[c-nsp] ASR9k LC fib programming problem

[Jason Lixfeld]

We were told that in the ribd restart case it would be service impacting. Perhaps that's just TAC's default answer to save face.  In either case, we're just going to upgrade instead, and kill both birds with one stone. 

Sent from my iPhone

> On Jul 14, 2017, at 11:25 AM, James Bensley <jwbensley at gmail.com> wrote:
> 
> On 13 July 2017 at 16:02, Šturmankin Miroslav
> <miroslav.sturmankin at swan.sk> wrote:
>> router specifications:
>> ASR9006 IOS XR 4.3.4 SP4
>> A9K-RSP-4G
>> A9K-MOD160-TR + A9K-MPA-8X10GE & A9K-MPA-4X10GE
> 
> That is a an old IOS-XR version which I urge you to upgrade from, it's
> full of bugs, as you can see, I suggest you upgrade and the problem
> with probably go away.
> 
> Have you tried to restart the IPV4 RIB process? "process restart ipv4_rib"
> 
> That should cause the route to be re-downloaded to the card when the
> process restarts without a forwarding interruption. It won't clear
> routes from the card but when the process starts up again it will
> check what is on the card vs. what is in the central FIB and reprogram
> any miss-matches. We had a race condition on 4.3.4 [default through to
> SP4] with Inter-AS L3VPN routes not being programmed into the line
> card when there was a next-hop change, restarting that process
> sometimes fixed the problem.
> 
> If you route is also a labelled entriy you can try "process restart
> mpls_lsd" which will have same affect as above, if the label is wrong
> in a route when the process starts up again it should re-program the
> route into the line card.
> 
> You said you have cleared the route from the line card but that didn't
> worked, can you arrange a maintenance window and clear the entire CEF
> table on the card? "clear cef linecard location 0/1/CPU0" that will
> cause a "blip" outage as all routes are dropped from the card and then
> re-programmed.
> 
> Really though, in my opinion, an XR upgrade is needed here as the long term fix.
> 
> Cheers,
> James.
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