H3C S5500-SI Series Operation Manual

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Operation Manual – IPv6 RoutingH3C S5500-SI Series Ethernet Switches Chapter 3 Routing Policy Configuration3-2II. IP prefix listIP-prefix list plays a role similar to ACL, but it is more flexible than ACL and easier tounderstand. When IP-prefix list is applied for routing information filtering, its matchingobject is the destination address information field of routing information.An IP-prefix list is identified by the IP-prefix list name. Each IP-prefix list can comprisemultiple items, and each item, which is identified by an index number, can specify amatching range in network prefix format. The index number indicates the matchingsequence in the IP-prefix list.During matching, a router checks list items identified by index number in the ascendingorder. If one item matched, the IP-prefix list filtering is passed, without needing to matchthe next item.III. Routing policyA routing policy is used for matching some attributes in given routing information andmodifying the attributes of the information if matching conditions are satisfied. A routingpolicy can utilize the above filters to define its own matching rules.A routing policy can comprise multiple nodes, which are in logic OR relationship. Eachnode is a matching unit, and the system checks nodes in the order of node sequencenumber. Once the matching test of a node is passed, the route-policy is passed withoutneeding to match other nodes.Each node comprises a set of if-match and apply clauses. The if-match clausesdefine the matching rules. The matching objects are some attributes of routinginformation. The different if-match clauses on the same node is in logic ANDrelationship. Only when the matching conditions specified by all the if-match clauseson a node are satisfied, can routing information passes the matching test of the node.The apply clauses specify the actions performed after the node matching test passed,concerning the attribute settings for the routing information.3.1.3 Routing Policy ApplicationRouting policy applies in two ways:z When redistributing routes from other routing protocols, a routing protocolredistributes only routes matching rules defined in a routing policy.z When receiving or advertising routing information, a routing protocol uses arouting policy to filter routing information.3.2 Defining Filtering Lists3.2.1 PrerequisitesBefore configuring this task, prepare the following data:

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