365Routing policy configuration task listComplete the following tasks to configure a routing policy:TaskDefining an IP-prefix listDefining an AS path listDefining a community listDefining filtersDefining an extended community listCreating a routing policyDefining if-match clausesDefining apply clausesConfiguring a routing policyDefining a continue clauseDefining filtersPrerequisitesBefore configuring this task, you must determine IP-prefix list name, matching address range, andextcommunity list sequence number.Defining 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 prefix listip ip-prefix ip-prefix-name [ index index-number ]{ deny | permit } ip-address mask-length[ greater-equal min-mask-length ] [ less-equalmax-mask-length ]RequiredNot defined by default.NOTE:If all the items are set to the deny mode, no routes can pass the IPv4 prefix list. You must define the permit0.0.0.0 0 less-equal 32 item following multiple deny items to allow other IPv4 routing information to pass.For example, the following configuration filters routes 10.1.0.0/16, 10.2.0.0/16, and 10.3.0.0/16, butallows other routes to pass. system-view
