363Routing policy configurationRouting policies are used to receive, advertise, and redistribute only specific routes and modify theattributes of some routes.NOTE:• Routing policy in this chapter involves both IPv4 routing policy and IPv6 routing policy.• The S5500-SI Switch Series does not support OSPF, BGP, IS-IS, OSPFv3, IPv6 BGP, IPv6 IS-IS, or FRR.Introduction to routing policyA routing policy is used to filter routes when they are received, advertised, or redistributed and modifythe attributes of some routes.Routing policy applicationA routing policy has the following applications:• Filters advertised routes• Filters received routes• Filters redistributed routes• Modifies or sets the attributes of some routesRouting policy implementationTo configure a routing policy, you must do the following:1. Define some filters based on the attributes of routing information, such as destination address, andthe advertising router’s address.2. Apply the filters to the routing policy.You can use multiple filters to define match criteria. For detailed information, see “Filters.”FiltersYou can use the following types of filters: ACL, IP prefix list, AS path ACL, community list, extendedcommunity list, and routing policy.ACLACL involves IPv4 ACL and IPv6 ACL. An ACL is configured to match the destinations or next hops ofrouting information.For more information about ACL, see ACL and QoS Configuration Guide.IP prefix listIP prefix list involves IPv4 prefix list and IPv6 prefix list.
