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hsrp

Posted on 2006-06-14
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can someone help with an explanation of hsrp and an example of how its configured?

any info or good weblinks would be great

thanks
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Question by:jlymn
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by:prashsax
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by:Sorenson
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if you are considering HSRP for redundancy within your network, I would also take a look at GLBP http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/glbpd_ds.htm as an alternative.  HSRP maintains only one active device at a time, GLBP load balances by responding with different MAC address to different requests, effectivly loading both devices.  In some cases HSRP is the only solution, but GLBP may provide a better fit, and allow multiple links to be used rather than left inactive.
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by:pseudocyber
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Ps.  HSRP and GLBP are both Cisco.  If you're interoperating, or using non-cisco, look at VRRP.
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HSRP (hot standby routing protocol)

is an inter communication between routers that is done via multicast you get a hello between the routers the multicast group is determined by the standby group and the mac address of the configured address.

The primary router will send out a hello every second or so and recieve a reply from the secondary.  The secondary does basically the same thing if either does not reply for 3 consecutive hello periods then if there is a track statement in the interface the priority of the primary interface will fall by 15 (or a set value) depending on the situation.

The configuration depends on your use of HSRP... for instance what are you wanting HSRP to track for a failure?

Thanks
scott

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