[j-nsp] eBGP neighbor link failure detection

[Payam Chychi]

Are you sure? Ive never seen an update to remove routes take 3min. 

Andy, are you sure the 3min outage was  after the link hard down and not just prior? Guessing this is easy to find due to time stamps. Ive seen this due to line protocol down and everything blackholes until bgp fails but never a 3mim wait for route withdraw (unless this is a peering router with dozens of peers and full routes on each)

Hope you fins root cause 

-- 
Payam Chychi
Network Engineer / Security Specialist


On Thursday, March 13, 2014 at 4:50 PM, Andy Litzinger wrote:

> Hi Chris,
> yes, i am taking full routes from this neighbor.
> 
> is there any way to reduce the time it takes to handle the updates? if i
> wanted to test this behavior in my lab, what would i want to watch?
> (logs/traceoptions)
> 
> i don't think I've seen this behavior during scheduled maintenance- for
> example during times when i've deactivated the neighbor config. Am I
> correct in thinking this is because in this scenario even though the RE is
> taking awhile to remove the routes from the FIB the actual next hop router
> is still available and thus the routes are still valid?
> 
> -andy
> 
> 
> On Thu, Mar 13, 2014 at 3:54 PM, Chris Adams <cma at cmadams.net> wrote:
> 
> > Once upon a time, Andy Litzinger <andy.litzinger.lists at gmail.com> said:
> > > what surprised me is that it looks like routes toward that provider were
> > > not immediately removed from my routing table. Instead i see evidence of
> > > blackholing for almost 3 minutes.
> > > 
> > 
> > 
> > Are you taking full routes from this neighbor? It takes a while for the
> > routing engine to send updates to remove/replace 200k+ prefixes to the
> > forwarding engine.
> > 
> > --
> > Chris Adams <cma at cmadams.net>
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/juniper-nsp
> > 
> 
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