Allied Telesis AT-SBx81CFC960, Installation Manual

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Chapter 14: VCStack Plus Overview
280 Section III: Building a Stack with VCStack Plus
VCStack Plus Feature License
An important component of the stack is the VCStack Plus feature license
from Allied Telesis. The license contains an activation code that activates
the stacking feature in the management software on the controller cards in
the chassis.
Each chassis must have its own VCStack Plus license. The licenses must
be installed while the switches are operating as stand-alone units. A
chassis that has two controller cards needs only one license because the
active master controller card shares the license with the standby master
card in the same chassis at the time you install the license. But the license
is not shared between different switches, which is why the two chassis of
the stack have to have their own licenses.
Here are the VCStack Plus feature license guidelines:
 Each chassis must have a license.
 A chassis that has two controller cards needs only one license.
 The licenses from Allied Telesis may have the same or different
activation codes. The switches will form the stack regardless of
whether they have the same or different activation codes.
 The licenses have to be installed while the units are operating as
stand-alone switches.