> i have a question about the bgp routing table.
>
> lab scenario:
> router A is a "branch" type router providing access to the network. router
> A is running bgp with router B, the "gateway" or "border" router to the
> network. i have router A setup to announce 2 /24's into the network via
> it's bgp connection with router "B". i have been playing with route-maps
> and having them call upon a prefix-list to accept or reject routes.
>
> what problem am i trying to solve:
> what i have found surprising is that router B accepts the network
> advertisements from router A and they show up in the bgp routing table. i
> can see the networks if i ask router B (sh ip bgp nei x.x.x.x
> received-routes). but the networks in question are not in router B's
> routing table (sh ip route x.x.x.x) one of my buddies suggests that my
> route-map/s or prefix-list/s could be incorrect. my argument is then why
> would router B even bother accepting the route announcements from router
> A. i would think that in the interest of saving memory, router B would
> simply drop the networks announced if they did not match the prefix-list
> that the route-map is calling upon.
>
> i don't need anyone to look at the configs. just looking for comments
> about the operation of the bgp routing. can anyone tell me if router B
> would accept these advertisements in it's table and not put them in the
> routing table because they don't match the requirements. i know that bgp
> will only place a "best" known route in the routing table but why even
> bother accepting the routes at all? Wouldn't that be contradictory to the
> idea of saving space/memory?
>
> Thanks,
> Chris
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