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Interface errors on 3560 interface

Half-duplex, 10Mb/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 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:32:32

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

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

7694 packets input, 1060476 bytes, 0 no buffer

Received 0 broadcasts (424 IP multicasts)

0 runts, 0 giants, 0 throttles

39 input errors, 39 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 460 multicast, 0 pause input

0 input packets with dribble condition detected

8377 packets output, 1194833 bytes, 0 underruns

0 output errors, 27 collisions, 0 interface resets

0 babbles, 10 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards

Gi0/20 0 40 0 40 0 0

Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants

Gi0/20 17 14 13 0 0 0 0

this is connected to a 10mb ethernet link. so it is common to see collision errors or late collsion but not sure about the input errors or CRC.

both sides are setup to auto negotiate on the duplex and speed. is it best to hardcode the speed to 100full and duplex half?

3560 is connected to a 6509.


Re: Interface errors on 3560 interface

CRC errors are mainly caused by duplex mismatch, bad cables, faulty switch ports, or NIC software/hardware issues. You should definitively start by hardcoding (downtime to avoid problems) and if problem persist, try to use a different cable and afterwards a different port.


Re: Interface errors on 3560 interface

you should be able to hardcode the speed/duplex to the maximum that both support.

at least 100/full should be supported on both.

Re: Interface errors on 3560 interface

the circuit is only 10mb ethernet. and on the 6500 the interface is gig and also the 3560 interface is gig. the port settings on both sides is auto/auto but are negotiating on 10mb/half duplex.

when i hardcode the interfaces to 100MB / full duplex, port appears down!

are CRC's error normal when receiving late collision?

New Member

Re: Interface errors on 3560 interface

As you mentioned the circuit is 10mb ethernet. Is it half-duplex or full, if it is full-duplex try to config 3560 or 6500 interface to 10mb full-duplex.