>Hello,
> I had heard a lot about using the loopback interface for router ID for
>OSPF, etc... because it never goes down. However, my question is about the
>addressing of this interface, and whether I can assign an IP from the same
>subnet to a loopback interface on a neighboring router, or I have to assign
>a separate subnet on each router?
Yes. I'm conservative, and will assign it a prefix no longer than /29
to avoid odd effects if a routing protocol makes assumptions about
point-to-point or hsot interfaces. /32 should work, but doesn't in
all releass.
Since you don't want your routers to be reachable from the outside
world, use private address space for the loopbacks. Address
conservation then doesn't become an issue. I frequently start
numbering loopback addresses in 192.198.255.0/24 and work down.
>and then how would this subnet be
>reachable? I mean how would I advertise it in the routing protocol??
Just like any other subnet.
>Thank you
>Regards,
>-------------------------------------------------
>Hossam El-Ashkar
>[EMAIL PROTECTED]
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