From: Stathis Atmatzidis (Stathis.Atmatzidis@eurodyn.com)
Date: Fri Oct 11 2002 - 10:16:36 GMT-3
Hi Dave,
Problem I
=========
Basically you are describing the correct operation of OSPF over NBMA
network.
In a NBMA environment the OSPF configuration on the hub router needs the
neighbor configured for the spoke routers.
Furthermore in your config, since the hub router is configured with a
multipoint subinterface, the OSPF protocol treats that subinterface as a
NBMA connection. So the OSPF timers for this are: Hello 30, Dead 120,
Wait 120.
On the other hand the spoke routers are configured with p-2-p
subinterfaces. So these p2p subinterfaces are having the following
timers under OSPF Hello 10, Dead 40, Wait 40.
So apart from the neighbor command under hub router you should also
change the ip ospf network type under the two subinterfaces of the spoke
routers, in order to form adjacency with the hub router.
So your conclusion is correct. We should have hub=NBMA && spoke(s)=NBMA.
Problem II
==========
Again, this is a normal operation.
The connectivity through Frame relay network (every router pings the
others), has nothing to do with the OSPF adjacency. The network
connectivity is the first step in order to form an adjacency but routers
should have the correct OSPF timers values. By adding the neighbor on
the spoke routers does not help in this case. Neighbor should be added
only on the hub router PLUS the interfaces have to be of the same OSPF
type, in order to form an adjacency.
Hope this helps
Stathis
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