3Com 8807 Configuration Manual page 581

Hierarchical BGP/MPLS
VPN Configuration
Example
n
[ASBR-PE2-bgp] peer 20 route-policy rtp-ibgp export
[ASBR-PE2-bgp] peer 202.200.1.2 group 20
[ASBR-PE2-bgp] peer 202.200.1.2 connect-interface loopback0
Network requirements
For those VPNs that have distinct hierarchy, an MPLS VPN covering a province and
its cities, for example, incorporating the backbone network at the province level
and the networks at the city level into a single MPLS VPN will impose a high
requirement in performance on the equipment on the entire network, in the event
that the network topology size is large. However, the requirement in equipment
performance can become lower if this MPLS VPN is separated into two VPNs, the
network at the province level and the network at the city level, for example.
SPE acts as a PE on the network at the province level, and is connected with a
downstream MPLS VPN at the city level. UPE acts as a PE on the network at the
city level and provide access service for the VPN clients which are normally low-end
routers.
Network diagram
Figure 140 Network diagram for hierarchical BGP/MPLS VPN
Upper VPN Upper VPN
VLAN301 VLAN301 VLAN301 VLAN301
10.0.0.2/8 10.0.0.2/8 10.0.0.2/8 10.0.0.2/8
Lower VPN Lower VPN
UPE UPE UPE UPE
VPN1 Sit e1 VPN1 Sit e1 VPN1 Sit e1 VPN1 Sit e1
CE CE CE CE
Configuration procedure
This case only illustrates the configurations concerned with PEs in a hierarchical
BGP/MPLS VPN.
1 Configure SPE
# Configure the basic MPLS capability.
[SPE] mpls lsr-id 1.0.0.2
[SPE] mpls
[SPE-mpls] quit
[SPE] mpls ldp
Typical BGP/MPLS VPN Configuration Example
PE PE PE PE
MPLS backbone MPLS backbone
MPLS MPLS
VLAN201 VLAN201 VLAN201 VLAN201
Loopbac k0:10.0.0.2 Loopbac k0:10.0.0.2 Loopbac k0:10.0.0.2 Loopbac k0:10.0.0.2
10.0.0.1/8 10.0.0.1/8 10.0.0.1/8 10.0.0.1/8
SPE SPE SPE SPE
Loopbac k0:1.0.0.1 Loopbac k0:1.0.0.1
VPN2 Sit e1 VPN2 Sit e1 VPN2 Sit e1 VPN2 Sit e1
VPN1 Sit e1 VPN1 Sit e1 VPN1 Sit e1 VPN1 Sit e1
CE CE CE CE
PE PE PE PE
UPE UPE UPE UPE
VPN2 Sit e1 VPN2 Sit e1 VPN2 Sit e1 VPN2 Sit e1
CE CE CE CE CE CE CE CE
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