From: Michael Stout (michaelgstout@hotmail.com)
Date: Fri Aug 11 2006 - 19:33:06 ART
I don't think you network is a good candidate for studying distannce.
try this
r1-----------r2---------r3------r4
r1----------r6---------r5-------r4
OSPF on top RIP on bottom>
redistriburte mutually using default rip metric of 1>
from r1 trace to R5 rip>
You trace will go r2--r3--r4--r5
that is because ospf has a better DISTANCE and r1 thinks the path to r5
is one hop away if it uses the ospf path but it thinks the path to R5 is
2 hops away if it takes the path through r6.
You need distance so you use the native protocol
Next ad loopbacks to R6 and R5.
You will not be able to trace to the loopbacks from the ospf network
You need to use distance to kill the loop
--------------------------------------------------------------------
From: sabri_esame@yahoo.com
Reply-To: sabri_esame@yahoo.com
To: ccielab@groupstudy.com
Subject: OSPF and the distance command
Date: Fri, 11 Aug 2006 17:50:07 -0400
Hi all,
I'm trying to understand how ospf behaves in relation with the
following command:
distance <#> <route-source> <wildcard> <acl>
I have the following topology:
R1 --------
|
R3
|
R2 --------
R1, R2 and R3 are all in area 0. All routers have their loopbacks
advertised in area0.
R1 and R2 are also ASBRs and can reach the same set of external
networks.
I want to configure R3 in such a way it will forward all traffic for
external networks to R2.
I know I can accomplish that modifying the redistribution metrics in
R1
and R2, but as I said I'm trying to understand how the *distance*
command behaves.
I thought I could solve the problem doing the following:
R3
---
router ospf #
distance 109 <R2 RID> 0.0.0.0 1
access-list 1 deny <R1's loopback>
access-list 1 permit any
but it doesn't work.
All external routes are still load balanced between R1 and R2 and
show
up in the routing table with AD 110.
The only route with AD = 109 is R2's loopback. If I remove the acl
from
the distance command, i.e.
distance 109 <R2 RID> 0.0.0.0
also R1's loopback will be shown with distance 109 and R2 will be
preferred (!!!). All other routes will still be load balanced and
will have
AD 110
Only if I shut the link between R1 and R3 I finally see these routes
with an AD of 109.
I really don't understand what is going on, any ideas?
Thanks
Sabrina
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