OSPF uses a router ID in it's advertisements to other neighbors.
The router id is simply the highest IP address of a loopback if you
have them configured and if not then the highest IP of an active
interface. I don't think it's a reachability type question - the
neighbors certainly need to be able to talk to each other and learn
about the topology - but the addresses they use to send traffic can
be different than the IP used in the router id.
Ian
http://www.ccie4u.com
Rack Rentals and Lab Scenarios
On 25 Mar 2003 at 4:24, XY HIEN LE wrote:
> Hi all,
>
> Two routing protocols: OSPF and EIGRP DO need to have their own router
> ID reachable by other routers to have proper network connectivity, or am
> I incorrect?
>
> Any confirmation on this is much appreciated.
>
> Xy
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