Pbb Packet Walkthrough; Figure 62: Pbb Packet Walkthrough - Alcatel-Lucent 7210 SAS M Service Manual

PBB Features

PBB Packet Walkthrough

This section describes the walkthrough for a packet that traverses the B-VPLS and I-VPLS
instances using the example of a unicast frame between two customer stations as depicted in the
following network diagram
CMAC X
The station with CMAC (customer MAC) X wants to send a unicast frame to CMAC Y through
the PBB-VPLS network. A customer frame arriving at PBB-VPLS U-PE1 is encapsulated with the
PBB header. The local I-VPLS FIB on U-PE1 is consulted to determine the destination BMAC of
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Figure
Payload
Ethertype
C-VID
Ethertype
S-VID
Ethertype
C-SA X
C-DA Y
U-PE1
(B1)
N-PEs
PBB-VPLS
U-PEs

Figure 62: PBB Packet Walkthrough

62.
Payload
Ethertype
C-VID
Ethertype
S-VID
Ethertype
C-SA X
C-DA Y
I-TAG
Ethertype
B-SA B1
B-DA B2
VPLS/MPLS
Core
Payload
Ethertype
C-VID
Ethertype
S-VID
Ethertype
C-SA X
C-DA Y
CMAC Y
PBB-VPLS
U-PEs
OSSG194
7210 SAS M Services Guide