[c-nsp] IBGP route stays stuck

[Pete Lumbis]

Do you happen to have the output of the BGP tables (specifically the
a.b.c.d route) from PE1 and PE2 during the failure? My guess is that it's
"expected" (in the sense BGP is doing what it's supposed to, even if
undesired) and seeing it in the broken state should make it easy to reverse
engineer why it happens.

-Pete

On Thu, Oct 23, 2014 at 9:59 AM, Pasquino Andrea <andrea.pasquino at eng.it>
wrote:

> Pete,
>
> Actually the floating static on PE2 is redistributed  with weight 0 by
> default.
> I have configured on PE2 a route-map in order to redistribute into BGP the
> routes coming from MPBGP with a higher weight, no luck. I think I’m going
> to check with TAC…
>
> Andrea
>
> From: Pete Lumbis [mailto:alumbis at gmail.com]
> Sent: mercoledì 22 ottobre 2014 15:44
> To: Pasquino Andrea
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] IBGP route stays stuck
>
> Perhaps when the floating static kicks in on PE2 the weight will be 32768,
> most likely making it the best route in the BGP table, causing it to
> advertise to PE1? I've seen similar configurations run into this. If this
> is your issue the solution is a route-map on the redistribution statement
> setting the weight to 0
>
> On Wed, Oct 22, 2014 at 2:30 AM, Pasquino Andrea <andrea.pasquino at eng.it
> <mailto:andrea.pasquino at eng.it>> wrote:
> Hello,
>
> This is the scenario:
>
> I have PE1 and PE2 in AS100
> PE1 has an EBGP peering with AS200 and receives a certain prefix a.b.c.d
> with LP=222
> The same prefix a.b.c.d is redistributed on PE2 with LP=33 from a floating
> static route, and serves as a back-up route
>
> Now here's what happens: if for some reason AS200 stops announcing prefix
> a.b.c.d, then the announcement from PE2 kicks and we are happy (back-up
> runs fine)
>
> When  AS200 starts again announcing prefix a.b.c.d, then the announcement
> from PE2 does not get flushed from PE1 and PE2. We have to erase the "ip
> route vrf blahblah" command and rewrite it
>
> Have you any clues ?
>
> Andrea
>
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