[nsp] 12.2(12a) & fe/dot1q/decef/mpls

[Jared Mauch]

On Wed, Dec 04, 2002 at 05:05:54PM +0100, Tomas Daniska wrote:
> 
> hi there,
> 
> 
> we're experiencing lots of input drops when the 7500 receives a packet
> on a dot1q subinterface that has to be switched on another subinterface
> of the same fe port. the following are the conditions:
> 
> - 7500, 12.2(anything) with decef & mpls enabled
> - egress interface is a vrf interface (the 7500 is a PE)
> - fifo queueing
> 
> 'sh int' vip reports the packets as ignored, rsp reports them as in-q
> drops. 'sh int switching' shows them as route processor drops
> 
> if i turn off decef on the interface (no ip route-cache distributed)
> everything works great. if i setup some other queueing (priority, cbwfq)
> the drop rate decreases (about tenfold) but still occurs
> 
> 
> this occurs even with minimum traffic loads (ones of kpps), drop rate is
> about 5-10%. i can safely reproduce this with a simple mpls vpn scenario
> 
> 
> 
> has anyone experienced this, too?

	do you have

	'ip route-cache same-interface' on the main FE interface?

	- Jared

> 
> 
> 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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-- 
Jared Mauch  | pgp key available via finger from jared@puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.