Four routers in a broadcast (ethernet) single area. Two routers are level 2 routers as they reside in two areas. Routing is working as it should. Adjacencies have formed no problem. Both of these level two routers have FR connections to a hub router using p-to-p. This FR network is the other area.
What I would like to do is have the two level-1 routers use only one of the level-2 routers as the default router, using AD as the deciding factor. I have tried to change the AD on one of the level-2 routers using the following commands:
router(config-router)#distance 116 ip
I have also tried the combination:
router(config-router)#distance 116 sourceIP mask
After clearing the routing tables on all routers, neither of these change the routing tables of the level-1 routers.
I have successfully done what I want by changing the metric, but the suboptimal routing takes place from one level-2 router to the other. For example I changed the isis metric on one of the FR links, and the router then tries to use the other FR link to reach the hub.
This is a lab scenario so "best practices" such as simpley injecting a default route I would prefer to avoid.
Any help would be appreciated as the documentation for IS-IS is reather sparse to say the least.
Regards to all.