VPLS Multi-Homing Application
On VPLS networks, carriers usually dual-home CE2 to PE1 and PE2 through redundant links to deliver high-reliability services. To prevent routing loops caused by link redundancy, VPLS multi-homing can be configured on PE1 and PE2.
On the network shown in Figure 1, an MPLS backbone network is deployed to provide VPLS services for enterprise users. CE1 is single-homed to PE1, CE2 is dual-homed to PE1 and PE2, and CE3 is single-homed to PE3. VPLS multi-homing can be configured so that PE1 and PE2 will assign the same multi-homing site ID to CE2. A preferred PE is then selected for PW establishment. PE1, PE2, and PE3 can establish PWs between each other to allow communication between CE1, CE2, and CE3.
Feature Deployment
- Deploy IP and an IGP on the carrier network to ensure reachability between the PEs and Ps at the network layer.
- Deploy MPLS on the carrier network and establish LDP LSPs or TE LSPs between the PEs.
- Deploy BGP between the PEs.
- Deploy VPLS on the PEs, create a VSI for each user, and bind a user-side interface to the L2VPN.
- Allow each PE to assign a site and priority to each CE.