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Total output drops counters ? Network deceleration

Hi ,

On a 4507R Sup 4  redundant, IOS version 12.2-44.SG

I have an WS-X4548-GB-RJ45 in slot 7.

On this card are connected Servers (and Vmware) in access mode L2.

On all interface slot 7 who is in up/up state the output drops counters increase in gust. why ?

What means the output drops ?

.

In slot 3 and 4 I have the other switch attachement in trunk mode L2, there is no output drops counter problem.

But I see that on slot 5 and 6 I have WS-X4232-GB-RJ and WS-X4148-RJ card, with other server who has the counter output drops increase, but only on some interface.

In general the users complain about deceleration network.

I test to remove the flow control on a server cluster interface on switch side and server side but the problem persist.

Any idea ? Which can be the problem ?

Show mod:

Chassis Type : WS-C4507R

Power consumed by backplane : 40 Watts

Mod Ports Card Type                              Model
---+-----+--------------------------------------+------------------+
1     2  Supervisor IV 1000BaseX (GBIC)         WS-X4515
2     2  Supervisor IV 1000BaseX (GBIC)         WS-X4515
3    18  1000BaseX (GBIC)                       WS-X4418-GB
4     6  1000BaseX (GBIC)                       WS-X4306-GB
5    34  10/100BaseTX (RJ45), 1000BaseX (GBIC)  WS-X4232-GB-RJ
6    48  10/100BaseTX (RJ45)                    WS-X4148-RJ
7    48  10/100/1000BaseT (RJ45)                WS-X4548-GB-RJ45

Example on interface G7/3, counter clear 1 hour 36 minutes:

GigabitEthernet7/3 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 0021.d894.d1d2 (bia 0021.d894.d1
d2)
  Description: VMWARE5A.AT1
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is on, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 01:36:32
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 17163
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 338000 bits/sec, 175 packets/sec
  5 minute output rate 758000 bits/sec, 256 packets/sec
     1056176 packets input, 256376196 bytes, 0 no buffer
     Received 11824 broadcasts (11572 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     1693482 packets output, 683221392 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 output buffer failures, 0 output buffers swapped out

Thank you by advance

Hervé

1 REPLY

Re: Total output drops counters ? Network deceleration

Hi ,

On a 4507R Sup 4  redundant, IOS version 12.2-44.SG

I have an WS-X4548-GB-RJ45 in slot 7.

On this card are connected Servers (and Vmware) in access mode L2.

On all interface slot 7 who is in up/up state the output drops counters increase in gust. why ?

What means the output drops ?

.

In slot 3 and 4 I have the other switch attachement in trunk mode L2, there is no output drops counter problem.

But I see that on slot 5 and 6 I have WS-X4232-GB-RJ and WS-X4148-RJ card, with other server who has the counter output drops increase, but only on some interface.

In general the users complain about deceleration network.

I test to remove the flow control on a server cluster interface on switch side and server side but the problem persist.

Any idea ? Which can be the problem ?

Show mod:

Chassis Type : WS-C4507R

Power consumed by backplane : 40 Watts

Mod Ports Card Type                              Model
---+-----+--------------------------------------+------------------+
1     2  Supervisor IV 1000BaseX (GBIC)         WS-X4515
2     2  Supervisor IV 1000BaseX (GBIC)         WS-X4515
3    18  1000BaseX (GBIC)                       WS-X4418-GB
4     6  1000BaseX (GBIC)                       WS-X4306-GB
5    34  10/100BaseTX (RJ45), 1000BaseX (GBIC)  WS-X4232-GB-RJ
6    48  10/100BaseTX (RJ45)                    WS-X4148-RJ
7    48  10/100/1000BaseT (RJ45)                WS-X4548-GB-RJ45

Example on interface G7/3, counter clear 1 hour 36 minutes:

GigabitEthernet7/3 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 0021.d894.d1d2 (bia 0021.d894.d1
d2)
  Description: VMWARE5A.AT1
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is on, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
  Last clearing of "show interface" counters 01:36:32
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 17163
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 338000 bits/sec, 175 packets/sec
  5 minute output rate 758000 bits/sec, 256 packets/sec
     1056176 packets input, 256376196 bytes, 0 no buffer
     Received 11824 broadcasts (11572 multicasts)
    0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     1693482 packets output, 683221392 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 output buffer failures, 0 output buffers swapped out

Thank you by advance

Hervé

Hi Herve,

As per the interface logs output drops is more genrally  output drops appear whenever system is attempting to hand off a packet to the transmit buffer but no buffers are available. This can happen due to improper queuing done. You can increse output hold queue ( hold-queu out ) interface config command to increae the queue size.

http://www.cisco.com/en/US/partner/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml#drops

Hope to Help !!

Ganesh.H

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