From: Zouta oxpf (zouta.oxpf@gmail.com)
Date: Tue May 24 2005 - 00:25:37 GMT-3
I guess you are backing up the R1R3 frame link with the ISDN, if this
link is up, then the isdn link should be down (though VL is expected
to be up), then R3 should use R1R3 to reach L0 of R1. If R1R3 is down,
then the expected behavior is to kick in the ISDN, and R3 should now
use the ISDN link to L0 of R1.Is ospf or something keeping ISDN line
up?
ZO
On 5/23/05, Golia, Jeff <JGOLIA@twportanddistribution.com> wrote:
> Hello,
>
> Hopefully you can help explain some OSPF behavior. I am experiencing a
> router preferring Intra-area L3 LSAs with a higher metric, over Inter-area
> L3 LSAs with a lower metric. Is this normal?
> Other clues to the topology follow, along with bad ascii art ;)
>
> R3 ~ISDN~ R5
>
> | /
> Frame Frame
> | /
>
> R1
>
> The ISDN link is area 13. The R1R3 frame is area 12. The R1R5 frame is
> area 0.
>
> The route I am describing is R1 Loopback, which is in area 0. R3 chooses
> the high cost ISDN path over the low-cost inter-area R1R3 frame path.
>
> Virtual-Link through ISDN. The cost on both bri0 ints is 9999. When the
> ISDN is up, the adjacencies form, and the high cost routes enter the routing
> table. R3 will prefer the high cost Intra-area route over a much lower cost
> Inter-area route. It doesn't matter which backup method I use to bring up
> the ISDN, still experience this behavior. Is this normal behavior? The
> ISDN is intra-area because the virtual link creates an extension of area 0.
> If R1 Loopback is moved to area 12 R3 will then prefer the lower-cost R1R3
> Frame intra-area route.
>
>
> Thanks In Advance ; sorry for the long read!
>
> Jeff Golia, CCNP MCSE
> Network Administrator
> Transworld Port and Distribution Services
> Wilmington, Delaware
>
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