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Figure 60 AS number substitution configuration (in an IPv4 network)
For example, as shown in Figure 60, CE 1 and CE 2 use the same AS number 800. To ensure
bidirectional communication between the two sites, configure AS number substitution on PE 2. PE 2
replaces AS 800 with AS 100 for the BGP route update originated from CE 1 before advertising it to
CE 2. Perform the same configuration on PE 1.
To configure AS number substitution for a peer or peer group (IPv4):
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance
view:
a. bgp as-number
b. ip vpn-instance
vpn-instance-name
N/A
3. Configure AS number
substitution for a peer or peer
group.
peer
{ group-name | ip-address
[ mask-length ] }
substitute-as
By default, AS number
substitution is not configured.
To configure AS number substitution for a peer or peer group (IPv6):
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance
view:
a. bgp as-number
b. ip vpn-instance
vpn-instance-name
N/A
3. Configure AS number
substitution for a peer or peer
group.
peer
{ group-name | ipv6-address
[ prefix-length ] }
substitute-as
By default, AS number
substitution is not configured.
Removing private AS numbers from updates sent to an EBGP peer or peer group
Private AS numbers are typically used in test networks, and should not be transmitted in public
networks. The range of private AS numbers is from 64512 to 65535.
To remove private AS numbers from updates sent to an EBGP peer or peer group (IPv4):
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