Alcatel-Lucent 7750 - Figure 27: MC-LAG L2 Dual Homing to Remote PE Pairs

Interface Configuration
7750 SR Interface Configuration Guide Page 141
→ The LAG group-ids do not have to match between neighbor systems. At the same
time, there can be multiple LAG groups between the same pair of neighbors.
→ Verification that the physical characteristics, such as speed and auto-negotiation is
configured and initiates operator notifications (traps) if errors exist. Consistency of
MC-LAG configuration (system-id, administrative-key and system-priority) is
provided. Similarly, load-balancing mode of operation must be consistently
configured on both nodes.
→ Traffic over the signalling link is encrypted using a user configurable message digest
key.
• MC-LAG function provides active/stand-by status to other software applications in order
to built a reliable solutions.
Figure 27: MC-LAG L2 Dual Homing to Remote PE Pairs
Figure 27 depicts different combinations of MC-LAG attachments supported. The supported
configurations can be sub-divided into following sub-groups:
• Dual-homing to remote PE pairs
→ both end-points attached with MC-LAG
→ one end-point attached
• Dual-homing to local PE pair
→ both end-points attached with MC-LAG
→ one end-point attached with MC-LAG
→ both end-points attached with MC-LAG to two overlapping pairs
MSANA
PE-A
PE-B
IP/MPLS
Network
MC-
LAG
MSAN
PE-D
PE-C
MC-
LAG
MSANB
PE-A
PE-B
IP/MPLS
Network
MC-
LAG
MSAN
PE-C
Fig_6