Brad is very correct on the use of Loopback interface in OSPF.
1. Loopback interface is more stable than any other physical interface.
Catch here is OSPF will continue to use a RID learned from a physical
interface even if the interface subsequently fails. So nothing great about
this advantage.
2. Admin's can assign RID in a more controlled way because RID's can belong
to same network/subnet across the entire OSPF domain. This is the main
advantage of using Loopback interface in OSPF.
Brijesh
----- Original Message -----
From: "Brad McConnell"
To:
Sent: Thursday, May 17, 2001 10:50 AM
Subject: Re: Loopback interface for OSPF [7:4802]
> There's not much point in putting the loopbacks in their own area unless
> you're in a lab scenario and trying to make a bigger, more complicated
> network. ..At least not that I can think of. However, there is
definitely
> a usefulness for loopback interfaces in OSPF -- use them to set your RIDs
> (used to indentify the router in OSPF LSA's) to controllable, meaningfull
> addresses. This doesn't even require that the loopbacks be part of the
OSPF
> domain, just that they be configured and up. Highest loopback IP on the
> router will be the OSPF RID of any LSA's generated by that router (as
shown
> in commands such as show ip ospf neighbor, etc)...
>
> -Brad McConnell
>
> ""Vincent Chong"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Hi;
> >
> > For OSPF implementation, an area can be configured in the Loopback
> > interface.
> > But what purpose, when should I do it?
> >
> > TIA
> > Vincent Chong
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