Route Policy Application; Route Policy Configuration Task List; Defining Filters; Prerequisites - H3C S5500-SI Series Operation Manual

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An IP prefix list is configured to match the destination address of routing information. Moreover, you can

use the gateway option to allow only routing information from certain routers to be received. For

gateway option information, refer to RIP Commands in the IP Routing Volume.

An IP prefix list, identified by name, can comprise multiple items. Each item, identified by an index

number, can specify a prefix range to match. An item with a smaller index number is matched first. If one

item is matched, the IP prefix list is passed, and the packet will not go to the next item.

Route policy

A route policy is used to match routing information and modify the attributes of permitted routes. It can

reference the above mentioned filters to define its own match criteria.

A route policy can comprise multiple nodes, which are in logic OR relationship. Each route policy node

is a match unit, and a node with a smaller number is matched first. Once a node is matched, the route

policy is passed and the packet will not go to the next node.

A route policy node comprises a set of if-match and apply clauses. The if-match clauses define the

match criteria. The matching objects are some attributes of routing information. The if-match clauses of

a route policy node is in logical AND relationship. That is, a packet must match all the if-match clauses

of the node to pass it. The apply clauses of the node specify the actions to be taken on the permitted

packets, such as route attribute modification.

Route Policy Application

A route policy is applied on a router to filter routes when they are received, advertised or redistributed

and to modify some attributes of permitted routes.

Complete the following tasks to configure a route policy:

Configuring a Route Policy

Defining Filters

Before configuring this task, you need to decide on:

IP-prefix list name

Matching address range

Defining an IP-prefix List

Creating a Route Policy

Defining if-match Clauses

Defining apply Clauses

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