[c-nsp] ttl-failure

[Phil Mayers]

On Wed, 2007-11-14 at 14:58 +0100, saso pirnat wrote:
> I'm experiencing problems that are seen specialy on multicast traffic
> (about 200Mb/s) on one of our 7609-2SUP720XL-2PS with WS-SUP720-3BXL and
> WS-X6748-SFP line card running s72033-adventerprisek9_wan-mz.122-18.SXF8
> due high CPU utilization on IP and TAG input. I can avoid this with mls
> rate-limit all ttl-failure. On mls statistic I see there is about
> 3000 - 6000 errors with ttl-failure per second on this router, while on
> other routers there is about 100 - 200  errors. Does anybody have idea
> how to identify and eliminate this errors.

You could use SPAN/RSPAN/ERSPAN to mirror traffic punted to the RP, and
see what the source is:

http://cisco.cluepon.net/index.php/6500_SPAN_the_RP