[nsp] 12.2 - input queue stuck?

[Jens S Andersen]

I've experienced the same on a cisco2691 running ios 12.3(1a)

It stops receiving packets, including cdp adjacency. show controller fax/y
shows packets dropped.

It always happens when there is an overload condition on the customer network,
usually caused by infected PC's.

Clearing the cause of the overload followed by a shut/no shut on the interface
gets the interface going again.

(until the the next time...)

-Jens S Andersen

>one of our customers had just two of their boxes locked up

>on some of the fasteths the interfaces were ignoring input packets, but
>output traffic went like charm

>'sh int told like'

>  Input queue: 0/75/2902/13 (size/max/drops/flushes); Total output
>drops: 258
>  Queueing strategy: fifo
>  Output queue :0/40 (size/max)
>  30 second input rate 0 bits/sec, 0 packets/sec
>  30 second output rate 1000 bits/sec, 1 packets/sec


>while the switch where the box is connected was showing about 6 megs
>offered to the box.

>this, however, does not seem to be related to the advisory that was
>released about half an year ago as input queue would have to show 76/75


>rebooting the box solved the problem of course



>any hints please?


>thanks

>--
 
>Tomas Daniska
>systems engineer
>Tronet Computer Networks
>Plynarenska 5, 829 75 Bratislava, Slovakia
>tel: +421 2 58224111, fax: +421 2 58224199
 
>A transistor protected by a fast-acting fuse will protect the fuse by
>blowing first.



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Jens S Andersen                 Email:  jsa at aua.auc.dk
Aalborg University              Telf:   9635 9464
Fredrik Bajers Vej 5            Fax:    9815 6970
9220 Aalborg
Denmark