Re: HSRP active router tells standby to take over when being

If you power off, the resign message should not be there and ping drops should occur...you are doing a graceful restart functionality....

Sent from my iPad

On 21/09/2011, at 12:15 PM, "Joseph L. Brunner" <joe_at_affirmedsystems.com> wrote:

> One cool fact I thought I would share with the group - Understanding the HSRP
> resign message...
>
> This evening I'm testing various failover scenarios and I have my primary
> (HSRP active) router (.2) the HSRP primary (for .1) on an external segment
> (where 2 ASA's default to the HSRP virtual address (.11 , .10)
>
> I don't use standby tracking on the primary router - it's simply tracking its
> local ISP connection default route via an SLA ping of the ISP adjacent
> neighbor on metro-E and track object. I have a backup default route, AD 254,
> to the Standby router (.3) on the segment. If the primary router is up, but
> has no valid default route (cause it can't ping the adjacent ISP) it routes
> all traffic to standby router.
>
> So I started my failover testing by rebooting primary router and doing a
> continuous ping of 4.2.2.2. Well, no pings were missed during the reboot!!! (I
> expected about 10 missed pings as the standby router became hsrp primary and
> took over .1, the default gateway of the ASA's). (if you're sharp you caught
> the fact we're obviously natting the first public range to a second public
> range on the standby router to go out a different ISP)
>
> Here is the debug output on the HSRP standby router during the primary's
> reboot (watch for the "resign rcvd" where the primary RESIGNS and allows the
> standby to become active MUCH FASTER than the timers)
>
> kcf1515-edge-rtr2#debug standby
> HSRP debugging is on
> kcf1515-edge-rtr2#
> Sep 21 04:08:15.504: HSRP: Gi0/0 Grp 1 Hello in 174.58.91.2 Active pri 150
> vIP 174.58.91.1
> Sep 21 04:08:15.824: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Standby pri 100
> vIP 174.58.91.1
> Sep 21 04:08:18.824: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Standby pri 100
> vIP 174.58.91.1
> Sep 21 04:08:19.352: HSRP: Gi0/0 Grp 1 Hello in 174.58.91.2 Active pri 150
> vIP 174.58.91.1
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Resign in 174.58.91.2 Active pri 150
> vIP 174.58.91.1
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Standby: i/Resign rcvd
> (150/174.58.91.2)
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Active router is local, was
> 174.58.91.2
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Standby router is unknown, was local
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Standby -> Active
> Sep 21 04:08:21.516: %HSRP-5-STATECHANGE: GigabitEthernet0/0 Grp 1 state
> Standby -> Active
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Redundancy "hsrp-Gi0/0-1" state Standby
> -> Active
> Sep 21 04:08:21.516: HSRP: Gi0/0 Redundancy server "hsrp-Gi0/0-1" update,
> Standby -> Active
> Sep 21 04:08:21.516: HSRP: Gi0/0 Redirect adv out, Active, active 1 passive 1
> Sep 21 04:08:21.516: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Active pri 100
> vIP 174.58.91.1
> Sep 21 04:08:24.516: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Active pri 100
> vIP 174.58.91.1
> Sep 21 04:08:24.516: HSRP: Gi0/0 Grp 1 Redundancy group hsrp-Gi0/0-1 state
> Active -> Active
> Sep 21 04:08:27.516: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Active pri 100
> vIP 174.58.91.1
> Sep 21 04:08:27.516: HSRP: Gi0/0 Grp 1 Redundancy group hsrp-Gi0/0-1 state
> Active -> Active
> kcf1515-edge-rtr2#
> Sep 21 04:08:30.076: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Active pri 100
> vIP 174.58.91.1
> Sep 21 04:08:30.516: HSRP: Gi0/0 Grp 1 Hello out 174.58.91.3 Active pri 100
> vIP 174.58.91.1
> kcf1515-edge-rtr2#un all
> All possible debugging has been turned off
>
>
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Received on Wed Sep 21 2011 - 16:00:31 ART