[j-nsp] VRRP and preempt

Pekka Savola pekkas at netcore.fi
Sun Jul 16 11:51:15 EDT 2006

On Sun, 16 Jul 2006, Jee Kay wrote:
> I've got a pair of M5s (running 6.3R1.4 which I know is old etc etc) 
> that present a number of VRRP addresses to end systems. Both of them 
> have 'preempt { hold-time 600; }' configured for all of their 
> addresses.
> Despite this, when the 'primary' router reboots and comes back online,
> it _immediately_ takes ownership of all the VRRP addresses resulting
> in an outage as it seems to start its VRRP processes before its OSPF
> processes and therefore is clueless as to what to do with the data
> it's just decided it should be getting.
> Has anyone else seen this?

I just looked at the logs from the latest SW upgrade, and VRRP 
mastership is switched back after a bit over 8 minutes after OSPF 
adjacencies have been established (with preempt hold-time 600), so 
this seems to be working as expected at least in our scenario in 7.5SR 
or so.

Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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