R3 in area13 has two link connected area0 via separate ABR(R1 & R2), the backup tunnel has been set a higher interface cost to insure it will not be choosed if the SDH is UP.
Actually i found the route 10.13.0.0/16 in R1 was correctly choosed SDH as next-hope, but R2 choosed the backup tunnel directly even if the route metric is higher. In my idea, the R2 should choose R1 as next-hope and via SDH to reach 10.13.0.0/16.
If i shutdown the backup tunnel manually, R2 will choose R1 as next-hope for the route 10.13.0.0/16.
I must got some misunderstand in the OSPF area design, anyone help to clarify will be much appreciated.
In your design, R2 will naturally pick its nexthop thro. tunnel interface for the area0 or inter-area routes becz always an intra-area route is always preferred to a inter-area route regardless of metric and also R2 itself is the ABR for the inter-area routes.
But R3 might choose R1 as a nexthop becz of your cost configurations.
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