Operation Manual – IPv6 RoutingH3C S7500E Series Ethernet Switches Chapter 6 Routing Policy Configuration6-1Chapter 6 Routing Policy ConfigurationNote:At present, the LSQ1GP12EA boards in the S7500E series do not support IPv6.6.1 Introduction to Routing Policy6.1.1 Routing PolicyA routing policy is used on the router for route inspection, filtering, attributes modifyingwhen routes are received, advertised, or redistributed.When distributing or receiving routing information, a router can use a routing policy tofilter routing information. For example, a router receives or advertises only routinginformation that matches the criteria of a routing policy; a routing protocol redistributesroutes from another protocol only routes matching the criteria of a routing policy andmodifies some attributes of these routes to satisfy its needs using the routing policy.To implement a routing policy, you need to define a set of match criteria according toattributes in routing information, such as destination address, advertising router’saddress and so on. The match criteria can be set beforehand and then apply them to arouting policy for route distribution, reception and redistribution.6.1.2 FiltersRouting protocols can use six filters: ACL, IP prefix list, AS path ACL, community list,extended community list and routing policy.I. ACLWhen defining an ACL, you can specify IP addresses and prefixes to matchdestinations or next hops of routing information.For ACL configuration, refer to the part discussing ACL operation.II. IP prefix listIP prefix list plays a role similar to ACL, but it is more flexible than ACL and easier tounderstand. When an IP prefix list is applied to filtering routing information, its matchingobject is the destination address of routing information.
