Configure an AS Number for a Non-default VRF

The Autonomous System (AS) number configured on the global Virtual Routing Forwarding (VRF) instance, called the GlobalRouter (GRT), is inherited by all user-created VRFs by default, however, you can override the AS number for the specific VRF instance using the following procedure.

Before you begin

Disable BGP synchronization.

Procedure

Enter VRF Router Configuration mode for a specific VRF context:

enable

configure terminal

router vrf WORD<1-16>
Set the AS number:

ip bgp vrf-as WORD<0-11>

Example

Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#router vrf vrfred
Switch:1(router-vrf)#ip bgp vrf-as 3

Variable Definitions

The following table defines parameters for the ip bgp vrf-as command.


Variable	Value
WORD<0-11>	Configures the local autonomous system (AS) number for the specific VRF instance. You cannot change local-as when BGP is set to enable. To configure a 2-byte local AS number, enter a local-as number in the range of 0 to 65535. To configure a 4-byte local-as number, enable the 4-byte as variable and enter a number in the range of 0 to 4294967295. Note: If as-4-byte is configured to false, the range for AS number is 0–65535 and if as-4-byte is configured to true, the range is 0–4294967295. If you enable as-dot, enter the AS number in octets in the range of 1.0 to 65535.65535. The AS number in a specific VRF instance inherits the AS number in the GlobalRouter in the following instances: Configuring the AS number in a specific VRF instance to 0 (ip bgp vrf-as 0) . Deleting the AS number in a specific VRF instance (no ip bgp vrf-as or default ip bgp vrf-as.