[c-nsp] OSPF admin distance not working on IOS-XR.

Adrian Turcu adriant at domeit.net
Thu Apr 4 09:24:37 EDT 2013

Are you sure is not just your filtering at the "show route ospf" command, that leads you to believe there you only send over the 2nd bundle?
From the "show ip route" command it looks like both paths are installed and you are sending traffic over both paths equally.

Did you try the following config:

router ospf 12345
 area XXXX			! <--- your area number where the Bundle-Ether interfaces are
   interface Bundle-Ether1
     cost 10
   interface Bundle-Ether2
     cost 20

The above will affect all prefixes learned from these paths, i.e. routes will be preferred via Bundle-Ether1 , while Bundle-Ether2 will be just a backup path.

On 4 Apr 2013, at 11:42, Lee Starnes wrote:

> Hello,
> We are trying to change the administrative distance on one of the OSPF
> neighbors of our router and no matter what it is set to, the value does not
> seem to change.
> #sh ip route x.x.0.102
> Thu Apr  4 02:36:05.122
> Routing entry for x.x.0.102/32
>  Known via "ospf 12345", distance 110, metric 2, type intra area
>  Installed Apr  4 02:14:55.059 for 00:21:10
>  Routing Descriptor Blocks
>    x.x.25.19, from x.x.0.102, via Bundle-Ether1
>      Route metric is 2
>    x.x.25.34, from x.x.0.102, via Bundle-Ether2
>      Route metric is 2
>  No advertising protos.
> #sh route ospf | incl x.x.0.102
> Thu Apr  4 03:31:36.554
> O    x.x.0.102/32 [110/2] via x.x.25.34, 01:16:40, Bundle-Ether2
> The issue here is that we are trying to avoid sending a majority of our
> traffic through Bundle-Ether2 which it seems OSPF has decided is the best
> Path. The 0.102 address is a loopback interface of a neighbor (6500b)
> directly connected to Bundle-Ether1, where Bundle-Ether2 is connected to
> 6500a with less capacity on it's links. This is causing the links on
> bundle2 to get saturated at peak times.
> XR-bundle2--->6500a--->6500b
> XR-bundle1--->6500b--->6500a
> Configured XR router:
> router ospf 12345
> log adjacency changes
> distance 120 x.x.25.34
> Is this a bug or am I going about this all wrong?
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