From: Brown, Patrick (NSOC-OCF} (PBrown4@chartercom.com)
Date: Thu May 08 2003 - 14:01:47 GMT-3
An HSRP-enabled router with preempt configured will attempt to assume
control as the active router when its Hot Standby priority is higher than
the current active router. The standby preempt command is needed in
situations when you wish an occurring state change of a tracked interface to
cause a standby router to take over from the active router. Example: Active
router is tracking another interface and decrements its priority when that
interface goes down. The standby router priority is now higher and it sees
the state change in the hello packet priority field. If preempt is not
configured, it can't take over and failover doesn't occur.
In your case no, but if you are tracking an interface, yes!
Thanks,
Patrick B
-----Original Message-----
From: lg01 [mailto:lg01@myway.com]
Sent: Thursday, May 08, 2003 10:37 AM
To: ccielab@groupstudy.com
Subject: HSRP question
Hello Group,
If I have 2 ethernet interfaces routers configured with HSRP, is it
necessary to have the "preempt" option on the 2nd (lower priority router)?
Say RouterA
int eth0
ip address 192.168.1.1 255.255.255.0
standby 1 ip 192.168.1.10
standby 1 priority 200
standby 1 authentication cisco
standby 1 preempt
And on RouterB
int eth0
ip address 192.168.1.2 255.255.255.0
standby 1 ip 192.168.1.10
standby 1 priority 150
standby 1 authentication cisco
standby 1 preempt ----- Is this needed?
The logic I am thinking is that since RouterB has a lower HSRP priority, if
RouterA is offline, it will become the primary router. But if RouterA is
online, it will always be on Standby anyway, so I'm not sure whether there
is any need for this.
Any input / advice would be greatly appreciated.
Regards,
H.
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