1-3Route Policy ApplicationA route policy is applied on a router to filter routes when they are received, advertised or redistributedand to modify some attributes of permitted routes.Route Policy Configuration Task ListComplete the following tasks to configure a route policy:TaskDefining an IP-prefix ListDefining an AS Path ListDefining a Community ListDefining FiltersDefining an Extended Community ListCreating a Route PolicyDefining if-match ClausesConfiguring a Route PolicyDefining apply ClausesDefining FiltersPrerequisitesBefore configuring this task, you need to decide on:z IP-prefix list namez Matching address rangez Extcommunity list sequence numberDefining an IP-prefix ListDefine an IPv4 prefix listIdentified by name, an IPv4 prefix list can comprise multiple items. Each item specifies a prefix range tomatch and is identified by an index number.An item with a smaller index number is matched first. If one item is matched, the IP prefix list is passed,and the routing information will not go to the next item.Follow these steps to define an IPv4 prefix list:To do… Use the command… RemarksEnter system view system-view —Define an IPv4 prefixlistip ip-prefix ip-prefix-name [ indexindex-number ] { deny | permit } ip-addressmask-length [ greater-equal min-mask-length ][ less-equal max-mask-length ]RequiredNot defined by default.
