[j-nsp] Adjusting OSPF metric based on VRRP state?

[Per Granath]

Your best bet is probably to write an "event-script" that looks for VRRP fail-over, and then changes the OSPF metric for the interface.

> So, I've got 2 J6350s in full flow-mode guise on 11.4, but not a cluster.
> I am trying to use VRRP for some HA though.
> Because they're both "on" the same network segment they both announce
> that prefix into OSPF, and that's causing me a problem.
> If a TCP session arrives via J1 and J2 is the VRRP master, J2 will drop/reject
> the SYN-ACK as it didn't deal with the SYN.
> 
> Now I know I could set "flow tcp-session no-syn-check" to effectively ignore
> the problem, or given suitable amounts of interest/time/effort we could
> probably cluster the 2 devices (different Colo providers in the same building),
> or even use some creativity with static routes (urgh) to bypass OSPF entirely,
> but I'm hoping there is some magic OSPF/VRRP knob I haven't been able to
> find yet that will alter the OSPF metric for a logical interface based on the
> VRRP state.