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CCNA Certification: Configure RIP Timers

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by: ahmedmohamed
Total views: 105 - Word Count: 348 - Date: Thu, 27 Jan 2011

The RIP routing protocol has four timers that it used them to manage the interval time between two consecutive updates, manage RIP routes, and prevent RIP routing loops. Each timer is expressed in seconds. In the coming paragraphs, you'll learn how each timer works and how to set its value and verify if it is applicable or not.

RIP timers are update, invalid, holddown, and flush. The update timer is the amount of time at which the router sends RIP updates. By default, RIP updates are sent every 30 seconds. The invalid timer specifies the amount of time that the router should wait before it considers a specific route as invalid. This means, if the router did not receive a RIP update including a specific route "X" within the invalid time interval after the last update( including the "X" route), then the route "X" will be marked as invalid. The holddown timer determines the amount of time that the router should wait before accepting new routing information about an unreachable route. The flush timer defines the amount of time that router will wait before removing an invalid route from the routing table.

To change one or all of these timers, use the timers basic command. The timers basic command has the following syntax:

timers basic update invalid holddown flush

The default values for the update, invalid, holddown, and flush parameters are 30 seconds, 180 seconds, 180 seconds, and 240 seconds, respectively. This command was introduced in the Cisco IOS Software Release 10.0.

The following configuration sets the values of update, invalid, holddown, and flush timers on a router named R1 to 10 seconds, 60 seconds, 60 seconds, and 80 seconds, respectively.

R1(config)#router rip
R1(config-router)#version 2
R1(config-router)#network 10.0.0.0
R1(config-router)#network 140.1.0.0
R1(config-router)#no auto-summary
R1(config-router)#timers basic 10 60 60 80
R1(config-router)#^Z
R1#

To verify your configuration, you can use the show ip protocols command in the privileged EXEC mode. Keep in mind that short update timer can cause congestion over show-speed serial links.

About the Author

If you have a setup RIP for different subnets within the same network IP addressing space, then you should first calculate subnet IP addresses using a subnet calculator.

Remember to download and read the CCNA syllabus in order to pass the CCNA certification exam.

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