PBB VPLS introduction

Provider backbone bridge (PBB), a technique defined in IEEE 802.1ah, precedes customer MAC (C-MAC) addresses with backbone MAC (B-MAC) addresses in user packets to completely separate the user network from the carrier network. Unlike traditional E-LANs, a PBB network uses both public network and user MAC addresses. This implementation ensures network stability and reduces the number of MAC entries required on public network devices. In addition, PBB uses instance-virtual service instances (I-VSIs) identified by 24-bit IDs, which can identify more than 4K VLANs. This specification allows you to establish sufficient tunnels to transmit traffic over an Ethernet transport network.
VPLS is also known as transparent LAN service (TLS) or virtual private switched network service (VPSNS). VPLS is an L2VPN technology implemented based on the MPLS and Ethernet techniques.
PBB VPLS uses MAC-in-MAC instead of QinQ to transmit packets over a VPLS network, reducing the number of MAC entries that provider edges (PEs) must learn.

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