3Com Switch 8800 Family Configuration Guide

Typical BGP/MPLS VPN Configuration Example 565
[PE3-bgp-af-vpn-instance] import-route static
[PE3-bgp-af-vpn-instance] import-route direct
[PE3-bgp-af-vpn-instance] group 172 external
[PE3-bgp-af-vpn-instance] peer 172.18.1.1 group 172 as-number 65001
[PE3-bgp-af-vpn-instance] quit
[PE3-bgp] quit
# Bind the interface of the VLAN to which the port connecting PE3 and CE3
belongs to VPN-instance.
[PE3] vlan 201
[PE3-vlan201] port gigabitethernet 2/1/1
[PE3-vlan201] quit
[PE3] interface Vlan-interface 201
[PE3-Vlan-interface201] ip binding vpn-instance vpn-instance2
[PE3-Vlan-interface201] ip address 172.18.0.1 255.255.0.0
[PE3-Vlan-interface201] quit
# Configure Loopback interface
[PE3] interface loopback 0
[PE3-LoopBack0] ip address 33.1.1.1 255.255.255.255
[PE3-LoopBack0] quit
# Set up MP-IBGP adjacency between PE3 and PE1 to exchange inter-PE VPN
routing information and activate MP-IBGP peer in VPNv4 sub-address family view.
[PE3] bgp 100
[PE3-bgp] group 11
[PE3-bgp] peer 11.1.1.1 group 11
[PE3-bgp] peer 11.1.1.1 connect-interface loopback 0
[PE3-bgp] ipv4-family vpnv4
[PE3-bgp-af-vpn] peer 11 enable
[PE2-bgp-af-vpn] peer 11.1.1.1 group 11
[PE2-bgp-af-vpn] peer 11.1.1.1 allow-as-loop 1
[PE3-bgp-af-vpn] quit
[PE3-bgp] quit
CE Dual-home
Configuration Example
Network requirements
For the applications which require high robustness of network, you may use CE
dual-home networking mode.
CE1 and CE2 are dual-homed; they are connected to both PE1 and PE2. Three PEs
are connected to each other so the links between them are backed up. CE3 and
CE4 are single-homed; each of them is only connected to one PE.
CE1 and CE3 are in one VPN, and CE2 and CE4 are in another VPN. The two VPNs
cannot intercommunicate with each other.