[j-nsp] OSPF on a VRRP Interface

[Brandon Ross]

On Thu, 6 Dec 2012, Ali Sumsam wrote:

> Off the top of my head, we cant have OSPF neighbor via VRRP interface, the
> reason would be the router-id. What router-id should it pick.

It is best practice to have a loopback interface and use it for OSPF 
router ID, so you could easily have a unique address to use.

Also, OSPF router ID does not need to be a an address in use on the router 
at all, so you could even configure any old random address, as long as 
it's unique in the network, although that wouldn't be advisable.

And besides all of that, interfaces configured with VRRP always also have 
unique addresses in that subnet, so the router still has a unique address, 
even if you don't follow best practices and haven't manually configured a 
router ID.

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