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Beginner

Interface discards

Hi,

Need some help figuring out what is causing the interface discards and how to solve this behaviour.

Thanks in advance.

Key points:

1: No QoS on the switch

2: This switch only passes multicast traffic to a cat4500

Interfce config:

interface GigabitEthernet1/0/49

description => SECURITY

switchport trunk allowed vlan 8,9

switchport mode trunk

channel-group 1 mode active

interface Port-channel1

description => SECURITY

switchport trunk allowed vlan 8,9

switchport mode trunk

Interface stats:

SW2#sh int g1/0/49

GigabitEthernet1/0/49 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 64ae.0c75.29b1 (bia 64ae.0c75.29b1)

  Description: => SECURITY

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 19/255, rxload 2/255

  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 00:00:11, 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: 4999376

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 10112000 bits/sec, 1042 packets/sec

  5 minute output rate 78275000 bits/sec, 7163 packets/sec

     19677030336 packets input, 25263816548777 bytes, 0 no buffer

     Received 1875561822 broadcasts (1831799088 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 1831799088 multicast, 0 pause input

     0 input packets with dribble condition detected

     146563144209 packets output, 199802264781424 bytes, 0 underruns

     0 output errors, 0 collisions, 1 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

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
Enthusiast

Interface discards

You may be hitting the bug  CSCtq86186

Run this command constantly for 5-10 times and you will see different (bogus) values of output drops and if so, upgrade to 15.0.2. I did the upgrade and it went away. Please rate the helpful post.

sh int g1/0/49 | i output drops

View solution in original post

3 REPLIES 3
Beginner

Interface discards

More stats.

Enthusiast

Interface discards

You may be hitting the bug  CSCtq86186

Run this command constantly for 5-10 times and you will see different (bogus) values of output drops and if so, upgrade to 15.0.2. I did the upgrade and it went away. Please rate the helpful post.

sh int g1/0/49 | i output drops

View solution in original post

Beginner

Interface discards

Thanks Nawas,

I had upgraded a couple of switches 2 weeks ago for another reason and they are not reporting the bogus drops as they used too.

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