HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Routing Confi - Page 263
Configuring routing policies, Introduction to routing policy, Routing policy application, Filters, ACL
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Configuring routing policies Introduction to routing policy Routing policies are used to receive, advertise, and redistribute only specific routes and modify the attributes of some routes. Routing policy in this chapter involves both IPv4 routing policy and IPv6 routing policy. A routing policy is used to filter routes when they are received, advertised, or redistributed and modify the attributes of some routes. Routing policy application A routing policy has the following applications: • Filters advertised routes. • Filters received routes. • Filters redistributed routes. • Modifies or sets the attributes of some routes. Routing policy implementation To configure a routing policy, you must do the following: 1. Define some filters based on the attributes of routing information, such as destination address, and the advertising router's address. 2. Apply the filters to the routing policy. You can use multiple filters to define match criteria. For more information, see "Filters." Filters You can use the following types of filters: ACL, IP prefix list, AS path list, community list, extended community list, and routing policy. ACL ACL involves IPv4 ACL and IPv6 ACL. An ACL is configured to match the destinations or next hops of routing information. For more information about ACL, see ACL and QoS Configuration Guide. IP prefix list IP prefix list involves IPv4 prefix list and IPv6 prefix list. An IP prefix list is configured to match the destination address of routing information. You can use the gateway option to allow only routing information from certain routers to be received. For gateway option information, see "Configuring RIP" and "Configuring OSPF." 253
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