Hub-Spoke Vpls Implementation - H3C SR8800 10G Mpls Configuration Manual

PW redundancy
The network design with a single PW between a UPE and an NPE has a distinct drawback: once the PW
experiences a failure, all VPNs connected to the aggregate device will lose connectivity. The H-VPLS with
LSP access provides redundant links for PW backup. Normally, only the primary PW link is used. When
the main link fails, the backup link takes over the VPN services.
Figure 39 Backup link for H-VPLS with LSP access
CE 1
CE 2
(Backup link)
The H-VPLS with LSP access activates the backup link when:
The tunnel over which the primary PW is established is deleted, causing the PW to go down.
•
BFD detects a primary link failure.
•
• The LDP session between the peers of the primary PW goes down, and the PW is deleted as a
result.

Hub-spoke VPLS implementation

In hub-spoke networking, one of the VPLS networking modes, there is one hub site and multiple spoke
sites. The spoke sites (the spoke-CEs) are not permitted to communicate with each other directly; data
transmission between them depends on the hub site (the hub-CE). The PE connecting the hub site is called
the "hub-PE." The PEs connecting the spoke sites are called "spoke-PEs."
Advantages of hub-spoke networking
In hub-spoke networking, all traffic between spoke sites must go through the hub site, facilitating
centralized management of traffic.
NPE 1
N-PW
U-PW
UPE
N-PW
N-PW
U-PW
NPE 2
NPE 3
CE 3
159