Allied Telesis SwitchBladex8112 Installation Manual page 331

Section III: Building a Stack with VCStack Plus
SwitchBlade x8112 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
 Use the SHOW LICENSE BRIEF command in the Privileged Exec
mode to confirm that you installed the VCStack Plus licenses and
enabled the feature on the switches. If a switch does not have the
license, perform "Activating the VCStack Plus Feature License" on
page 309 to install it. If the command shows that the license is
activated but the feature is not enabled, perform "Enabling the
Stacking Feature" on page 311.

Use the SHOW LICENSE BRIEF command to confirm that they
have the same feature licenses. If they have different licenses, add
or delete licenses so that they have the same feature licenses.
 Use the SHOW STACK command to compare the ID numbers of
the switches. One switch should have the ID 1 and the other ID 2.
To configure the ID numbers, perform "Setting the ID Number" on
page 315.
You might also try watching for error messages on the Console port on
one of the controller cards when you power on or reset the switches. Here
are the messages:
 The following error message indicates that the two chassis have
different feature licenses. Switches cannot form a stack if they
have different licenses. Perform "Displaying the Feature Licenses"
on page 313 on both switches to determine which switch needs a
license. For example, if, after performing the procedure, you
determine that one of the switches has the premium license and
the other one does not, obtain and install the premium license on
the other unit.
chassis[nnnn] Software feature licensing incompatible. Card
n.n will boot as a standalone system

Switches running AlliedWare Plus 5.4.5 or later display the
following message if one or more of the SFP+ transceivers in the
stack trunk are not from Allied Telesis. Replace the transceivers
with transceivers from Allied Telesis.
Only ATI qualified SFP+ modules are support in this port.
Please remove.
 Switches running AlliedWare Plus 5.4.4 or earlier display the
following message if one or more of the SFP+ transceivers in the
stack trunk are not AT-StackOP/0.3 or AT-StackOP/9.0
transceivers. Remove the standard transceivers and replace with
stacking transceivers.
EXFX[nnn]: ERROR: stack port n.n.n - Only AT-StackOP support
in this port. Please remove
 The following error message indicates that the two switches cannot
form the stack because they have different versions of the
AlliedWare Plus management software. To resolve the problem,
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