H3C Technologies H3C S6800 Series Switches - Manual (Page 387)

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Figure 98 UPE dual homing and redundancy in H-VPLS using MPLS access
The backup U-PW is used in the following scenarios:
• The primary U-PW goes down because the tunnel that carries the primary U-PW is deleted or a fault
detection mechanism such as BFD detects the tunnel failure.
• The primary U-PW is deleted by the control plane. For example, the LDP session on the primary
U-PW link is down, causing the primary U-PW to be deleted.
• BFD detects a failure of the primary U-PW.
• A primary and backup U-PW switchover is triggered by a command.
H3C recommends executing the port bridge enable command on the NPE 1' interface connected to NPE
4 when the following conditions are met:
• The MPLS network (edge domain) is configured with a fast switchover mechanism, for example, LDP
FRR or MPLS TE FRR.
• A primary tunnel is established over the link UPE—NPE 1, and a backup tunnel is established over
the link UPE—NPE 4—NPE 1.
When the primary tunnel fails, traffic will be immediately switched to the backup tunnel. The failover time
is so short that the U-PW switchover from primary to backup might not be triggered. In this scenario, NPE
1 needs to forward traffic received from NPE 4 to NPE 4, NPE 3, and NPE 2 in the backbone domain.
To ensure correct forwarding, execute the port bridge enable command on the NPE 1' interface
connected to NPE 4. Then, NPE 1 can send traffic received on the interface out of the interface itself.
VPLS configuration task list
To configure a VPLS network, perform the following tasks:
• Configure an IGP to ensure IP connectivity within the backbone network.
• Configure basic MPLS, LDP, GRE, or MPLS TE to establish public tunnels on the backbone network.
• Configure VPLS on PEs. For example, configure a VSI, establish a PW, and associate an AC and a
VSI.
This chapter describes only VPLS configurations on a PE. For more information about other configurations,
see relevant configuration guides.
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