# Configuring an AS path list

Use this procedure to configure an AS path list to restrict the routing information a router learns or advertises to and from a neighbor. The AS path list acts as a filter that matches AS paths.

## Procedure

1. In the navigation tree, open the following folders: Configuration > IP.
2. Click Policy.
3. Click the As Path List tab.
4. Click Insert.
5. Enter the appropriate information for your configuration.
6. Click Insert.

## As Path List field descriptions

Use the data in the following table to use the As Path List tab.

Name | Description
--- | ---
Id | Specifies the AS path list. The range is 0–1024.
MemberId | Specifies the AS path access list member ID. The range is 0–65535.
Mode | Specifies the action to take if the system selects a policy for a specific route. Select permit (allow the route) or deny (ignore the route).
AsRegularExpression | Specifies the expression to use for the AS path.