[c-nsp] FIB insertion issues on Sup2T routers

[Paul]

Seems to be a bug in many versions of code, we've had it happen on 
numerous sup2t devices, different random line cards and code versions 
all the way from the original sup2t codetrain up until SY5.

It seems to MOSTLY happen on 6908XL modules that I can tell. One router 
it happened after many years uptime. I suspect it's something going on 
with BGP injections lately on the internet, most definitely not reaching 
the capacity of the device but rather data contained inside could be 
giving false positives (a bug!).

Upgraded to SY10 and haven't seen it since, but that doesn't mean it's 
not still there.

Never had it happen on non-XL, and never had it happen on the 
Superivisor 2t itself, only the line cards. Already pinged cisco about 
it with no avail, even asked to simply put in a "if tcam exception 
happens on a line card (and only that card), reboot that line card 
automatically" option , but you know how they are.

Hoping that it was fixed in SY10+ (some caveats related to 6908 listed 
there that are similar in nature to this)


On 1/2/2018 9:11 AM, Jeroen van Ingen wrote:
> Hi,
>
> Never feels good when you can't find a good explanation / do proper 
> RCA for an incident...
>
> And you don't have any active support on the boxes? If you hit it 
> again, let us know; we're running a couple of Sup2T-XL too.
>
> Regards,
>
> Jeroen van Ingen
> ICT Service Centre
> University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
>
>
> On 02-01-18 14:51, "Rolf Hanßen" wrote:
>> Hello,
>>
>> on router #1 it happened again.
>> We then updated it to 15.2(1)SY5 (put luck) on Dec 6th and configured
>> prefix limits on all sessions allowing less tha 100k above current 
>> count.
>>
>> On router #2 we did nothing.
>>
>> Router #3 was false positive, issue did not occur at all (human error).
>>
>> Nothing happened since the updates, no insertion issue, no prefix 
>> count hit.
>> So we have no clue what happened.
>>
>> kind regards
>> Rolf
>>
>>> Hi,
>>>
>>>> I had 3 incidents within a week in which Sup2T-XL routers switched to
>>>> software forwarding.
>>>>
>>>> I.e. log says:
>>>> %MLSCEF-4-FIB_TCAM_INSERT_FAIL: FIB entry insertion into tcam failed,
>>>> one
>>>> IPv4 route may be absent from hardware table
>>>
>>> Haven't seen this one, but I'm interested to hear whether you've had 
>>> new
>>> occurrences... We're running newer code though, 15.2(1)SY5 currently,
>>> because of several bugs in earlier releases.
>>>
>>>
>>> Regards,
>>>
>>> Jeroen van Ingen
>>> ICT Service Centre
>>> University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
>>>
>>
>>
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/