H3C Technologies H3C S12500-X Series Switches - Manual (Page 163)

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Configure MPLS L3VPN inter-AS option A, and use the VRF-to-VRF method to manage VPN routes.
Run OSPF on the MPLS backbone in each AS.
Figure 49 Network diagram
Device Interface IP address Device Interface IP address
CE 1 Vlan-int12 10.1.1.1/24 CE 2 Vlan-int12 10.2.1.1/24
PE 1 Loop0 1.1.1.9/32 PE 2 Loop0 4.4.4.9/32
Vlan-int12 10.1.1.2/24 Vlan-int12 10.2.1.2/24
Vlan-int11 172.1.1.2/24 Vlan-int11 162.1.1.2/24
ASBR-PE 1 Loop0 2.2.2.9/32 ASBR-PE 2 Loop0 3.3.3.9/32
Vlan-int11 172.1.1.1/24 Vlan-int11 162.1.1.1/24
Vlan-int12 192.1.1.1/24 Vlan-int12 192.1.1.2/24
Configuration procedure
1. Configure IGP on the MPLS backbone to implement the connectivity in the backbone:
This example uses OSPF. (Details not shown.)
After the configurations, each ASBR-PE and the PE in the same AS can establish OSPF adjacencies.
Execute the display ospf peer command. The output shows that the adjacencies are in Full state,
and that PEs can learn the routes to the loopback interfaces of each other.
Each ASBR-PE and the PE in the same AS can ping each other.
2. Configure basic MPLS and MPLS LDP on the MPLS backbone to establish LDP LSPs:
# Configure basic MPLS on PE 1, and enable MPLS LDP on the interface connected to ASBR-PE 1.
system-view
[PE1] mpls lsr-id 1.1.1.9
[PE1] mpls ldp
[PE1-ldp] quit
[PE1] interface vlan-interface 11
[PE1-Vlan-interface11] mpls enable
[PE1-Vlan-interface11] mpls ldp enable
[PE1-Vlan-interface11] quit
Loop0 Loop0
Loop0 Loop0
Vlan-int12
CE 1 CE 2
AS 65001 AS 65002
PE 1 PE 2
ASBR-PE 2 ASBR-PE 1
MPLS backbone MPLS backbone
AS 100 AS 200
Vlan-int12 Vlan-int12
Vlan-int12
Vlan-int11
Vlan-int11
Vlan-int12 Vlan-int12
Vlan-int11
Vlan-int11