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New Member

Understanding SHOW INTERFACE


One of our switches (WS-C3548-XL) in the server room is generating several errors on several interfaces. Here is one example:

FastEthernet0/2 is up, line protocol is up

Hardware is Fast Ethernet, address is 0002.166b.b342 (bia 0002.166b.b342)

Description: ***ACCESS PORT***

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not set

Auto-duplex (Full), Auto Speed (100), 100BaseTX/FX

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

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

Last clearing of "show interface" counters 15:39:55

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 7000 bits/sec, 5 packets/sec

5 minute output rate 83000 bits/sec, 28 packets/sec

2353394 packets input, 420873627 bytes

Received 378 broadcasts, 0 runts, 0 giants, 0 throttles

1070 input errors, 1070 CRC, 0 frame, 4352 overrun, 4352 ignored

0 watchdog, 0 multicast

0 input packets with dribble condition detected

3550965 packets output, 1053192180 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

Where do I get information what could be causing the overruns, input errors, CRCs, etc.?

Regards, LLS71


Re: Understanding SHOW INTERFACE

Check the server nics to see how they are set . The switch is set for auto speed and duplex so the server nics must also be set for auto speed and duplex , they "cannot" be hardcoded to a specific speed and duplex unless you hardcode the switch also.

New Member

Re: Understanding SHOW INTERFACE

Do you know where I can get detailed information about the errors (overrun, etc.)?

Regards, L. Schieder

Cisco Employee

Re: Understanding SHOW INTERFACE

This link should help in uderstanding and troubleshooting the same.

HTH,Please rate if it does.

-amit singh