PBB frame forwarding

Figure 74: PBB frame forwarding

As shown in Figure 74, a PBB frame is forwarded in the PBBN as follows:

  1. BEB 1 encapsulates a customer frame with the corresponding B-MAC, B-VLAN, and I-SID. Then it forwards the frame to the BCB through its uplink port.

  2. BCB forwards the PBB frame from BEB 1 to BEB 2 according to the frame's B-MAC and B-VLAN.

  3. BEB 2 removes the PBB encapsulation, and then forwards the Ethernet frame out of the downlink port to the customer network.