Pbb Mapping To Existing Vpls Configurations; Figure 61: Pbb Mapping To Vpls Constructs - Alcatel-Lucent 7210 SAS M Service Manual

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
7210 does not support MPLS pseudowires in a PBB B-component and PBB I-component.
1
8
Octets
Bits
Note: I-PW and B-PW are not supported on 7210 SAS devices.
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 native PBB infrastructures.
Note: 7210 implementation allows the use of only native PBB over Ethernet 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
VPLS inherits from the regular VPLS and native Ethernet (SAPs) handoffs accommodating this
way different types of access: for example, direct customer link, QinQ or HVPLS.
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I-PCP Res2
6 5 4 3 2 1
1 2-4 5-10
I-SID

Figure 61: PBB Mapping to VPLS Constructs

11-16
C-DA C-SA
2-4
2+2
6+6
22B
(No FCS/Preamble)
Figure
Payload
Ethertype
C-VID
Ethertype
S-VID
Ethertype
C-SA
C-DA
I-TAG
802.1ad
Ethertype
B-VID
Ethertype
B-SA
B-DA
OSSG192
Figure 61). Similar to B-VPLS, I-
7210 SAS M Services Guide
61.