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.
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, and all the BGP routes will be advertised to the peer.
| Parameter | Description | Value |
|---|---|---|
| peerIpv4Addr |
Specifies the IP address of an MBGP peer. |
The address is in dotted decimal notation. |
| 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, 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, 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.<HUAWEI> system-view [~HUAWEI] bgp 100 [*HUAWEI-bgp] peer 1.1.1.1 as-number 10 [*HUAWEI-bgp] ipv4-family multicast [*HUAWEI-bgp-af-multicast] peer 1.1.1.1 enable [*HUAWEI-bgp-af-multicast] peer 1.1.1.1 as-path-filter 3 export