From: Wade Edwards (wade.edwards@xxxxxxxxxxxxxxxxxxx)
Date: Fri Feb 22 2002 - 17:04:52 GMT-3
The OSPF RID has the format of an IP address but does not have to be an
IP address of an interface on that router. If you configure a RID of
6.6.6.6, that address will NOT be pingable since it does not appear in
the routing table but, it does need to be unique in the OSPF network.
Cisco chooses the highest IP address of an addressed interface
configured on the router for the RID because it is the easiest way to
ensure its uniqueness in the network. I personally like to set the RID
on my OSPF routers so that if an interface goes down it will not change
the routers OSPF RID and break any virtual-links previously configured.
To answer your question about setting the virtual-link to an interface
IP address on the router instead of the OSPF RID, the answer is NO. It
MUST be the RID.
HTH L8r.
-----Original Message-----
From: Przemyslaw Karwasiecki [mailto:karwas@ifxcorp.com]
Sent: Friday, February 22, 2002 1:12 PM
To: ccielab@groupstudy.com
Subject: OSPF virtual links
Group,
Simple question:
Is it possible to create virtual link (connect virtual areas)
using interface address instead of OSPF router ID?
Cisco documentation says:
area <area-id> virtual-link <router-id>
Obviously, using RID is better for stability reasons,
but one can imagine hyphothetical situation when OSPF RID
is not in routing table, so it would not be reachable for
virtual-link.
Comments?
Thanks,
Przemek
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