RE: ospf network type non-broadcast

From: Chuck Ryan (chryan) (chryan@cisco.com)
Date: Fri May 16 2008 - 08:33:41 ART

Hi Hong,

I dont have any problem establishing adjacencies with or without the
neighbor statements configured under the ospf routing process. That is
what I don't understand. I thought with a network type of non-broadcast,
you have to manually define your neighbors on your DR in order to
establish adjacencies. As it turns out for me, that's not the case. I
can establish ospf adjacencies with the neighbor statements AND without
the neighbor statements.

I'm trying to find out why this works with no neighbor statements
configured, and no broadcast statement at the end of my frame-relay map
statements.

Thanks,

Chuck

________________________________

From: Hong Chan [mailto:howard.chan34@gmail.com]
Sent: Friday, May 16, 2008 12:50 AM
To: Chuck Ryan (chryan)
Subject: Re: ospf network type non-broadcast

Where is your DR? Is that on the r1?
Try to add "ip ospf priority 0" on r2 & r3, add neighbor statement on
r1. If still not able to form neighborship, try debug to see how's the
hello packet talking.

2008/5/16 Chuck Ryan (chryan) <chryan@cisco.com>:

        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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