Stack Trunks; Ports 1 To 24 And Ports 1 To 48 - Allied Telesis x950 Series Installation Manual

Chapter 3: Virtual Chassis Stacking

Stack Trunks

Ports 1 to 24 and
Ports 1 to 48
74
The switches of a stack are connected with a physical network link called
the stack trunk. Here are general trunk guidelines:
The ports of a trunk can be 10Gbps, 40Gbps, or 100Gbps.

A stack can have only one trunk.

A trunk can have multiple physical links between switches, for

added bandwidth and resiliency.
All the ports in the trunk must be the same speed.

There are no default trunk ports.

You designate trunk ports with the STACKPORT command in the

AlliedWare Plus operating system.
Once ports are designated as trunk ports, you cannot view or

change their parameter settings.
The fiber optic transceivers or direct attach cables of a trunk must

be from Allied Telesis. Transceivers or cables from other network
equipment providers might not perform properly as trunks. For a
list of supported transceivers, refer to the Allied Telesis web site.
A stack of x950 Switches cannot include other stacking products,

such as x600 Switches.
In most cases, a trunk should have a minimum of two physical links

between switches.
If a trunk fails for any reason, the switches operate as stand-alone

devices.
You can choose the ports of a trunk from the following groups on the x950
Switches:
"Ports 1 to 24 and Ports 1 to 48," next

"Ports 25 to 37 and Ports 49 to 61 with 40Gbps Transceivers" on

page 79
"Ports 25 to 37 and Ports 49 to 61 with 100Gbps Transceivers" on

page 80
"XEM2 Line Cards" on page 82

Ports 1 to 24 on the x950-28XSQ switch and ports 1 to 48 on the
x950-52XSQ switch support 1/2.5/5/10Gbps SFP/SFP+ transceivers,
while ports 1 to 24 on the x950-28XTQm switch are twisted pair ports that
support 1/2.5/5/10Gbps. Even though the ports are different on these
switches, the rules to using them as a stack trunk are mainly the same.
Here are the guidelines: