Alcatel-Lucent 7750 SR OS, Interface Configuration Manual, Page: 78 / 444

Port Features
Page 78 7750 SR OS Interface Configuration Guide
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In case there is a tie in the selection algorithm, for example, two sub-groups with
identical aggregate weight (or number of active links) the group which is local to the
system with lower system LACP priority and LAG system ID is taken.
• Providing inter-chassis communication channel allows inter-chassis communication to
support LACP on both system. This communication channel enables the following:
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Supports connections at the IP level which do not require a direct link between two
nodes. The IP address configured at the neighbor system is one of the addresses of the
system (interface or loop-back IP address).
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The communication protocol provides heartbeat mechanism to enhance robustness of
the MC-LAG operation and detecting node failures.
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Support for operator actions on any node that force an operational change.
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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.
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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.
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Traffic over the signalling link should be 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 17: MC-LAG Dual Homing to Remote PE Pairs
MSAN
A
PE-A
PE-B
IR MPLS
Network
MG-
LAG
MSAN
PE-D
PE-C
MG-
LAG
MSAN
B
PE-A
PE-B
IR MPLS
Network
MG-
LAG
MSAN PE-C
Fig_6