HP FlexFabric 12900E Series Configuration Manual page 265

Figure 62 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 62, 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
substitution for a peer or peer
group.
To configure AS number substitution for a peer or peer group (IPv6 unicast address family):
Step
1. Enter system view.
2. Enter BGP instance view or
BGP-VPN instance view.
3. Configure AS
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
[ multi-session-thread ]
•
Enter BGP-VPN
view:
a. bgp
[
instance-name
[ multi-session-thread ]
b. ip
vpn-instance-name
number
peer { group-name | ipv4-address
[ mask-length ] } substitute-as
Command
system-view
•
Enter BGP instance view:
bgp as-number [ instance
instance-name
[ multi-session-thread ]
•
Enter BGP-VPN
view:
a. bgp
[
instance-name
[ multi-session-thread ]
b. ip
vpn-instance-name
number
peer { group-name | ipv6-address
[ prefix-length ] } substitute-as
253
PE 2
EBGP_Update: 10.1.0.0/16
AS_PATH: 100, 100
CE 2
AS 800
Remarks
N/A
]
instance
N/A
as-number
instance
]
vpn-instance
By default,
substitution is not configured.
Remarks
N/A
]
instance
N/A
as-number
instance
]
vpn-instance
By default,
substitution is not configured.
AS number
AS number