The IEEE 802.1ah efforts to standardize PBB should be consulted for more updated
information on PBB.
Provider Bridge Transport (PBT)/PBB with Traffic Engineering (PBB-TE) While Carrier
Ethernet can be delivered over numerous transport technologies, such as SONET and
MPLS (see Part II for a compendium), one option is to deliver it over native Ethernet
(see Chapter 13 on bridging and switching). However, native Ethernet itself has been
limited as a plausible transport technology especially as Carrier Ethernet services
were enabled on a wide area basis (beyond the access networks and stretching well
into the core and beyond). One key hurdle is the inherent best-effort approach of LAN
Ethernet, which is ill-suited in a service that supports time-sensitive applications.
With the emergence of a new standardization effort, namely the Provider Bridge
Transport (PBT), a more deterministic Ethernet is being attempted. In fact, PBT
TABLE 2.3 Standards Efforts Enabling Scalability
Key Components Major Developments Reference
Millions of users/endpoints Extended the addressable space for
users and architecture and framework
for scaling services defi ned
IEEE 802.
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