3Com Switch 8800 Configuration Guide Chapter 18 RIP Configuration18-9broadcast packets. In addition, this mode can also make the hosts running RIP-1 avoidincorrectly receiving and processing the routes with subnet mask in RIP-2. When aninterface is running in RIP-2 broadcast mode, the RIP-1 packets can also be received.Perform the following configuration in interface view:Table 18-12 Specify RIP version of the interfaceOperation CommandSpecify the RIP version as RIP-1 for the interface rip version 1Specify the RIP version as RIP-2 for the interface rip version 2 [ broadcast |multicast ]Restore the default RIP version running on theinterface undo rip versionBy default, the interface receives and sends the RIP-1 packets. It will transmit packetsin multicast mode when the interface RIP version is set to RIP-2.18.2.12 Configuring RIP TimersAs mentioned previously, RIP has three timers: Period update, Timeout andGarbage-collection. Modification of these timers affects RIP convergence speed.Perform the following configuration in RIP view.Table 18-13 Configure RIP timersOperation CommandConfigure RIP timers timers { update update-timer-length | timeouttimeout-timer-length } *Restore the default settings ofRIP timers undo timers { update | timeout } *The modification of RIP timers is validated immediately.By default, the values of Period Update and Timeout timers are 30 seconds and 180seconds respectively. The value of Garbage-collection timer is four times that of PeriodUpdate timer: 120 seconds.In fact, you may find that the timeout time of Garbage-collection timer is not fixed. IfPeriod Update timer is set to 30 seconds, Garbage-collection timer might range from 90to 120 seconds.Before RIP completely deletes an unreachable route from the routing table, itadvertises the route by sending four Period Update packets with route metric of 16, soas to acknowledge all the neighbors that the route is unreachable. As routes cannot
