IPv6 (Cisco) Training - Using the "Standby Priority" Command

Well, before I begin explaining this week's article; I would like to say, "Happy holidays to all of my readers"; because of you it's been a very astounding year!

Now, that I've humbly thanked all of you, let's move on to this week's article.

Well, if you're planning to run the Hot Standby Router Protocol (HSRP) within your Cisco environment. You'll need to have at least two Hot Standby Routers to form a HSRP group, and one of these routers will need to be configured to act as the "active" router. So, that's when you'll need to use the "standby priority" command.

Basically, the Cisco IOS interface command named "standby priority" is used to set a Hot Standby Router's priority. It is applied to the interface that is participating in a HSRP group (that is the interface that's communicating with another HSRP router).

And, within an HSRP group, the router's interface that has the highest priority; is the router that will become the "active" router. By default, all Cisco routers belong to HSRP group 0.

Below is the correct syntax and example of the "standby priority" command:

Syntax: standby [group-number] priority priority

The "optional" group-number argument portion of the command; is used to set the group number on the interface. (By default the group number is 0)

And, the "priority" argument portion of the command; is used to set the priority value that prioritizes a potential Hot Standby router. The range is from 1 to 255, where 1 means the lowest priority and 255 means the highest priority. The default priority value is 100. The router in the HSRP group with the highest priority value becomes the active router.

Example:

router>enable

router#configure terminal

router(config)#interface fastethernet 0/0

router(config-if)#standby ip 172.19.107.254

router(config-if)#standby priority 110

router(config-if)#end

router#copy run start

In the above example, the router's fastethernet 0/0 interface will have the (standby) priority of 110.

If you need to restore a router's interface back to its default values, all you need to do is type the word "no" in front of the command like you see below:

router(config-if)#no standby priority

And, if you plan on using the command in an IPv6 environment; make sure your Cisco IOS routers are running 12.4(4)T or higher.

I hope this article was very informative and helped you quickly understand the usage of the "standby priority" interface configuration command. If you need to learn more; I suggest you visit my website, were you'll find the latest information regarding Cisco IPv6 Design and Implementation Techniques.

To your success,

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