Alcatel-Lucent 7750 SR - PBB Mapping to Existing VPLS Configurations; Figure 102: PBB Mapping to VPLS Constructs

PBB Features
Page 772 7750 SR OS Services Guide
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 Figure 102.
Figure 102: PBB Mapping to VPLS Constructs
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 Figure 102). Similar to B-VPLS,
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.
OSSG193
B-ETH
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Facing
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MPLS
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