HP HPE FlexNetwork 7500 series Configuration Manual page 279

Figure 65 AS number substitution configuration (in an IPv4 network)
EBGP_Update: 10.1.0.0/16
AS_PATH: 800
CE 1
AS 800
As shown in Figure 65, 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 unicast/multicast address family):
Step
1. Enter system view.
2. Enter BGP instance view or
BGP-VPN instance view.
3. Configure AS number
substitution for a peer or peer
group.
To configure AS number substitution for a peer or peer group (IPv6 unicast/multicast address family):
Step
1. Enter system view.
2. Enter BGP instance view or
BGP-VPN instance view.
3. Configure AS number
substitution for a peer or peer
group.
AS 100
PE 1
MPLS backbone
VPNv4_Update: 10.1.0.0/16
RD: 100:1
AS_PATH: 800
Command
system-view
•
Enter BGP instance view:
bgp as-number [ instance
instance-name ]
•
Enter BGP-VPN instance
view:
a. bgp as-number
[ instance
instance-name ]
b. ip vpn-instance
vpn-instance-name
peer { group-name | ipv4-address
[ mask-length ] } substitute-as
Command
system-view
•
Enter BGP instance view:
bgp as-number [ instance
instance-name ]
•
Enter BGP-VPN instance
view:
a. bgp as-number
[ instance
instance-name ]
b. ip vpn-instance
vpn-instance-name
peer { group-name | ipv6-address
[ prefix-length ] } substitute-as
267
PE 2
EBGP_Update: 10.1.0.0/16
AS_PATH: 100, 100
CE 2
AS 800
Remarks
N/A
N/A
By default, AS number
substitution is not configured.
Remarks
N/A
N/A
By default, AS number
substitution is not configured.