Stacking Guidelines - Allied Telesis AT-SB*908 GEN2 Installation Manual

Stacking Guidelines

Here are general stacking guidelines:
 A stack can have two, three, or four switches.
 Stacking requires v5.4.8-0.2 or later of the AlliedWare Plus
management software. Instructions later in this guide explain how
to view the version number of the operating software on the
switches.
 The VCStack feature comes standard with the AlliedWare Plus
operating software. No additional software or license is required.

The default setting for the VCStack feature on the AT-SBx908
GEN2 Switch is disabled. Enabling it requires rebooting the switch.
Instructions later in this guide explain how to enable the feature
and reboot the unit.
 All the switches in a stack must have the same optional features
licenses. If you purchased optional features, you should install
them on the switches before assembling the stack.
The switches of a stack are connected with a physical network link called a
stack trunk. Here are the trunk guidelines:
 Trunk ports can be 10Gbps, 40Gbps, or 100Gbps.
 There are no default trunk ports.
 A stack can have only one trunk, but, as explained here, a trunk
can have more than one network link.

You designate trunk ports with the STACKPORT command in the
AlliedWare Plus operating system.
 Trunk ports can be on any AT-XEM2 Line Card in any card slot in
the chassis. This differs from other stacking products where trunk
ports are usually pre-defined.
 You cannot view or change the parameter settings of trunk ports.
 If you are using fiber optic transceivers for the trunk, the
transceivers must be from Allied Telesis. Transceivers from other
network equipment providers might not operate properly as part of
a trunk link. For a list of supported transceivers, refer to the Allied
Telesis web site.
 A stack of AT-SBx908 GEN2 Switches cannot contain other
stacking products, such as x600 or x610 Series switches.
 Figure 9 on page 42 illustrates the basic trunk configurations for
stacks of two, three, or four switches. The example shows the AT-
XEM2-4QS Line Card, but the topology is the same for all line
cards.
AT-SBx908 GEN2 Installation Guide for Virtual Chassis Stacking
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