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

[Lee Starnes]

Thanks everyone who responded. Very helpful. Sorry for the delay in
responding back.


On Thu, Apr 4, 2013 at 6:24 AM, Adrian Turcu <adriant at domeit.net> wrote:

> 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 0.0.0.0
>
> Is this a bug or am I going about this all wrong?
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