From: Tim Fletcher (tim@fletchmail.net)
Date: Thu May 08 2003 - 15:27:28 GMT-3
Lets look at the following sceanrio;
Both routers are up, router B is active, router A is in standby. If router
B goes down, router A will become active. So far, so good. But what happens
when router B comes back up? Without the preempt keyword, router A will
remain active and router B will go into standby, even though router B has a
lower priority. With the preempt keyword, router B will preempt router A
and become active, forcing A to go into standby.
-Tim Fletcher #11406
At 11:37 AM 5/8/2003 -0400, lg01 wrote:
>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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