On Thu, 5 Oct 2000, Kane, Christopher A. wrote:
> > 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?
The routes are most likely not in RouterB's table, because the routes
next-hop information is not reachable by routerB............
Brian
> >
> > Thanks,
> > Chris
>
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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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