Alcatel-Lucent 7210 SAS M Interface Configuration Manual page 76

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7210 SAS M, T, X, R6, R12, Mxp Interface Configuration Guide
Selection of the common system ID, system-priority and administrative-key are used in
LACP messages so partner systems consider all links as the part of the same LAG.
Extension of selection algorithm in order to allow selection of active sub-group.
→ The sub-group definition in LAG context is still local to the single box, meaning that
even if sub-groups configured on two different systems have the same sub-group-id
they are still considered as two separate subgroups within given LAG.
→ Multiple sub-groups per PE in a MC-LAG is supported.
→ 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:
→ 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).
→ The communication protocol provides heartbeat mechanism to enhance robustness of
the MC-LAG operation and detecting node failures.
→ Support for operator actions on any node that force an operational change.
→ 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.
Interface Configuration
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