From: Godswill Oletu (oletu@inbox.lv)
Date: Sun May 07 2006 - 13:30:46 ART
Michy,
Object tracking that feeds into the HSRP process, will be a better fit. The
hello timer only indicate how often the active and standby router(s) will be
sending hello keeplives. If a standby router have not heard from an active
router, for a period equal to 3 hello timers, it will declare that active
router to be dead and go ahead to implement a coup in order to take over the
role of the active router for that segment.
The object tracking feature on the other hand have a direct relationship
with the tracked interface or ip address and you can configure how often you
want the interface to be tracked.
eg
!
track 1 interface serial0/0 line-protocol
track timer interface 1 <tracks the status of serial0/0 line protocol every
1 sec>
!
interface fa0/0
standby 1 track 1 decrement 90
!
However, to achive the lest delay from the detection of the 'link-down' on a
tracked interface to the standby router assumming the role of the active
router, both methods might be needed. Even if the track timer is reduced to
1 sec and the HSRP hello timer is still at its 3 sec default; the active
router will decrement its priority by the configured value, once it receive
the link down notification from the tracking process, but it will not
communicate its new priority value to the standby router until the next
hello window, which might be 3 secs away. But if all the necessary timers
are adjusted to the say 1 sec; the active router will send its new priority
value to the standby router the next sec after the its traked link came
down. This will give the standby router the opportunity to determine that,
it has a more better priority than the active router and it will begin the
coup process of taking over the role of the active router on that interface
faster than before.
HTH
Godswill Oletu
----- Original Message -----
From: "Michy Eika" <cciemaster@shingor.net>
To: <ccielab@groupstudy.com>
Sent: Sunday, May 07, 2006 9:31 AM
Subject: HSRP timers
> Hi folks!
>
> I'm verifying relation between HSRP timers(hello and hold time) and track
> function.
> If I want to detect the link failure of tracked interface, I need to
> decrease the hello time.
> Is it correct ?( Default value of hello time is 3s , but it'll be detected
> more shortly by
> decreasing it like 1s)
>
> Michy
>
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