Failover concept clarification

[pat]

Hi david thanks for your reply.

Some more clarifications required.

My secondary server has the state in lease file now as mentioned below.

failover peer "failover" state {
      my state partner-down at 4 2009/07/05 00:09:41;
      partner state normat at 2 2009/07/05  17:50:35;
      mclt 1800;
}

What will be the time to expire before my secondary responds to all the
clients request?

is it 00hr:09min:41sec + 1800 sec = 00hr:39min:41sec so my secondary server
will wait for 39min and 41 sec before answering all my clients request.

how do i calculate the STOS+MCLT time.

Regards
Pat

On Thu, Jun 18, 2009 at 10:00 PM, David W. Hankins <dhankins at isc.org> wrote:

> On Thu, Jun 18, 2009 at 04:11:43PM +0530, pat wrote:
> > so now i got both the timers from omshell
> >
> > mclt=00:00:00:0a
> > partner-state=00:00:00:02
> > local-state=00:00:00:03
>
> State 3 is 'communications-interrupted' in all versions.  What I
> described only takes affect in partner-down (either 1 or 4 depending
> on version), which I thought from your earlier description you had
> said you had set the local state to.
>
> In communications-interrupted, the server cannot be sure that the
> peer is not assigning leases to clients, so it cannot allocate from
> the peer's free-state pool at any time.
>
> > partner-stos=4a:38:99:e4
> > local-stos=4a:3a:05:2a
> >
> > so now what is the timer it will wait for to server all the lease.
>
> In communications-interrupted, never.
>
> In partner-down, local-stos+mclt, but this is easier to observe in the
> dhcpd.leases file's lastmost 'failover {}' stanza.
>
> --
>  David W. Hankins        "If you don't do it right the first time,
> Software Engineer                    you'll just have to do it again."
> Internet Systems Consortium, Inc.               -- Jack T. Hankins
>
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