[j-nsp] OSPF on a VRRP Interface

[Ali Sumsam]

You are right Brandon, but i didn't mean that.
I know OSPF doesnt need to be reachable to router-id to converge.
I am thinking from topology table perspective. What if the router who is
VRRP master fails, same IP assigned to the secondary router, but this time
different router-id, and whole topology table. I just wonder how the
convergence will take place.

Regards,
*Ali Sumsam CCIE*
*Network Engineer - Level 3*
eintellego Pty Ltd
ali at eintellego.net ; www.eintellego.net

Phone: 1300 753 383 ; Fax: (+612) 8572 9954

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The Experts Who The Experts Call
Juniper - Cisco – Brocade - IBM



On Thu, Dec 6, 2012 at 4:26 PM, Brandon Ross <bross at pobox.com> wrote:

> 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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