[j-nsp] vrrp advertise and hold time

[Felix Schueren]

Taqdir Singh wrote:
> Hi all,
> 
>        I have read that in juniper vrrp has advertise time of 1 sec and
> holdtime of 0 sec by default ?
generally, VRRP waits for (3 * advertise time) (as per the RFC). I never 
checked if the Skew_Time (lower priority makes you wait longer) is 
implemented in Juniper, but they definitively wait for 3*advertise time. 
This is true for normal as well as the fast-interval sub-second stuff.

> 
> So could you confirm ........is advertise-time = hello time in cisco ?
supposedly. I've never used vrrp on cisco.

> 
> if this is so... and if we are taking hold time of 0 sec... in that case
> backup router will never wait for even one sec and there will always be
> state change in backup and master ?
> 
If there was a 0 hold time, yes. But at least on my routers, I have 
never seen a hold-time setting for vrrp.
In Juniper, hold-time normally is a property of the physical interface 
that delays a "link down" or "link up" notification to the rest of 
router for a short time (and will not send any at all if the link is 
restored to it's previous state quickly enough, so if you have 
"hold-time up 2000ms" and plug in a link, then unplug it a second later, 
it will never fire the "link up" event).

Where did you get the "holdtime 0" from?

Kind regards,

Felix

-- 
Felix Schüren
Head of Network

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