[j-nsp] Hidden iBGP Route if OSPF no-summaries is configured

Benny Sumitro benny.sumitro at gmail.com
Mon May 10 22:53:26 EDT 2010


Hi,

If you are using no-summaries command, you basically denied all summary LSA
from other regions. Since you need to resolve next-hop reachability in the
BGP routes (advertising router), you need to have advertising router
reachable from your router.

>From above output, route 10.200.0.0/16 is advertised from 10.200.11.1.
Router 10.200.11.1 cannot be resolved by default route (which i understand
you are trying to do) since 10.200.0.0/16 is more specific and it cannot be
used as next hop resolution since it will create a recursive look-up (
10.200.0.0/16 is reachable via 10.200.11.1 while 10.200.11.1 is resolved by
10.200.0.0/16, etc).

Either allow summary LSA of 10.200.11.1 in your area or use a static route.
Other approach may be applicable depends on your network.

Cheers,
Benny


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