Pbb Mapping To Existing Vpls Configurations; Figure 102: Pbb Mapping To Vpls Constructs - Alcatel-Lucent 7750 SR Manual

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PBB Features

PBB Mapping to Existing VPLS Configurations

The IEEE model for PBB is organized around a B-component handling the provider backbone

layer and an I-component concerned with the mapping of the customer/provider bridge (QinQ)

domain (MACs, VLANs) to the provider backbone (B-MACs, B-VLANs): for example, the I-

component contains the boundary between the customer and backbone MAC domains.

Alcatel-Lucent's implementation is extending the IEEE model for PBB to allow support for MPLS

pseudowires using a chain of two VPLS context linked together as depicted in

A VPLS context is used to provide the backbone switching component. The white circle marked

B, referred to as backbone-VPLS (B-VPLS), operates on backbone MAC addresses providing a

core multipoint infrastructure that may be used for one or multiple customer VPNs. Alcatel-

Lucent's B-VPLS implementation allows the use of both native PBB and MPLS infrastructures.

Another VPLS context (I-VPLS) can be used to provide the multipoint I-component functionality

emulating the ELAN service (refer to the triangle marked "I" in

I-VPLS inherits from the regular VPLS the pseudowire (SDP bindings) and native Ethernet

(SAPs) handoffs accommodating this way different types of access: for example, direct customer

link, QinQ or HVPLS.

7750 SR OS Services Guide

102). Similar to B-VPLS,