I am going to be testing some HSRP configurations this evening for one of our Customers.
They have 2 2600 series routers facing the Internet. Each of these two boxes has an Ethernet connection to the Internet, and has an Ethernet connection running as HSRP.
My question is this... I understand that a preempt statement will make the router with the highest priority become the Active Router. I am not sure where to put the preempt statement,,,does it go on the Primary or the secondary.
Also, should I set up the HSRP tracking statement on both boxes to monitor the interface connected to the Internet?
Under normal circumstances the 'preempt' command is configured on the primary hsrp router but if you are tracking another interface then 'preempt' should be configured on both devices. This would ensure the lower priority router can become the active router when the primary router's tracked interface goes down.
Ideally you should have the Preempt and the tracking command on both the routers so that the router with the highest priority becomes the active router.
when you do this, the moment a router senses a link failure it will reduce its HSRP priority and since preempt is configured on both the routers, the second router will take the active role.
If you have the preempt configured only on the primary router, a link failure on this router would not cause the HSRP state change as the router is still active. so packets still treach this router only to be sent back to the standby router for routing (provided you have proper routing in place)
I see one potential issue that would require the use of HSRP enhanced object tracking feature. Since you are tracking an Ethernet interface which mayn't always go down when it's not passing data which would cause HSRP tracking to not work as intended. That's when HSRP enhanced object tracking can come in handy. Take a look at the following link for more info.
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