The Nokia PBB implementation supports both MPLS and native Ethernet tunneling. In the case of an MPLS, SDP bindings are used as the B-VPLS infrastructure while T-LDP is used for signaling. As a result, the existing VPLS, MPLS diagnostic tools are supported in both I-VPLS and B-VPLS domains as depicted in Figure 1.
Figure 1. PBB OAM View for MPLS Infrastructure
When an Ethernet switching backbone is used for aggregation between PBB PEs, a SAP is used as the B-VPLS up link instead of an SDP. No T-LDP signaling is available.
The existing IEEE 802.1ag implemented for regular VPLS SAPs may be used to troubleshoot connectivity at I-VPLS and B-VPLS layers.