Cisco is supposed to be developing a knob to make OSPF look at cost only.
IS-IS has had success with this idea recently.
chris
> -----Original Message-----
> From: Chris Davis [mailto:chris.davis@computerjobs.com]
> Sent: Monday, June 11, 2001 4:05 PM
> To: 'jlewis@lewis.org'; cisco-nsp@puck.nether.net
> Subject: RE: [nsp] how to fool the SPF in OSPF?
>
>
> The order of preference for OSPF routes are as follows:
>
> intra-area routes, O
> inter-area routes O IA
> external routes type 1, O E1
> external routes type 2, O E2
>
> I'm not completely sure about your areas, but it looks like
> you want traffic
> from routerB to traverse area1 to routerA in area 0.
>
> If the T1s could be in area 1 rather than area 0, as they
> probably should be
> based on bandwidth, your problem should be solved.
>
>
>
> -----Original Message-----
> From: jlewis@lewis.org [mailto:jlewis@lewis.org]
> Sent: Monday, June 11, 2001 3:46 PM
> To: cisco-nsp@puck.nether.net
> Subject: [nsp] how to fool the SPF in OSPF?
>
>
> Given a network such as:
>
> -----------------------------------
> | routerA------T3------routerC |
> |___ | _________________ | __| area 0
> | | | | | |
> | T1s | | T3 |
> | | / | | |
> \ | / /-------------\ \ | /
> routerB-----100bt------routerD
> \-------------/
> area 1
>
> how do I get around the T1's connecting A and B being the
> shortest path
> and get B to send traffic to A via D unless one of the T3's
> above is down?
> I can't just use static routes on B, because it won't know if a T3 is
> down. I've tried playing with "ip ospf cost" on the T1's but B still
> prefers them.
>
> --
> ----------------------------------------------------------------------
> Jon Lewis *jlewis@lewis.org*| I route
> System Administrator | therefore you are
> Atlantic Net |
> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
>
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