ospf network type non-broadcast

From: Chuck Ryan (chryan) (chryan@cisco.com)
Date: Fri May 16 2008 - 00:16:28 ART


Hi GS,

I have a question about the ospf network type, non-broadcast. In a
simple 3 router pod, with r1 being the hub and r2 and r3 being the
spokes, I've been reading how you need to configure a neighbor statement
under r1 in order to establish ospf adjacencies with r2 and r3.

When I lab it up and try it, it does work. What I have also found out,
is that no neighbor statement is necessary in order to get ospf
adjacencies up between r1 and r2, and r1 and r3. Frankly, I don't see
the difference whether I manually define neighbors or not, the results
appear to be the same.

Can someone explain this behavior? I thought that if you do not specify
the neighbor statement, then the adjacencies will not come up, but that
doesn't appear to be the case. Also, I am not using the "broadcast"
keyword on my frame-relay map statements.

Thanks,

Chuck



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