[c-nsp] Weird Traceroute Issue to Specific Destination

[Roger Wiklund]

Have you checked the Cisco bugtool for your hardware/IOS?

Regards
Roger

On Wed, Sep 22, 2010 at 11:20 AM, Paul Stewart <paul at paulstewart.org> wrote:
> We did reboot the equipment and no difference - it's also older sup2 based
> 6500 there....;)
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Phil Mayers
> Sent: September-22-10 3:40 AM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Weird Traceroute Issue to Specific Destination
>
> On 09/21/2010 08:48 PM, Paul Stewart wrote:
>> Ok... so here's the latest.
>>
>> I put a static route at our Internet edge - we redistribute static into
> OSPF
>> so now this /32 destination is able to be seen in the routing table (other
>> than the default originated route).  This solves the issue if I statically
>> assign it the next hop (which is their ISP that we peer directly with via
>> LINX exchange point).  I don't like this solution though because if there
>> was ever an issue with the static next-hop it would never fail over ...
> plus
>> I don't see *why* I should have to do this in order to find the problem ;)
>>
>> I pulled the static out and same problem re-occurs... any thoughts?
>
> That smells awfully like hardware FIB corruption. Have you / can you
> reload the box? Or get a TAC engineer on the line - I've had pretty good
> results with that; they usually ELAM the faulty traffic, then inspect
> the ELAM headers to tell them what FIB entry is really matching the
> traffic, then work from there. Slow process, though...
>
> Actually clearing FIB corruption on the PFC3 platform seems to be
> tricky; the things you think would work (clear ...) never seem to. I've
> only ever managed to clear it by "shut/no shut" of the suspect SVIs, and
> even then only some of the time.
>
> (We've seen 4-5 FIB corruption issues on sup720 w/ recent IOSes, on
> different routers)
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