3com 5500-ei pwr Installation Instruction

 

5-1 

When configuring an IP route policy, go to these sections for information you are interested in: 

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IP Route Policy Configuration Task List  

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Displaying IP Route Policy 

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IP Route Policy Configuration Example 

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The term router in this chapter refers to a router in a generic sense or an Ethernet switch running a 

routing protocol. 

 

Route policy is technology used to modify routing information to control the forwarding path of data 

packets. Route policy is implemented by changing the route attributes such as reachability. 

When a router distributes or receives routing information, it may need to implement some policies to 

filter the routing information, so as to receive or distribute only the routing information meeting given 

conditions. A routing protocol (RIP, for example) may need to import the routing information discovered 

by other protocols to enrich its routing knowledge. While importing routing information from another 

protocol, it possibly only needs to import the routes meeting given conditions and control some 

attributes of the imported routes to make the routes meet the requirements of this protocol. 

For the implementation of a route policy, you need to define a set of matching rules by specifying the 

characteristics of the routing information to be filtered. You can set the rules based on such attributes as 

destination address and source address of the information. The matching rules can be set in advance 

and then used in the routing policies to advertise, receive, and import routes. 

A routing protocol can reference an ACL, IP-prefix, or route policy to filter routing information. The 

following sections describe these filters.