From: Fowlie, Colin (Colin.Fowlie@aliant.ca)
Date: Sat May 15 2004 - 22:32:47 GMT-3
If you want R1 to be active whenever it is available, you will need to
configure R1 to preempt. Without Preemption, R1 will not take over as
the primary when it comes up if R2 is already acting as the primary. So
if R1 goes down, R2 takes over as primary, and R1 comes back online, R2
will remain as the active HSRP router.
If Preemption is configured, there will be a "coup" if a router with a
higher priority comes online. So in that case, if R1 goes down R2 takes
over as the primary. When R1 comes back, it preempts and takes over as
primary once again.
HTH
-Colin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ahmed Mustafa
Sent: Saturday, May 15, 2004 6:45 PM
To: ccielab@groupstudy.com
Subject: HSRP
When is it necessary to configure Preempt while configuring HSRP.
If the requirement is simply configure HSRP between R1 and R2. R1
should be
the first choice, and R2 should be the second choice.
I will simply configure
R1
standby ip 1.1.1.1
standby priority 105
R2
standy ip 1.1.1.1
-------------------------------------------------------------
But if the requirement is R1 should take the role of primary when comes
online
I will then configure
R1
standby ip 1.1.1.1
standby priority 105
standby preempt
I don't think I will need to configure preempt on R2 though.
Sometimes I would see that preempt is configured on both routers that
doesn't
not make any sense to me, unless I am missing something.
Regards,
Ahmed
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