Hi,
Your scenario looks like a complete opposite of what we have in the case
study, from what you have mentioned here.. The solution would be that on R6
and R7 you set the ospf external-preference to be lower than 149.. This
would make the def route from OSPF more preferred.
set protocols ospf external-preference 148 <-- Make the nssa def route
preference on R6 and R7 to be lower than that received from the ISIS DC
router.
-Hoogen
2009/11/7 Walaa Abdel razzak <wala...@bmc.com.sa>
> Hi Experts
>
>
>
> If you have area 2 nssa receiving default route from the ABR with metric
> 150, two routers R6, R7 are sending this default route to ISIS level 1
> router in the DC. The L1 external preference are modified on R6, R7 to be
> 149. This is to prefer routes coming from ISIS than OSPF. The problem is
> that DC router resend the default route from R6 to R7. R7 see it with
> preference of 149 and the default route is coming from OSPF is 150 so it
> prefers the ISIS which cause non-optimal routing. Any ideas to solve this
> issue without making modification on the DC router?
>
>
>
> Sample config:
>
>
>
> R6 or R7 config.:
>
> --------------------
>
> isis {
>
> export senddefault; --------à send default to the ISIS router
>
> level 2 disable;
>
> level 1 external-preference 149;
>
> interface fe-1/3/1.23;
>
> interface lo0.6;
>
> }
>
> ospf {
>
> export fromisis; --------à redistribute routes from ISIS
>
> area 0.0.0.2 {
>
> nssa;
>
> interface lo0.6;
>
> interface fe-1/3/0.20;
>
> interface fe-1/3/1.16;
>
> interface fe-1/3/1.23 {
>
> passive;
>
> }
>
> }
>
> }
>
>
>
> DC:
>
> -----
>
> isis {
>
> export static-isis;
>
> level 2 disable;
>
> interface fe-1/3/0.23;
>
> interface fe-1/3/0.24;
>
> }
>
>
>
> BR,
>
> Walaa Abdel Razzak
>
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