The peer as-path-filter export command configures a policy based on an AS_Path list for filtering BGP routes to be advertised to a specified peer group.
The undo peer as-path-filter export command cancels this configuration.
By default, no policy based on an AS_Path list is configured for filtering BGP routes to be advertised to a peer group, and all the BGP routes will be advertised to the peer group.
| Parameter | Description | Value |
|---|---|---|
| group-name |
Specifies the name of a peer group. |
The name is a string of 1 to 47 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| number |
Specifies the number of an AS_Path filter. |
The value is an integer ranging from 1 to 256. |
| name |
Specifies the name of an AS_Path filter. |
The value is a string of 1 to 51 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
Usage Scenario
After the peer as-path-filter export command is used to apply a route filtering policy based on an AS_Path list to BGP routes to be advertised to a specified peer group, the routers that do not match the policy are filtered out.
Prerequisites
The ip as-path-filter command has been run to define an AS-Path filter.
Precautions
Only one AS_Path filter can be used to filter routes to be advertised to the same peer.
The peer as-path-filter export command is mutually exclusive with the peer route-filter export commands.