The solution shown in VPLS EAPS Redundancy Overview has the following requirements and limitations:
The redundant VPLS nodes must be core nodes.
An EAPS common link is required between the redundant VPLS nodes.
The redundant VPLS nodes (Core 1 and Core 2) use PWs to connect to each other and the other core nodes (Core 3 and Core 4).
The redundant VPLS nodes use PWs to support the EAPS-protected VLANs, not the EAPS common link.
Works only with EAPS customer attachment ring.
The EAPS master should not be on a VPLS node.
EAPS state used by VPLS to control state of PWs (Active/Ready).
EAPS monitors common link state and ring state.
VPLS on controller node uses EAPS state to set Active/Ready PWs.
EAPS blocks customer-facing ports as normal.