Technical data

BLADE OS 5.1 Application Guide
BMD00136, November 2009 Chapter 10: Border Gateway Protocol
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Precedence
You can set a priority to a route map by specifying a precedence value with the following command
(Route Map mode):
The smaller the value the higher the precedence. If two route maps have the same precedence value,
the smaller number has higher precedence.
Configuration Overview
To configure route maps, you need to do the following:
1. Define a network filter.
Enter a filter number from 1 to 256. Specify the IP address and subnet mask of the network that you
want to match. Enable the network filter. You can distribute up to 256 network filters among 32
route maps each containing eight access lists.
2. (Optional) Define the criteria for the access list and enable it.
Specify the access list and associate the network filter number configured in Step 1.
Steps 2 and 3 are optional, depending on the criteria that you want to match. In Step 2, the network
filter number is used to match the subnets defined in the network filter. In Step 3, the autonomous
system number is used to match the subnets. Or, you can use both (Step 2 and Step 3) criteria:
access list (network filter) and access path (AS filter) to configure the route maps.
3. (Optional) Configure the AS filter attributes.
>> # precedence <1-255> (Specify a precedence)
>> # ip match-address 1 address <IP address> <subnet mask>
>> # ip match-address 1
enable
>> # route-map 1
>> (config-route-map)# access-list 1 match-address 1
>> (config-route-map)# access-list 1 metric <metric value>
>> (config-route-map)# access-list 1 action deny
>> (config-route-map)# access-list 1 enable
>> (config-route-map)# as-path-list 1 as 1
>> (config-route-map)# as-path-list 1 action deny
>> (config-route-map)# as-path-list 1 enable