HSRP (Preempt and timer)
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HSRP (Preempt and timer)

 
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kian_hong2000



Joined: 08 Nov 2006
Posts: 8
Posted: Sat Nov 17, 2007 9:17 am    Post subject: HSRP (Preempt and timer) Reply with quote
Say there are two Router R1 and R2 configure with HSRP. R1 is active and R2 is standby. R1 has the command "standby 1 preempt" configure on it. Both R1 and R2 configure with "standby 1 timers 5 10.

1) Now there is a network failure on R1.
I know R2 will take over as active. How long will R2 take over as active from R1?
is it depend on holdtime which is 10 sec in this case?

2) If R1 has recover, will R1 regain as active router from R2 straignt away? Must R1 have to wait to regain its active status? I heard in real world, R2 would still be active until a reboot on R2 then R1 will regain his active status.
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bitgod



Joined: 13 Nov 2007
Posts: 9
Posted: Mon Nov 26, 2007 4:30 am    Post subject: Reply with quote
R1 with standby preempt configured on it will assume active so long as its online. R2 without standby preempt configured will only be the active router when it is not seeing the hello packets from R1.

Holdtime is how long it waits from missing hellos to take over. In your case, if it doesn't get a hello within 10 seconds it will assume the other is down and take active.
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