From: Nentarz, Dave (Dave.Nentarz@xxxxxxxxxx)
Date: Mon May 24 1999 - 11:20:25 GMT-3
I remember seeing a tech tip regarding this.
Configure this under (loopback) interface mode:
ip ospf network point-to-point
This will make OSPF advertise your loopback interface as the network or
subnet it's mask defines, rather than the /32 host route.
I tried searching CCO docs for this to find which IOS level this first
appeared in as a feature, but couldn't find anything on it..I'll keep
looking.. try it in your lab and let me know if it works.
Dave
-----Original Message-----
From: Brian Van Benschoten [mailto:brian.vanbenschoten@inacom-msn.com]
Sent: Sunday, May 23, 1999 12:55 PM
To: ccielab@groupstudy.com
Subject: OSPF and virtual links
I set up a lab test using virtual links. I used loopback interfaces ( with
high ip numbers) on both the routers that the vitural link connected. I did
this for stability and the fact the one of the routers had an ISDN dial
backup link with a higher IP address than the other interaces. This is the
method most people recommend to do in the field. I realized that the
loopbacks must be reachable from both routers in order to establish the
virtual link. (the virtual link command points to the ROUTER ID, not an
interface) so i included the loopbacks in the routing protocol. This got me
thinking about the CCIE lab
A question regarding the CCIE lab exam..... I've had people tell me not to
do anything extra / more than is asked for during the lab. People have told
me that at the end of a section where different ip routing protocols /
redistribution are used, all routers should be able to ping all other
interfaces. Does this mean the "extra" interfaces i created to do a task ?
If i include my loopback interfaces in whatever area my router is in, using
the network command; OSPF advertises loopback interfaces as /32. This mask
wont redistribute into classfull routing protocols like IGRP. I could run
the loopbacks in a seperate area an use the "area range" to summarize those
addresses to match whatever subnet nask the classful protocol needed. But
then am I supposed to create more OSPF areas than what the lab required ? I
could redistribute connected into OSPF but then the routes show up as
external ?
anyone see where I'm going with this ? Any opinions?
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