User's Manual

40-25
Figure 40-5 Example of MPLS VPN
As the figure shows, for a typical MPLS VPN application, the public network region consists of PE1, P and
PE2, which MPLS is applied for packet transmission. VPN-A consists of CE-A1 and CE-A2, and VPN-B
consists of CE-B1 and CE-B2. These two VPNs are isolated from each other. PE1 and PE2 are edge routers
which are provided by the operators. CE-A1, CE-A2, CE-B1 and CE-B2 are the access switches on the user
side. PC1-PC4 indicate the network users. BGP runs at both the public and private network region. For the
public network region, VPN routing should be supported and the LOOPBACK interface should be used for
connections.
The sample configurations are listed as below.
Configurations on CE-A1
：
CE-A1#config
CE-A1(config)#interface vlan 2
CE-A1(config-if-Vlan2)#ip address 192.168.101.2 255.255.255.0
CE-A1(config-if-Vlan2)#exit
CE-A1(config)#interface vlan 1
CE-A1(config-if-Vlan2)#ip address 10.1.1.1 255.255.255.0
CE-A1(config-if-Vlan2)#exit
CE-A1(config)#router bgp 60101