Input errors trunk interface catalyst 4500

alfonso.cornejo · ‎11-25-2008

Hi to all!

I'm having alot of input errors in a Gigabit interface of a catalyst 4500, it is configured as trunk an connected to a catalyst 2960G, in the interface of the 2960G are not any input errors just in the 4500, we already replace the cable between the devices but the situation remains.

CORE1#sh int gi7/45

GigabitEthernet7/45 is up, line protocol is up (connected)

Â Hardware is Gigabit Ethernet Port, address is 001b.d403.ffcc (bia 001b.d403.ffcc)

Â Description: Trunk SERVERS2-2 0/47

Â MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

Â Â Â Â reliability 255/255, txload 14/255, rxload 2/255

Â Encapsulation ARPA, loopback not set

Â Keepalive set (10 sec)

Â Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX

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

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

Â Last input 00:00:16, output never, output hang never

Â Last clearing of "show interface" counters 4d16h

Â Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Â Queueing strategy: fifo

Â Output queue: 0/40 (size/max)

Â 5 minute input rate 10877000 bits/sec, 2163 packets/sec

Â 5 minute output rate 56541000 bits/sec, 5627 packets/sec

Â Â Â Â 953098496 packets input, 1206543544279 bytes, 0 no buffer

Â Â Â Â Received 664857 broadcasts (354055 multicast)

Â Â Â Â 0 runts, 0 giants, 0 throttles

Â Â Â Â 401342 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

Â Â Â Â 0 input packets with dribble condition detected

Â Â Â Â 477363643 packets output, 169391220601 bytes, 0 underruns

Â Â Â Â 0 output errors, 0 collisions, 0 interface resets

Â Â Â Â 0 babbles, 0 late collision, 0 deferred

Â Â Â Â 0 lost carrier, 0 no carrier

Â Â Â Â 0 output buffer failures, 0 output buffers swapped out

Here is the configuration of the two interfaces:

Catalyst 4500

interface GigabitEthernet7/45

description Trunk SERVERS2-2 0/47

switchport trunk encapsulation dot1q

switchport mode trunk

logging event link-status

Catalyst 2960

interface GigabitEthernet0/47

description Trunk CORE1 7/45

switchport mode trunk

media-type rj45

Do you have any idea of what could be causing the input errors?

Thanks in advance for your help.

Edison Ortiz · ‎11-25-2008

You may be running into oversubscribed ports in the 4500. Remember the 6Gbps threshold per module on this chassis.

Have you tried moving this connection to another switchport and/or module and see if you can duplicate it?

__

Edison.

alfonso.cornejo · ‎11-25-2008

Hi Edison,

I moved it to another switchport but not to another module, I'll try that tomorrow night and see what happen.

I'll post what happen.

Thanks

richardpierce · ‎08-13-2009

Hi,

I am experinecing the same problem, input errors only on the 4500 side of multiple links to core 6500s. Did you find a resolution to this?

Regards,

Richard.

alfonso.cornejo · ‎08-13-2009

Hi Richard,

The problem was that we were over the 6Gbps threshold per module on the 4500, we moved the connection to another module.

Hope this help.

Regards,

richardpierce · ‎08-14-2009

Hi,

How did you know you were over the 6Gbps threshold are there counters available to show this?

Regards,

alfonso.cornejo · ‎08-14-2009

Hi,

With a sh inter summary and manually add the RXBS and TXBS value from every interface on the module.

Regards,

jbrenesj · ‎08-13-2009

Quote:

"You may be running into oversubscribed ports in the 4500. Remember the 6Gbps threshold per module on this chassis."

I notice that there are no input/output drops on the interface so I doubt this is an oversubscription case.

What are those input errors??

I bet they are 1504 bytes dot1q frames.

Please paste a:

sh int gi7/45 counters all