Virtual Private LAN Service (VPLS) provides Layer 2 VPN connectivity over MPLS. Each Provider Edge (PE) device must learn and maintain MAC addresses per virtual instance.
PE Scalability is the primary concern: With 2000 VLANs, each PE participating in those instances must maintain a large forwarding table and handle associated control-plane activity.
MAC learning and aging, along with full-mesh label-switched paths (LSPs), place a heavy burden on CPU and memory.
Flooding (A) is expected but not the primary concern; it’s a symptom of scale.
The underlying transport (C) and VLAN ID limits (D) are important but not as critical in the context of PE resource scalability.
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