158To do… Use the command… RemarksSet the overload bitset-overload [ on-startup [ [ start-from-nbr system-id[ timeout1 [ nbr-timeout ] ] ] | timeout2 ] [ allow { external| interlevel } * ]RequiredNot set by defaultConfiguring system ID to host name mappingsIn IS-IS, a system ID identifies a router or host uniquely. A system ID has a fixed length of 6 bytes. Whenan administrator needs to view IS-IS neighbor information, routing table or LSDB information, using thesystem IDs in dotted decimal notation is not convenient. To solve it, you can configure the mappingsbetween system IDs and host names, as host names are easier to remember and use.Such mappings can be configured manually or dynamically. Note the following:• Using the display isis lsdb command on a router configured with dynamic system ID to host namemapping displays router names rather than system IDs.• If you configure both dynamic and static system ID to host name mappings on a router, the hostname for dynamic system ID to host name mapping applies.Configuring a static system ID to host name mappingFollow these steps to configure a static system ID to host name mapping:To do… Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ process-id ] [ vpn-instancevpn-instance-name ] —Configure a system ID to host namemapping for a remote IS is-name map sys-id map-sys-nameRequiredA system ID can only correspond toa host name.Configuring dynamic system ID to host name mappingConfigure a static system ID to host name mapping for any other router in a network. When a new routeris added into the network or a mapping must be modified, perform configuration on all routers.You can configure dynamic system ID to host name mapping. To do so, you must configure a host namefor each router in the network. Each router advertises the host name in dynamic host name CLVs to otherrouters. Then, all routers in the network have all the mappings to generate a mapping table.In addition, you can configure a name for the DIS in a broadcast network to help check the origin of LSPsin the LSDB.Follow these steps to configure dynamic system ID to host name mapping:To do… Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ process-id ] [ vpn-instancevpn-instance-name ] —Specify a host name for therouter is-name sys-name RequiredNot specified by default.Return to system view quit —
