>>>>> On Mon, 11 Jun 2001 15:45:48 -0400 (EDT), <jlewis@lewis.org> said:
jlewis> Given a network such as:
jlewis> -----------------------------------
jlewis> | routerA------T3------routerC |
jlewis> |___ | _________________ | __| area 0
jlewis> | | | | | |
jlewis> | T1s | | T3 |
jlewis> | | / | | |
jlewis> \ | / /-------------\ \ | /
jlewis> routerB-----100bt------routerD
jlewis> \-------------/
jlewis> area 1
jlewis> how do I get around the T1's connecting A and B being the shortest path
jlewis> and get B to send traffic to A via D unless one of the T3's above is down?
jlewis> I can't just use static routes on B, because it won't know if a T3 is
jlewis> down. I've tried playing with "ip ospf cost" on the T1's but B still
jlewis> prefers them.
It's hard! OSPF prefers intra-area routes over inter-area routes, despite
the cost. Make it all area 0 and your active path will be the lowest
cost. Choosing area boundaries is a hard thing to do.
Dave.
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