Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 5 IS-IS Configuration5-12II. Configuring IS-IS to filter the routes advertised by other routing protocolsFollow these steps to configure IS-IS to filter the routes advertised by other routingprotocols:To do... Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ tag ] —Set the policy for filteringthe routes advertised byother protocolsfilter-policy acl-numberexport [ protocol ]RequiredBy default, IS-IS does notreceive the routesadvertised by otherrouting protocols.Note:z The filter-policy import command filters only the IS-IS routes received fromneighbors. The routes that cannot pass the filtering will not be added to the routingtable.z The filter-policy export command only applies to the routes imported with theimport-route command. The filter-policy export command will not work if you donot configure the import-route command to import non-IS-IS routes.z If you do not specify which type of routes are to be filtered with the filter-policyexport command, all the routes imported with the import-route command will befiltered.5.3.9 Configuring Route LeakingThrough route leaking, a Level-2 router can send the Level-1 area routing informationand Level-2 area routing information that it knows to a Level-1 router.Follow these steps to configure route leaking:To do... Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ tag ] —Enable route leakingimport-route isis level-2into level-1 [ aclacl-number ]RequiredBy default, a Level-2 routersends no routing information toa Level-1 area.
