Thursday, April 4, 2019

OSPF Unnumbered between IOS-XR and Junos

I'm trying to determine if it is possible to establish an OSPF adjacency between IOS-XR and Junos using unnumbered (ethernet) interfaces.

The RFC indicates that the netmask should be ignored on point to point interfaces. However Juniper's take on that is ethernet is not a p2p medium, and so the netmask is considered. On the IOS-XR side, a netmask of 255.255.255.255 is sent, which is different than the 0.0.0.0 that Junos uses. 0.0.0.0 is the RFC compliant mask. And thus no adjacency because the Junos side considers the netmask that IOS-XR sends.

Is there any way to tell one or the other OS to ignore it's own little idiosyncrasy?



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