[c-nsp] Catalyst 6500 switchport input drops

[Dale W. Carder]

What's the spanning-tree state of that port (for all vlans
on that port), DTP, CDP, etc?

input queue drops on L2 ports is poorly documented (if at
all).  I have guessed that they indicate bpdu's being
thrown away or other such stuff.

Dale

----------------------------------
Dale W. Carder - Network Engineer
University of Wisconsin at Madison
http://net.doit.wisc.edu/~dwcarder


On Apr 23, 2007, at 12:21 PM, Matt Ryan wrote:

> Seeing a large number of drops on a switchport interface without  
> any obvious
> reason (no errors, buffer misses, CPU load etc):
>
> Router#sh int fa2/2
> FastEthernet2/2 is up, line protocol is up (connected)
>   Hardware is C6k 100Mb 802.3, address is 0004.de84.1431 (bia  
> 0004.de84.1431
> )
>   MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
>      reliability 255/255, txload 1/255, rxload 1/255
>   Encapsulation ARPA, loopback not set
>   Keepalive set (10 sec)
>   Full-duplex, 100Mb/s
>   input flow-control is off, output flow-control is unsupported
>   ARP type: ARPA, ARP Timeout 04:00:00
>   Last input never, output 18w2d, output hang never
>   Last clearing of "show interface" counters never
>   Input queue: 0/2000/1158238/0 (size/max/drops/flushes); Total output
> drops: 0
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   5 minute input rate 128000 bits/sec, 113 packets/sec
>   5 minute output rate 2000 bits/sec, 2 packets/sec
>      943186717 packets input, 180091004357 bytes, 0 no buffer
>      Received 126945712 broadcasts (22133563 multicasts)
>      0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>      0 watchdog, 0 multicast, 0 pause input
>      0 input packets with dribble condition detected
>      47163411 packets output, 7169043006 bytes, 0 underruns
>      0 output errors, 0 collisions, 4 interface resets
>      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
>
> Router#sh int fa2/2 counters errors
>
> Port        Align-Err    FCS-Err   Xmit-Err    Rcv-Err UnderSize  
> OutDiscards
> Fa2/2               0          0          0          0          
> 0           0
>
> Port      Single-Col Multi-Col  Late-Col Excess-Col Carri-Sen      
> Runts
> Giants
> Fa2/2              0         0         0          0         0
> 0         0
>
> Port       SQETest-Err Deferred-Tx IntMacTx-Err IntMacRx-Err Symbol- 
> Err
> Fa2/2                0           0            0             
> 0          0
>
> Any idea's what else to look for?
>
>
>
> Matt.
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