PBB-TE has addressed end-to-end protection of P2P TESI within a single domain.
Service providers need efficient mechanism to protect vulnerable links of the topology
N:1 is not addressed in PBB-TE.
Definitions of Segment
A Segment is a single link, or a sequence of links and bridges, providing connectivity between two bridges. The segment is bounded at each end by a Provider Network Port (PNP). A bridge lying within the segment is a BCB. A segment endpoint bridge is a BCB or an IB-BEB.
A Primary segment is a segment along whose path one or more TESIs have been coincidently provisioned
A Backup segment is a segment having the same endpoint bridges as the primary segment but whose path is otherwise disjoint from the primary segment.
An Infrastructure Segment is Sequence of links and bridges that protects atleast one TESI coincident with it
Multiple Data Path segments can be associated with an infrastructure segment
Infrastructure Protection - Preserve connectivity of all TESIs transiting an active infrastructure segment on the failure of one or more links or bridges associated with that segment.
Data Path Protection - Preserve connectivity of a TESI in the presence of a TESI data path failure occurring within the active TESI segment due to link failure, node failure, FDB corruption, etc.
M:1 Protection – Support multiple backup segments (M≥1) to which traffic can be switched in the event of the failure of the primary segment. The backup segment having the highest provisioned priority value among operational backup segments is selected to be the active segment. Should support Load Balancing. M = 3 atleast.
IEEE standard for Local and Metropolitan Area Networks --- Virtual Bridged Local Area Networks --- Amendment ?? --- Transport Segment Protection Switching
Scope: What project is
The scope of this project is to define feature extension of 802.1Q (2005) supporting protection of critical portion of the provisioned or traffic engineered services by offering at-least the same guarantee as offered originally by the traffic engineered services with minimal impact on existing standards
Scope: What Project is not
The project will only provide features necessary to support external management plane command or control plane.
The selection of protection segment and bandwidth management either through management commands or by control plane is outside the scope of this project