From: Bogdan Sass (bogdan.sass@catc.ro)
Date: Sat Sep 27 2008 - 11:36:27 ART
Paul Cosgrove wrote:
>> The interface used for the RID is the loopback (Lo0) interface on
>> R3. I was just testing your suggestion (applying "no compatible
>> rfc1583"), and SW4 still installs both routes towards 158.1.0.0/24.
>
<snip>
> So multiple routes should be installed in the routing table if there
> are multiple paths to the ASBR. Path preference will become an issue
> if ospf is not permitted to install all of those paths.
>
> Given the requirements of the question which you mentioned you can use
> area 38 default-cost 10 on SW4 to stop the loop.
> But just to complicate matters... I've just tried a simple setup (just
> with 3 ospf 12.2 routers) and the behaviour I saw seems a little
> different to the rfc:
> - If the cost to the forwarding address via area 0 is lower than the
> cost via area 38, then only the path via area 0 is installed in the
> routing table.
> - If the cost to the forwarding address via area 0 is equal to, or
> higher than, the cost via area 38, then both paths are installed in
> the routing table.
> Paul.
Once again, a very detailed and helpful answer. This clears up
everything - thank you for all your help!!
[ Well... I guess the problem of Cisco routers ignoring the RFC
remains open - but then again, there is not much we can do to change
that :) ]
-- Bogdan Sass CCAI,CCNP,CCSP,JNCIA-ER Information Systems Security Professional "Curiosity was framed - ignorance killed the cat"Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Sat Oct 04 2008 - 09:26:20 ART