Stacking Guidelines - Allied Telesis AT-x550-18XTQ Installation Manual

Stacking Guidelines

Here are the stacking guidelines:
 A stack can have up to two x550 Series switches.
 No additional software or licenses are required for stacking.
 The switches of a stack can be the same or different x550 models.
 Any x550 Series switch model can be the master switch of a stack.
 A stack of x550 Series switches may not contain other stacking
switches, such as x600 or x610 Series switches.

Stacking is enabled by default on the switches.

The two switches of a stack are connected together with a stack
trunk consisting of four 40Gbps QSFP+ transceivers. You install
the transceivers in slots 17 and 21 in the switches.

You must use Allied Telesis 40Gbps QSFP+ transceivers for the
stack trunk. The switches will not form a stack with QSFP+
transceivers from other network equipment providers. For a list of
supported transceivers, refer to the product's data sheet on the
Allied Telesis web site.
 You may use Allied Telesis AT-QSFPCU Cables series direct
connect cables for the stack trunk if the switches are in the same
equipment rack or wiring room.
 You may not install a networking device, such as a media
converter or Ethernet switch, between two stacking transceivers.
x550 Series Installation Guide for Virtual Chassis Stacking
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