H3C Technologies H3C S7500E Series Switches - Manual (Page 168)

4-8
Figure 4-5 Backup link for H-VPLS LSP access
CE 3 NPE 3
N-PW
NPE 1
N-PW
N-PW
CE 1
CE 2
NPE 2
UPE
U-PW
(Backup link)
U-PW
The H-VPLS in LSP access mode determines the validity of the main link according to the LDP
session status and BFD checking result. It activates the backup link when:
z
The tunnel over which the main PW is established is deleted, causing the PW to go down.
z
BFD detects a main link failure.
z
The LDP session between the peers of the main PW goes down, and the PW is deleted as a
result.
VPLS Configuration Task List
Complete the following tasks to configure VPLS:
Task Remarks
Enabling MPLS L2VPN Required
Configuring an LDP VPLS Instance Required Configuring LDP VPLS
Binding an LDP VPLS Instance Required
Configuring the BGP Extension Required
Enabling MPLS L2VPN Required
Configuring a BGP VPLS Instance Required
Configuring BGP VPLS
Binding a BGP VPLS Instance Required
Configure either
type of VPLS as
needed
Configuring VPLS Instance Attributes Optional
Configuring LDP VPLS
Configuration Prerequisites
z
Configure IGP on the MPLS backbone devices (PEs and P devices) to guarantee the IP
connectivity of the MPLS backbone. For configuration details, see Layer 3 - IP Routing
Configuration Guide .
z
Configure MPLS basic capability on the MPLS backbone devices (PEs and P devices) to
establish LSP tunnels on the backbone network. For configuration information, see MPLS Basics
Configuration in the MPLS Configuration Guide.