[c-nsp] ASR920 stops routing unexpectedly

[Tassos Chatzithomaoglou]

If the following conditions are active just before the crash (you can run a script periodically for checking), then you're probably hitting our nasty bug.

1) output of "show platform hardware pp active asic debug 0 | in FIFO" is TRUE
2) hex counters of "show platform hardware pp active asic stat 0 | inc IncomingMissingSopCount" are increasing after consecutive command executions

All these and many more are described in the internal bug notes, but for obvious reasons are not included in the public description.

In any case, i would recommend upgrading to the recommended release immediately (keep an eye on the introduced l3vpn trace & mpls ping caveats) and skip all this tricky troubleshooting.
The whole case was a nightmare for us...

--
Tassos

James Jun wrote on 11/5/16 16:24:
> Hi Eric,
>
> On Wed, May 11, 2016 at 05:48:17AM -0400, Eric Van Tol wrote:
>> I am now on my third day with TAC on this problem and they are driving me up a wall. I have an ASR-920-24SZ-M that has been in service for almost a year, on 3.15.0S running ISIS, BFD on one link, BGP, LDP, MPLS. Shortly after midnight this past Saturday, it stopped routing for no apparent reason. As we have it connected to an ethernet OOB network, I was able to get in it to take a look. 
> How much traffic was your A920 doing at the times when it went stopped forwarding traffic?
>
>> I'm running 3.15.0S, but don't want to upgrade without knowing what this is. I found this link to an old discussion: 
>>
>> http://www.gossamer-threads.com/lists/cisco/nsp/191739#191739
> I believe this is related to CSCux98051
>
> Symptom:
> Transit packet drops in the network with certain packet sequences
>
> Conditions:
> 1. Certain packet sequences
> 2. MPLS / VPLS configuration in the network. 
> 3. High traffic rate 
> 4. Combination of traffic streams with varying packet sizes
>
>
> James
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