IP Routing Primer

Primary Activities of Convergence

Convergence involves four primary activities: update, invalid, holddown, and flush, which are explained in Table 2-1. The following example, which uses the show ip protocol command at the command prompt of RouterA, shows the default timers used by RIP. These are the timers that a Cisco router uses to control the way RIP reacts to changes in its routing table. It is possible to override these defaults by using the timers basic command. See the Cisco command reference for the version of IOS you are using for more information on this command.

Figure 2-1. RouterA has to converge on a new path because the link to RouterC has gone down.

Note

The timers basic command should be used with caution. Inappropriate use ...