From: Angelo De Guzman (ghie_pogi@yahoo.com)
Date: Sat Oct 26 2002 - 05:49:51 GMT-3
Hi,
Neighbor relationship are established and maintained
through the exchange of Hello packets. On broadcast
and p2p network types, hellos are multicast to
ALLSPFRouters(224.0.0.5). On NBMA, pt-to-multipoint,
and virtual link network types, hellos are unicast to
individual neighbors. The implication of unicasting is
that the router must first learn of the existence of
its neighbors either through manual configuration or
underlying mechanism such as inverse arp. jeff doyle
Since your ospf network type is non-broadcast. You
have to use neighbor command to so that adjacency can
be formed. Maybe there's another way to do this but I
don't know.
Hope this helps,
Angelo
--- Hunt Lee <ciscoforme3@yahoo.com.au> wrote:
> Guys,
>
> I'm sure this question has been asked many times
> before, but can
> someone kindly explain to me again? I have 3
> routers in a hub & spoke
> topology (same IP subnet), if on the spokes I don't
> want to add extra
> frame-relay map statements to point to other spokes,
> is using ospf
> network type "point-to-multipoint" on all 3 routers
> the only way to
> achieve this?? (since point-to-multipoint OSPF
> network type is the only
> one which will inject a /32 routes for each
> individual link in the hub
> & spoke topology).
>
> One more question... sorry =( Can anyone please
> also explain to me
> why would one want to use "ip ospf network
> <non-broadcast>" or "ip ospf
> network <point-to-multipoint> non-broadcast" ?? For
> both commands, I
> need to use the " neighbor x.x.x.x " on either the
> hub to point to all
> the spokes, or on each of the spokes pointing back
> to the hub to get it
> to work. So if I need to use the "neighbor"
> command anyway, what's
> the usage / function for those two commands??
>
> Thanks in advance,
>
> Hunt
>
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