due to the much bigger buffers on 1Gig interfaces (when using mls qos).

So try  : no mls qos (on a testbed) 

Super Bronze

2960 High Output Drops

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Posting

2960 uses the same QoS architecture as 3560 and 3750, hence the following excellent guide is very relevant and applicable:

http://cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a0080883f9e.shtml

Another excellent reference: https://supportforums.cisco.com/docs/DOC-8093

New Member

2960 High Output Drops

Hi,

maybe the main problem is due to ingress vs. egress speed difference.

Your ingress is 1Gbps, egress ist 100 Mbps ?

Have a look at CSCte64832.

I found it on release notes

http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_53_se/release/notes/OL22233.html

I think it is a overall problem, when traffic bursts are on the network with ingress/egress speed mismatch.

I also have the problem with citrix traffic and software distribution like SCCM.

We lowered the drops with queue threshold increases, but we used higher thresholds than 2000. It's seems like experimenting in the life network.

The other way is to use 1Gbps Client ports, wie tried it (Cat2960S + Gigabit Endsystems) but could not role out in the field because of usage of 100 Mbps IP-phone.

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