If you want to be able to address the router as a whole (rather than a
particular interface), for example for SNMP, telnet, etc, then using a
loopback address is a good way to do it. Of course, if you do this, your
loopback address needs to be included in OSPF (or whatever routing protocol
you're running) so that it is visible throughout your network.
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 18/05/2001
09:22 am ---------------------------
"CCNP" @groupstudy.com on 17/05/2001 04:20:38 pm
Please respond to "CCNP"
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Fw: Loopback interface for OSPF [7:4802]
----- Original Message -----
From: "CCNP"
To:
Sent: Thursday, May 17, 2001 11:19 AM
Subject: Re: Loopback interface for OSPF [7:4802]
> 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
> > > FAQ, list archives, and subscription info:
> > http://www.groupstudy.com/list/cisco.html
> > > Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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