[nsp] High CPU utilization from traffic with no destination interface?

[rpcbind at speakeasy.net]

Are you running CEF? If so, then there's an implicit adjaceny to the null 
interface, so it should be handled extremely inexpensively. What does a 'show 
ip int' of the ingress interface show -- any chance there's some features 
there that may have tickled things badly?


On Thu, 26 Jun 2003, Temkin, David wrote:

> Does anyone know the actual IOS architecture for handling packets that enter
> the router where the router doesn't have a route for them?
> 
> I had a situation where a large amount of traffic was directed at one of my
> routers that didn't have a route to the destination and the CPU was pegged
> at 99%...  When I added an ACL blocking traffic to the networks that I
> didn't have routes to, the utilization dropped dramatically.
> 
> Thanks,
> 
> -Dave
> 
> 
> David Temkin
> S-I-G
> 401 City Avenue
> Bala Cynwyd, PA 19004
> http://www.sig.com <http://www.sig.com> 
> 
> 
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