3.14.1 Establishing the Configuration Task
Before configuring an RR to optimize the VPN backbone layer, familiarize yourself with the
applicable environment, complete the pre-configuration tasks, and obtain the required data. This
can help you complete the configuration task quickly and accurately.
Applicable Environment
The BGP speaker does not advertise the routes learned from IBGP devices to its IBGP peers.
To make a PE advertise the routes of the VPN that the PE accesses to the BGP VPNv4 peers in
the same AS, the PE must establish IBGP connections with all peers to directly exchange VPN
routing information. That is, MP IBGP peers must establish full connections between each other.
Suppose there are n PEs (including ASBRs) in an AS, n (n-1)/2 MP IBGP connections need to
be established. A large number of IBGP peers consume a great amount of network resources.
The Route Reflector (RR) can solve this problem. In an AS, one switch can be configured as the
RR to reflect VPNv4 routes and the other PEs and ASBRs serve as the clients, which are called
Client PEs. An RR can be a P, PE, ASBR, or a switch of other types.
The introduction of the RR reduces the number of MP IBGP connections. This lightens the
burden of PEs and facilitates network maintenance and management.
Pre-configuration Tasks
Before configuring route reflection to optimize the VPN backbone layer, complete the following
tasks:
l
Configuring the routing protocol for the MPLS backbone network to implement IP
interworking between switchs in the backbone network
l
Establishing tunnels (LSPs or MPLS TE tunnels) between the RR and all Client PEs
Data Preparation
To configure the BGP VPNv4 route reflection, you need the following data.
No.
Data
1
Local AS number and peer AS number
2
Type and number of the interfaces used to set up the TCP connection
3
BGP peer group name and IP addresses of peers
3.14.2 Configuring the Client PEs to Establish MP IBGP
Connections with the RR
An MP-IBGP connection is configured between the PE and the RR to facilitate VPNv4 route
reflection.
Context
Do as follows on all Client PEs:
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15)
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