[c-nsp] re-advertising eBGP learned prefixes

Michael Chomicz michael.chomicz at gmail.com
Mon Oct 24 04:40:04 EDT 2011


hi andrey - not sure if you've resolved your issue - you showed 2 BGP paths
in 2 different routers right? (both are called 'spring' and are in AS
65036??)

route that works (from the OTHER router):

> spring#sh ip bgp 10.36.72.32
> BGP routing table entry for 10.36.72.32/27, version 603507
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
>   Advertised to update-groups:
>      1
>   21017 44237 30835, (received & used)
>     10.36.2.22 (metric 3072) from 213.129.126.1 (10.36.1.1)
>       Origin incomplete, metric 0, localpref 100, valid, internal, best
>       Originator: 10.36.1.4, Cluster list: 10.36.1.1

my confusion here is : the AS you're trying to advertise 10.36.72.32/27 to
is AS 21017?? ... based on this AS path (of this other 'spring' router - it
looks like it is already coming from AS 21017 into AS 65036 - so i'm
thinking that AS 21017 already has the route through a shorter path (AS
44237)

who is in update-group 1? (sh ip bgp update-group 1)

i think a clearer picture/re-investigation of the BGP topology would bring
some results - especially if the filters are having no effect


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