153To do… Use the command… RemarksSpecify the interval for sendinghello packetsisis timer hello seconds [ level-1 |level-2 ]Optional10 seconds by defaultSpecify the interval for sendingCSNP packets on the DIS of abroadcast networkisis timer csnp seconds [ level-1 |level-2 ]Optional10 seconds by defaultNOTE:The interval between hello packets sent by the DIS is 1/3 the hello interval set with the isis timer hellocommand.Specifying the IS-IS hello multiplierIf a neighbor receives no hello packets from the router within the advertised hold time, it considers therouter down and recalculates the routes. The hold time is the hello multiplier multiplied by the hellointerval.Follow these steps to specify the IS-IS hello multiplier:To do… Use the command… RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —Specify the number of hello packets aneighbor must miss before declaring therouter is downisis timer holding-multiplier value[ level-1 | level-2 ]Optional3 by defaultNOTE:On a broadcast link, Level-1 and Level-2 hello packets are advertised separately; therefore, you need toset a hello multiplier for each level. On a P2P link, Level-1 and Level-2 hello packets are advertised in P2Phello packets, so you do not need to specify Level-1 or Level-2.Configuring a DIS priority for an interfaceOn an IS-IS broadcast network, you must elect a router as the DIS at a routing level. You can specify aDIS priority at a level for an interface. The greater the interface’s priority, the more likely it becomes theDIS. If multiple routers in the broadcast network have the same highest DIS priority, the router with thehighest MAC address becomes the DIS.Follow these steps to specify a DIS priority for an interface:To do… Use the command… RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —Specify a DIS priority for theinterfaceisis dis-priority value [ level-1 |level-2 ]Optional64 by default
