Figure 119: Solution For Access Dual-Homing With Local Switching For Pbb Eline/Epipe - Alcatel-Lucent 7750 SR Manual

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Dual-Homing into PBB Epipe - local switching use case
When the service SAPs were mapped to MC-LAGs belonging to the same pair of BEBs in earlier
releases, an IVPLS had to be configured even if there were just two SAPs active at any point in
time. Since then, the PBB EPIPE model has been enhanced to support configuring in the same
EPIPE instance two SAPs and a BVPLS uplink as depicted in the diagram below.

Figure 119: Solution for Access Dual-Homing with local switching for PBB ELINE/EPIPE

The PBB Epipe represented by the yellow diamond on BEB1 points through the BVPLS uplink to
the BMAC associated with BEB2. The destination BMAC can be either the address associated
with the green BVPLS on BEB2 or the BMAC of the SAP associated with the pair MC-LAG on
BEB2 (preferred option).
7750 SR OS Services Guide
BMAC C1 becomes active on BEB D and any traffic received on BEB C with destination
BMAC C1 is forwarded on the corresponding EPIPE SAPs on P12.
BEB D determines the related B-VPLS instance(s) associated with all the EPIPE SAP(s)
mapped to P12, the newly activated MC-LAG link(s)/LAG component(s).
Subsequently, BEB D floods in the related B-VPLS instance(s) the same Ethernet CFM
message using C1 as source BMAC.
As a result, the FIB entries in BEB A and BEB B will be automatically updated to reflect
the move of BMAC C1 from EP1 to EP2 and from EP3 to EP4, respectively.
Note that the same process is executed for all the MC-LAGs affected by BEB C failure so
BEB failure will be the worst case scenario.
Virtual Private LAN Services
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