HI,
platform: WS-C3560X-24T-E
OS version:15.2(2)E
Switch 1 is the Standby,with priority set at 90
Switch 2 is the Active,with priority set at 110
Hello time timer: 3 second (default)
Hold time timer : 10 second (default)
Both switches are up and operational,HSRP works good.
Sometimes,When I power down Switch 2, Switch 1 take over to Active for 12 seconds.
I found following [show standby] on Switch 1:
Swich1#show standby vlan 51
Load for five secs: 19%/0%; one minute: 13%; five minutes: 10%
Time source is NTP, 10:55:43.637 JST Fri Apr 1 2011
Vlan51 - Group 51
State is Standby
7 state changes, last state change 1d23h
Virtual IP address is 10.1.1.1
Active virtual MAC address is 0000.0c07.ac33 (MAC Not In Use)
Local virtual MAC address is 0000.0c07.ac33 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 0.848 secs
Preemption enabled
Active router is 10.1.1.2, priority 110 (expires in 11.824 sec)
Standby router is local
Priority 90 (configured 90)
Group name is "hsrp-Vl51-51" (default)
------------------------------------------------------------------------
Hello time 3 sec, hold time 10 sec
Active router is 10.1.1.2, priority 110 (expires in 11.824 sec)
------------------------------------------------------------------------
According to above information,
hold time expires in 11.824 sec actually.
I thought when standby Switch is received a hello packet which from Active Switch,
by default,holdtime timer will reset to [10sec].
It seems to be reset to [Value] which is above the holdtime [timer].
Does someone know the algorithm for holdtime timer?
[Actually timer]= [holdtime timer] + [?]
Thanks.
