Figure 116: Access Multi-Homing - Link Failure - Alcatel-Lucent 7750 SR Manual

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CFM Message - New Opcode

Sorce: CC1 Dest: CFM-Mcast

Bridge Table on C

ISID 100 CMAC 2 A1

ISID 100 CMAC 1 P12

On failure of the active link P11 on BEB C the following processing steps apply:

7750 SR OS Services Guide

Bridge Table on BCB E

Figure 116: Access Multi-Homing - Link Failure

MC-LAG protocol activates the standby link P12 on the pair BEB D.

BMAC C1 becomes active on BEB D and any traffic received on BEB C with destination

BMAC C1 is forwarded on the corresponding I-VPLS SAPs on P12.

BEB D determines the related B-VPLS instance(s) associated with all the I-VPLS 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) an Ethernet CFM-like

message using C1 as source BMAC. A vendor CFM opcode is used followed by an

Alcatel-Lucent OUI.

As a result, all the FIB entries in BCBs or BEBs along the path will be automatically

updated to reflect the move of BMAC C1 to BEB D.

Note that in this particular configuration the entries on BEB A do not need to be updated

saving MAC Flush operation.

Virtual Private LAN Services

Bridge Table on A

ISID 100 CMAC 2 P9

ISID 100 CMAC 1 C1