From: Howard C. Berkowitz (hcb@xxxxxxxxxxxx)
Date: Fri Feb 15 2002 - 14:22:30 GMT-3
>Mike:
>
>I like the condition you added, which is "routes eligible for the RIB". I
>think, you mean another routing source, which has lower adminstrative
>distance, didn't inject the same route into routing table.
>
>For ospf, when you say the routing bit set, do you mean the routes resulted
>from SPF, and also in the RIB? In other words, any route which does not
>exist in the routing table will not be redistributed?
That is definitely the case for BGP; it's part of loop prevention.
BGP will also not announce a route that has a next hop that cannot be
resolved in the RIB.
I don't know definitively if that's done in Cisco's IGPs, but, in
general, it is a basic principle of avoiding loops.
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