[c-nsp] 7600 RSP720 SRD4 bgp bounce triggers cpu exhaustion

[Nick Hilliard]

On 31/10/2011 21:53, Steven Raymond wrote:
> What could cause IP input to be so high?

this can be caused by routing loops which happen because the RIB gets out
of date with respect to the rest of the network.  This will result in lots
of icmp ttl-expired packets to be generated by the RP, which will cause IP
Input to get excited.  Try configuring the following:

mls rate-limit all ttl-failure <xxx>
mls rate-limit all mtu-failure <xxx>
mls rate-limit unicast ip icmp redirect <xxx>
mls rate-limit unicast ip icmp unreachable <xxx>

If you already have lots of other mls rate limiters configured, you may
need to be careful when configuring these, because there are more mls rate
limiter options than the hardware is capable of supporting at the same time.

Nick