peer as-path-filter export (BGP-IPv4 unicast address family view) (IPv6)

Function

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.

Format

peer peerIpv6Addr as-path-filter { number | name } export

undo peer peerIpv6Addr as-path-filter { number | name } export

Parameters

Parameter	Description	Value
peerIpv6Addr	Specifies the IPv6 address of a BGP peer.	The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
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.
export	Applies a filtering policy to the routes to be advertised to a peer.	-

Views

BGP-IPv4 unicast address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

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.

Example

# Configure an AS_Path filter for a peer.

<HUAWEI> system-view
[~HUAWEI] ip as-path-filter 3 permit 200
[*HUAWEI] bgp 100
[*HUAWEI-bgp] peer 2001:DB8:1::1 as-number 100
[*HUAWEI-bgp] ipv4-family unicast
[*HUAWEI-bgp-af-ipv4] peer 2001:DB8:1::1 enable
[*HUAWEI-bgp-af-ipv4] peer 2001:DB8:1::1 as-path-filter 3 export