[nsp] A question regarding BGP next-hop reachability.

From: Elijah Kagan (elijah@netvision.net.il)
Date: Sun Jun 17 2001 - 04:23:47 EDT


Suppose there is a router (a Cisco router, of course) that learns nothing
but a default gateway from its IGP. It also has an iBGP session with its
default router and receives the full Internet routing table. The default
router acts as a route-reflector.

Now here is the problem. The next-hop of every BGP prefix it learns is
reachable via IGP's default gateway, but for some reason it is not good
enough, BGP marks it as inaccessible and disregards the prefix.

This situation could appear in L1 router that learns a prefix originating
form a different IS-IS area.

Please advise....

-- elijah



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