Integrating PBB with EVPN

The integration of provider backbone bridging (PBB) with Ethernet VPN (EVPN) is supported. With PBB-EVPN, the control plane learning across the core is significantly reduced, allowing a huge number of Layer 2 services, such as data center connectivity, to transit the network in a simplified manner. In a PBB-EVPN network, the backbone core bridge (BCB) device in the PBB core is replaced with MPLS, while retaining the service scaling properties of the PBB backbone edge bridge (BEB). The B-component (provider routing instance) is signaled using EVPN BGP signaling and encapsulated inside MPLS using provider edge (PE) and provider (P) devices. Thus, PBB-EVPN combines the vast scaling property of PBB with the simplicity of a traditional basic MPLS core network, resulting in significant reduction in the amount of network-wide state information, as opposed to regular PBB.