Switch Services 5-45
• In a redundancy group of three switches (S1, S2 and S3), if S1 has X licenses, S2 has Y licenses and S3
has Z licenses, the license count is X+Y+Z (the aggregation of each switch).
• A cluster license is re-calculated whenever a new switch brings existing licenses to a group or an existing
switch’s license value changes (increases or decreases).
• A simple switch reboot will not initiate a new cluster license calculation, provided the re-booted switch
does not come up with different installed license.
• A change to an installed license during runtime initiates a cluster license calculation.
• If an existing redundancy group member goes down, it will not initiate a cluster license calculation.
• Whenever the cluster protocol is disabled, a member switch forgets the learned cluster license as well
as peer information needed to compute license totals.
• If the switch start-up configuration is removed, a member switch forgets the learned cluster license as
well as peer information needed to compute license totals.
• If adding a new switch (with zero or non-zero installed license) to a group with at least one license
contributing switch down, the new group member will receive a different cluster license value.
For example, for a cluster of three switches (S1 = 6, S2 = 6 and S3 = 6 licenses), the group license count
is 18. If S1 goes down, the license count is still 18, since the license calculation is not initiated if a
member switch goes down. If S4 (with zero licenses) is introduced, S4 becomes part of the group (can
exchange updates and other packets), but has license count of 12 (NOT 18), even though S2 and S3 still
show a license count of 18. This should be an indicator a new member has been introduced during a
period when the redundancy group is not operating with all its license contributing members.
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