Filters

Routing policies can use the following filters to match routes.

ACLs include IPv4 ACLs and IPv6 ACLs. An ACL can match the destination or next hop of routing information.

For more information about ACLs, see ACL and QoS Configuration Guide.

IP prefix lists include IPv4 prefix lists and IPv6 prefix lists.

An IP prefix list matches the destination address of routing information. You can use the gateway option to receive routing information only from specific routers. For more information about the gateway option, see "Configuring RIP" and "Configuring OSPF."

An IP prefix list, identified by name, can comprise multiple items. Each item, identified by an index number, specifies a prefix range to match. An item with a smaller index number is matched first. A route that matches one item matches the IP prefix list.

An AS path list matches the AS_PATH attribute of BGP routing information.

For more information about AS path lists, see "Configuring BGP."

A community list matches the COMMUNITY attribute of BGP routing information.

For more information about community lists, see "Configuring BGP."

An extended community list matches the extended community attribute (Route-Target for VPN) of BGP routing information.

For more information about extended community lists, see MPLS Configuration Guide.