1. 1 PBB MEPs and MIPs [Intended only for discussion purposes - DWM] MIP MEP MHF 1 35 1 35 B CompI Comp Customer MD Levels SP MD Service Level IB Link Access Link UNI Per S-VLAN Per I-SID Backbone Edge Bridge SP MD Facility Level Backplane Per B-VID 1:1 S-Tagged Service Interface PBP CBPPIP CIP Provider Bridge Customer CFM PDUs treated as data in PBBN 0 7 SP MD Link Level 0 7 0 7

2. 2 PBB / CFM Frame Formats.1ad Type B-TCI B-DA B-SA B-TAG B-FCS.1ag Type MDL/Ver Rest of OAMPDU SFD PA IPG C-DA C-SA.1ah Type I-SID+ Rest of OAMPDU.1ad Type B-TCI B-DA B-SA B-TAGI-TAG B-FCS.1ag Type MDL/Ver I-TCI SFD PA IPG Ethernet encapsulated format (any interface) OAM frame (Facility MD Level) One per B-VID; B-Comp CBP to B-Comp CBP Ethernet encapsulated format (any interface) OAM frame (Service MD Level) One per I-SID; I-Comp PIP to I-Comp PIP * Depicted at the 802.3 MAC server layer interface (i.e. the RS sublayer)

3. 3 PBB MEPs and MIPs – CFM c22 View [Intended only for discussion purposes - DWM] 1:1 S-Tagged Service Interface B CompI Comp Backbone Edge Bridge 8.6.3 8.6.1,.2,.4 EISS 8.6.1,.2,.4 ISS EISS ISS 8.6.3 ISS 8.6.1,.2,.4 EISS 8.6.1,.2,.4 EISS media Provider Bridge ISS 8.6.3 8.6.1,.2,.4 EISS media MIP MHF MEP