[c-nsp] Deferred packets on 2950 10/full interface

[Michael K. Smith]

On 1/14/05 2:25 PM, "Clinton Work" <clinton at scripty.com> wrote:

> 
> I'm seeing 3716 deferred frames on a 10/full interface. I suspect a
> duplex mismatch even though the Telco assures me that their interface is
> 10/full as well. Anybody seen this problem on another 2950 switch?
> 
> 
> Router#show int fa0/1
> FastEthernet0/1 is up, line protocol is up (connected)
>    Hardware is Fast Ethernet, address is 000e.38a0.3901 (bia 000e.38a0.3901)
>    Description:
>    MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
>       reliability 255/255, txload 1/255, rxload 1/255
>    Encapsulation ARPA, loopback not set
>    Keepalive set (10 sec)
>    Full-duplex, 10Mb/s
>    input flow-control is off, output flow-control is off
>    ARP type: ARPA, ARP Timeout 04:00:00
>    Last input 00:00:00, output 00:00:05, output hang never
>    Last clearing of "show interface" counters 6w0d
>    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
>    Queueing strategy: fifo
>    Output queue :0/40 (size/max)
>    30 second input rate 0 bits/sec, 0 packets/sec
>    30 second ouxtput rate 0 bits/sec, 0 packets/sec
>       2979697 packets input, 477032533 bytes, 0 no buffer
>       Received 2612753 broadcasts, 241 runts, 0 giants, 0 throttles
>       316 input errors, 0 CRC, 75 frame, 0 overrun, 0 ignored
>       0 watchdog, 2612346 multicast, 0 pause input
>       0 input packets with dribble condition detected
>       1110744 packets output, 296966944 bytes, 0 underruns
>       0 output errors, 0 collisions, 0 interface resets
>       0 babbles, 0 late collision, 3716 deferred
>       0 lost carrier, 0 no carrier, 0 PAUSE output
>       0 output buffer failures, 0 output buffers swapped out
> 
> IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(13)EA1, RELEASE
> SOFTWARE (fc1)
> Copyright (c) 1986-2003 by cisco Systems, Inc.
> Compiled Tue 04-Mar-03 02:14 by yenanh
> Image text-base: 0x80010000, data-base: 0x805A8000
> Model number: WS-C2950-12
> 
> 
I only say this for troubleshooting purposes.  I'm fairly certain you will
see duplex mismatch error messages in your log if you have CDP enabled (and
if you're logging, of course).  However, I would not recommend running CDP
after you determine if there is a mismatch.

Mike