as-number

Function

The as-number command configures an AS number for a VPN instance.

The undo as-number command restores the default setting.

By default, a VPN instance uses the AS number of BGP.

Format

as-number vrf-as

undo as-number

Parameters

Parameter	Description	Value
vrf-as	Specifies the number of an AS.	For an integral AS number, the value is an integer ranging from 1 to 4294967295. For an AS number in dotted notation, the value is in the format of x.y, where x is an integer that ranges from 1 to 65535, and y is an integer ranging from 0 to 65535.

Parameter

Description

Value

vrf-as

Specifies the number of an AS.

For an integral AS number, the value is an integer ranging from 1 to 4294967295.

For an AS number in dotted notation, the value is in the format of x.y, where x is an integer that ranges from 1 to 65535, and y is an integer ranging from 0 to 65535.

Views

BGP-VPN instance IPv4 address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

During network transfer or service identification, a device needs to be simulated as multiple BGP devices logically. In this case, you can run the as-number command to configure an AS number for each VPN instance.

After the as-number command is used:

BGP peer relationships in the VPN instance are established by using the configured AS number.
The configured AS number is used to generate the aggregator attribute during route aggregation.
When advertising routes to an external border gateway protocol (EBGP) peer, the local device carries the AS number configured in the VPN instance.

Prerequisites

If a BGP peer or a BGP peer group is configured in the VPN instance, you need to delete the configuration of the BGP peer or peer group before configuring or deleting an AS number.

Precautions

If a VPN instance has been configured with an independent AS number, no confederation can be configured. When configuring a confederation, you cannot configure an independent AS number for a VPN instance.

The independent AS number configured in the VPN instance view cannot be the same as the AS number configured in the BGP view.

This command cannot be configured in the BGP YANG management mode. To configure an independent AS number for the VPN instance IPv4 address family, run the as-number ipv4 ipv4-as command in the BGP-VPN instance view.

Example

# Set the AS number of the VPN instance named vpn1 to 65001.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpn1
[*HUAWEI-vpn-instance-vpn1] ipv4-family
[*HUAWEI-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1
[*HUAWEI-vpn-instance-vpn1-af-ipv4] quit
[*HUAWEI-vpn-instance-vpn1] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv4-family vpn-instance vpn1
[*HUAWEI-bgp-vpn1] as-number 65001