Interface Configuration
7210 SAS M, T, X, R6, R12, Mxp, S, Sx Interface Configuration Guide Page 97
• 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.
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