Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 5 IS-IS Configuration5-115.3.7 Configuring Route RedistributionIS-IS processes the routes discovered by other routing protocols as routes outside arouting domain. You can specify the default cost for IS-IS to redistribute routes fromanother routing protocol.You can configure IS-IS to redistribute routes to Level-1, Level-2, and Level-1-2.Follow these steps to configure route redistribution:To do... Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ tag ] —Redistributeroutes fromanother protocolimport-route protocol[ allow-ibgp ] [ cost value | type{ external | internal } | [ level-1 |level-1-2 | level-2 ] | route-policyroute-policy-name ]*RequiredBy default, IS-IS importsno route from anotherprotocol.Note:z For more about routing information, refer to the section "Configuring an IP RoutingPolicy".z Use the keyword allow-ibgp with care when redistributing routes from BGP,because it redistributes IBGP routes without keeping the AS_PATH attribute,which may lead to routing loops between ASs.5.3.8 Configuring Route FilteringIS-IS can filter received routes and advertised routes based on ACL numbers.I. Configuring received route filteringFollow these steps to configure received route filtering:To do... Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ tag ] —Set the policy for filteringreceived routesfilter-policy acl-numberimportRequiredBy default, IS-IS does notfilter received routes.
