As shown in Figure 3-18, PE1, PE2, P1, and P2 are on the backbone network AS100. CE1 and
CE2 belong to VPNA. Select P1 and P2 as the RRs of the VPN.
Configuration Roadmap
The configuration roadmap is as follows:
1. Set up MP-IBGP adjacencies between the PEs and RRs.
2. Set up EBGP adjacencies between the PE and CEs.
3. Enable MPLS LSP on the public tunnel and enable MPLS LDP on the devices and interfaces
along the tunnel.
4. Configure P1 and P2 to be the backup of each other and configure the same RR ID for them.
5. P1 and P2 need to store all VPNv4 routing information and advertise the routing information
to PEs, so configure P1 and P2 to accept all the VPNv4 routing information without filtering
the routing information based on VPN targets.
NOTE
At least two paths that do not use the same network segment and node must exist between the RR and PE;
otherwise, the double RRs are unnecessary.
Data Preparation
To complete the configuration, you need the following data:
l ID of the VLAN that each interface belongs to and IP address of each interface, as shown
in Figure 3-18
l MPLS LSR-IDs of PE and ASBR-PEs
l Names, RDs, and VPN targets of the VPN instances created on PE1 and PE2
l Routing protocol used to exchange routing information between the PE and CEs (EBGP is
used in this example)
l Convergence priorities of the routes in the VPN instances
l Name of the RD and name of the routing policy
Procedure
1. Configure the VLAN on each interface. The configuration procedure is not given here.
2. Configure an IGP protocol on the MPLS backbone network to implement interworking of
devices along the LSP.
OSPF is used as the IGP protocol in this example. The configuration procedure is not given
here.
NOTE
The address of the loopback interface, which functions as the LSR ID, must be advertised.
After the configuration, devices along the LSP can learn the address of the loopback
interface of each other.
Take PE1 for example.
<PE1> display ip routing-table
Route Flags: R - relied, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 19 Routes : 21
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
312
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