VPLS is implemented in a Layer 2 network with 2000 VLANs. What is the primary concern to ensure successful deployment of VPLS?

Flooding for unknown MAC reachability is an inherent and expected behavior in VPLS operation, not a deployment concern - it is accounted for in the protocol design and does not represent a scalability blocker.

Each VPLS instance on a PE router requires its own MAC address forwarding table, pseudowire signaling state, and hardware forwarding entries. Multiplying this across 2000 VLANs places extreme demands on PE router memory and CPU, and can exhaust hardware CAM/TCAM tables. Validating that PE devices can support 2000 simultaneous VPLS instances is therefore the critical prerequisite for a successful large-scale deployment.

The underlying MPLS transport is a prerequisite resolved during network design before VPLS is layered on top; at the 2000-VLAN scale the transport itself is not the limiting factor.

VLAN scalability is a real consideration, but in this context the 2000-VLAN challenge directly translates into 2000 VPLS instances on each PE, so PE scalability is the more precise and primary concern.