3com 3031 Instruccion De Instalación

C

HAPTER

 43: IP R

OUTING

 P

OLICY

 C

ONFIGURATION

A routing protocol can import the routes discovered by other routing protocols to 
enrich its route information. When other protocol routing information is to be 
imported, the route-policy can be used for route information filtering to 
implement the purposeful redistribution. If the destination routing protocol 
importing the routes cannot directly reference the route costs of the source 
routing protocol, you should satisfy the requirement of the protocol by specifying 
a route cost for the imported route.

Perform the following configuration in routing protocol view.

By default, the routes discovered by other protocols will not be distributed.

An ip-prefix list is identified by the ip-prefix name. Each ip-prefix can include 
multiple items, and each item can independently specify the matching range of 
the network prefix forms. The index-number specifies the matching sequence in 
the ip-prefix list.

Perform the following configuration in System View.

During the matching, the router checks list items identified by the index-number in 
the ascending order. If only one list item meets the condition, it means that it has 
passed the ip-prefix filtering (will not enter the testing of the next list item).

Please note that if more than one ip-prefix item are defined, then the match mode 
of at least one list item should be the permit mode. The list items of the deny 
mode can be firstly defined to rapidly filter the routing information not satisfying 
the requirement, but if all the items are in the deny mode, any routes will not pass 
the ip-prefix filtering. You can define an item of permit 0.0.0.0/0 greater-equal 0 
less-equal 32 after the multiple list items in the deny mode so as to let all the other 
routes pass.

Table 675   Importing routes of other protocols

Set to import routes of other 
protocols

import-route protocol [ med med | cost cost 
] [ tag value ] [ type 1 | 2 ] [ 
route-policy route-policy-name ]

Cancel the setting for importing 
routes of other protocols

Table 676   Defining IP prefix list

Define IP prefix list

ip ip-prefix ip-prefix-name [ index 
index-number ] { permit | deny } network 
len [ greater-equal greater-equal | 
less-equal less-equal ]

Remove IP prefix list

undo ip ip-prefix ip-prefix-name [ index 
index-number | permit | deny ]