[c-nsp] Forcing BGP to propagate only after route is in the FIB

[John East]

On Wed, Sep 14, 2016 at 8:03 PM, Octavio Alvarez <octalcnsp at alvarezp.org>
wrote:

> Hello.
>
> We are noticing our ASR 1002 is propagating BGP-learned routes to its
> neighbors after the path is chosen but before the route gets installed
> in the FIB.
>
> With the increasing size of the BGP table, this is causing race
> conditions that turn into traffic loops during convergence. The router
> attracts traffic but returns it back to somebody else because the route
> is not yet in the FIB or it is outdated in the FIB.
>
> Is there a way to force the router to wait until a route is installed
> all the way in the FIB before having it propagated to the neighbors?
>
> Thanks.
> _______________________________________________
>

I've had to engineer around this, as we had 4 ASR1002s taking in full
routes from several providers and ran into this very issue.  This also was
a catalyst to replace them with ASR9001s at the edge.  It seems like a flaw
in the ASR1000 series.

John