high discard rate interface 2960 according to smarts

filipvanacker · ‎01-21-2014

hey,

I have the following issue , our monitoring device (smarts) says often that the treshhold of discard rate is exceeded (

.1.3.6.1.2.1.2.2.1.19

.1.3.6.1.2.1.2.2.1.13)

of the interfaces of 2960 ( WS-C2960S-48LPS-L 15.0(1)SE2 C2960S-UNIVERSALK9-M)

but I do not see may errors on the interfaces in question

any idea what it could be, a bug of somekind?

Amit Singh · ‎01-21-2014

Have a look at this.

https://supportforums.cisco.com/thread/2014402

Two most common reasons :

1. Speed/duplex mismatch

2. High traffic on the port causing the switch buffer run out.

Cheers,

-amit singh

filipvanacker · ‎01-21-2014

I am sorry but there is no duplex mismatch and also when a buffer is running out , should this not been seen in the stats of the interface?

GigabitEthernet1/0/48 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is c40a.cbd3.2130 (bia c40a.cbd3.2130)

Description: link 1 van 2 (Po-Ch 1) naar DL_BXL_A_CS01

MTU 1500 bytes, BW 1000000 Kbit/sec, 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, media type is 10/100/1000BaseTX

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:12, output 00:00:20, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 709

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1447000 bits/sec, 216 packets/sec

5 minute output rate 353000 bits/sec, 142 packets/sec

4835187198 packets input, 3467273375673 bytes, 0 no buffer

Received 189534354 broadcasts (18485326 multicasts)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 18485326 multicast, 0 pause input

0 input packets with dribble condition detected

4420530022 packets output, 2002468487131 bytes, 0 underruns

0 output errors, 0 collisions, 3 interface resets

0 unknown protocol drops

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

Leo Laohoo · ‎01-21-2014

Post the output to the command "sh controll e G1/0/48".

Another thing, your IOS is not recommended. Think about using either 12.2(55)SE8 or 15.0(2)SE4.

filipvanacker · ‎01-21-2014

sh controllers ethernet-controller gigabitEthernet 1/0/48

     Transmit GigabitEthernet1/0/48           Receive
   1265759827 Bytes                       2876227289 Bytes
    305248619 Unicast frames               301193112 Unicast frames
      2354520 Multicast frames               1841059 Multicast frames
       913338 Broadcast frames              20506992 Broadcast frames
            0 Too old frames              3751729039 Unicast bytes
            0 Deferred frames              314558942 Multicast bytes
            0 MTU exceeded frames         1850964379 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             2539828 Minimum size frames
            0 8 collision frames           102434188 65 to 127 byte frames
            0 9 collision frames            42835307 128 to 255 byte frames
            0 10 collision frames           17318346 256 to 511 byte frames
            0 11 collision frames           10718159 512 to 1023 byte frames
            0 12 collision frames            9311828 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          138383507 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
       177837 64 byte frames                       0 Valid frames, too small
    104134352 127 byte frames
     56157656 255 byte frames                      0 Too old frames
     20764539 511 byte frames                      0 Valid oversize frames
     11645014 1023 byte frames                     0 System FCS error frames
      4072065 1518 byte frames                     0 RxPortFifoFull drop frame
    111565014 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

see here the output,

why is the ios not recommended , it is still on the list of cisco downloads

Leo Laohoo · ‎01-22-2014

see here the output,

The output to the command "sh controll e" is clean. I don't see any issues here.

why is the ios not recommended

CPU and memory hog bugs.

filipvanacker · ‎01-23-2014

thx, but this is the issue , we don not see errors but still the snmp tool like smarts says there is a high discard rate, can it be a bug of some kind?