peer ip-prefix export

Function

The peer ip-prefix export command configures a policy based on an IP prefix list for filtering BGP routes to be advertised to a specified peer.

The undo peer ip-prefix export command cancels this configuration.

By default, no route filtering policy based on an IP address prefix list is configured for a peer.

Format

peer ipv4-address ip-prefix ip-prefix-name export

undo peer ipv4-address ip-prefix [ ip-prefix-name ] export

Parameters

Parameter	Description	Value
ipv4-address	Specifies the IPv4 address of a peer.	It is in dotted decimal notation.
ip-prefix ip-prefix-name	specifies the name of an IP address prefix list.	The name is a string of 1 to 169 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.	-

Parameter

Description

Value

ipv4-address

Specifies the IPv4 address of a peer.

It is in dotted decimal notation.

ip-prefix ip-prefix-name

specifies the name of an IP address prefix list.

The name is a string of 1 to 169 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-MDT address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

The peer ip-prefix export command can be used to configure a route filtering policy that is based on an IP prefix list for filtering BGP routes to be advertised to a specified peer, implementing route control.

Prerequisites

If the peer ip-prefix command specifies an IP prefix list that does not exist for a peer, use the ip ip-prefix command to create an IP prefix list.

Configuration Impact

If an IP prefix list is specified for a peer group, all the members of the peer group inherit the configuration.

After an IP prefix list is specified for a peer, the peer filter the routes to be advertised to other peers based on the IP prefix list. Only the routes that pass the filtering of the IP prefix list can be advertised.

Precautions

If both this command and the peer route-filter export command are run, the latest configuration overrides the previous one.

If the length of the filter name is less than or equal to six characters and the name matches the first six characters of export or import, When you run the undo command, the filter name cannot be entered. You only need to enter the keyword import or export.

Example

# Configure a route filtering policy based on an IP prefix list.

<HUAWEI> system-view
[~HUAWEI] ip ip-prefix list1 permit 10.0.192.0 8 greater-equal 17 less-equal 18
[~HUAWEI] bgp 100
[*HUAWEI-bgp] peer 10.1.1.1 as-number 100
[*HUAWEI-bgp] ipv4-family mdt
[*HUAWEI-bgp-af-mdt] peer 10.1.1.1 enable
[*HUAWEI-bgp-af-mdt] peer 10.1.1.1 ip-prefix list1 export