QinQ, LACP, MSTP), network overlays (VXLAN, MPLS), IP multicast (IGMP, PIM), and vBNG functions (subscriber management, PPPoE/IPoE, QoS enforcement), including design, configuration, and troubleshooting. Support client lab integration, testing, qualification, field trials, and production deployments of our access network platform; train clients on system operation and troubleshooting.