5-18z Configure an IP address for each interface, and make sure all neighboring nodes are reachable toeach other at the network layer.Enabling IS-ISFollow these steps to enable IS-IS:To do… Use the command… RemarksEnter system view system-view ––Enable the IS-IS routing processand enter its viewisis [ process-id ] [ vpn-instancevpn-instance-name ]RequiredNot enabled by defaultAssign a network entity title (NET) network-entity netRequiredNot assigned by defaultReturn to system view quit ––Enter interface view interface interface-typeinterface-number ––Enable an IS-IS process on theinterface isis enable [ process-id ]RequiredDisabled by defaultConfiguring the IS Level and Circuit LevelIf only one area is available, it is recommended that:z Configure the IS level of all routers as Level-1 or Level-2 and don’t configure different levels in thiscase because there is no need for all routers to maintain two identical LSDBs;z Configure the IS level as Level-2 on all routers in an IP network for scalability.For an interface of a Level-1 (or Level-2) router, the circuit level can only be Level-1 (or Level-2). Foran interface of a Level-1-2 router, the default circuit level is Level-1-2; if the router only needs to formLevel-1 (or Level-2) neighbor relationships, you can configure the circuit level for its interfaces asLevel-1 (or Level-2) to limit neighbor relationship establishment.Follow these steps to configure the IS level and circuit level:To do… Use the command… RemarksEnter system view system-view ––Enter IS-IS view isis [ process-id ] [ vpn-instancevpn-instance-name ] ––Specify the IS level is-level { level-1 | level-1-2 |level-2 }OptionalThe default is Level-1-2.Return to system view quit ––
