1ah,IEEE 802.1d,
MEF 6, MEF 10.1
Geographic reach/applications Provided for MAC encapsulation
(MAC-in-MAC) to enable substantial
Layer 2 scalability
IEEE 802.1ah, IEEE 802.1QAy
Bandwidth granularity Defi ned how the bandwidth profi le
parameters can be set from 1M to 10G
in granular increments
MEF 11
19 The Ethernet frame size is now correspondingly augmented; the devices in the network should be able to
support this.
84 Chapter 2
aims to provide the connection-oriented features of TDM to the hitherto connectionless
Ethernet. The IEEE has undertaken this effort??”also referred to as the Provider
Backbone Bridge with Traffic Engineering (PBB-TE)??”since it is essentially a variation
of the IEEE 802.1ah PBB standard. In fact, PBT also employs a MAC-in-MAC forwarding
scheme from PBB and also distributes the bridging tables using the control plane.
PBT, however, does not use some of the features defined in PBB such as broadcasting
and MAC learning and does not support the Spanning Tree Protocol.
PBT basically provisions Point-to-Point Ethernet paths that are engineered across
Service Provider Ethernet networks. These paths provide traffic engineering (and are
referred to as PBB-TE) and allow for setting up QoS to meet predefined SLAs across
the service provider WAN.
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