From: Thomas Larus (tlarus@xxxxxxx)
Date: Sun Jan 06 2002 - 17:49:50 GMT-3
1) Does anyone care to share some general guidance about what networks
should be advertised using the network statement? I used to use too
many network statements in my practice labs. In a recent lab, I took
out a bunch of network statement, so I would only advertise networks
that the instructions say need to be advertised to other ASs (Hutnik
and Staterlee Lab 1), but I found that sometimes it was useful to
advertise some of the transit routes.
2) On a related note, in that same BGP scenario there are a bunch of BGP
peers sharing a VLAN on a switch, (kind of like they might in the real
world at an exchange point). The problem is that each AS likes to tell
each other AS that you can reach a particular route by using a next-hop
address in that other AS over there. That is fine, since the next-hop
address is correct, but still it creates a BGP route including the AS
number of the router that says, Hey, you can reach that route by the
next-hop over there in the next AS. The routing table correctly
installs the route with the shorter as-path, but it still make the BGP
table look weird. Is this correct, or should I be using a route-map to
filter these useless advertisement from AS that are not truly transit
Ass?
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