Hi, I am not too familiar with IOS XR but with normal IOS, (carefully) setting the ospf cost helps to avoid load-balancing thru equal-cost (but not equal bandwidth) paths to create an main/backup scenario:
! interface Bundle-Ether2 ip ospf cost 4 ! > 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 _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
