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

Virtual Private LAN Services
7750 SR OS Services Guide Page 801
Figure 116: Access Multi-Homing - Link Failure
On failure of the active link P11 on BEB C the following processing steps apply:
• 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.
OSSG352
BCB-E BCB-F
P13P16
MC-LAG
P12
Active
P11
Active
P11
Standby
P10
Standby
P9
Active
BMAC
A1
P15
P14
Root
CFM Message - New Opcode
Sorce: CC1 Dest: CFM-Mcast
Bridge Table on BCB E
B-MACA1 P13
B-MACC1 P15
Bridge Table on C
ISID 100 CMAC 2 A1 P6
ISID 100 CMAC 1 P12
Bridge Table on A
ISID 100 CMAC 2 P9
ISID 100 CMAC 1 C1 P2
BMAC
D
BMAC
C
C-MAC-1 C-MAC-2
ES1 ES2
BEB
D
BEB
C
P6P8 P2P4
BEB
B
BEB
A
MC-LAG
BMAC
B
BMAC
A
BMAC
C1
BMAC
A1
BMAC
C1