3Com S7906E - Switch, Configuration Manual

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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.
Route Policy Configuration Task List
Complete the following tasks to configure a route policy:
Task
Defining an IP-prefix List
Defining an AS Path List
Defining a Community List
Defining Filters
Defining an Extended Community List
Creating a Route Policy
Defining if-match Clauses Configuring a Route Policy
Defining apply Clauses
Defining Filters
Prerequisites
Before configuring this task, you need to decide on:
z
IP-prefix list name
z
Matching address range
z
Extcommunity list sequence number
Defining an IP-prefix List
Define an IPv4 prefix list
Identified by name, an IPv4 prefix list can comprise multiple items. Each item specifies a prefix range to
match and is identified by an index number.
An item with a smaller index number is matched first. If one item is matched, the IP prefix list is passed,
and the routing information will not go to the next item.
Follow these steps to define an IPv4 prefix list:
To do… Use the command… Remarks
Enter system view system-view
—
Define an IPv4 prefix
list
ip ip-prefix ip-prefix-name [ index
index-number ] { deny | permit } ip-address
mask-length [ greater-equal min-mask-length ]
[ less-equal max-mask-length ]
Required
Not defined by default.