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Chapter 2: Virtual Chassis Stacking
Stack Trunks
SFP+ Ports S1
and S2
46
The switches of a stack are connected by a physical network link called
the stack trunk. Consisting of two ports on each switch, stack trunks have
these guidelines:
You can use either the two Multi-Gigabit copper ports or the two
SFP+ ports as the stack trunk. On the GS970EMX/20 Switch, the
Multi-Gigabit copper ports are 17 and 18, and the SFP+ ports are
19/S1 and 20/S2. On the GS970EMX/28 Switch, the Multi-Gigabit
copper ports are 25 and 26, and the SFP+ ports are 27/S1 and 28/
S2. On the GS970EMX/52 Switch, the Multi-Gigabit copper ports
are 49 and 50, and the SFP+ ports are 51/S1 and 52/S2.
The default stack trunk ports are the SFP+ ports.
A stack can have only one trunk.
To use the Multi-Gigabit copper ports as the stack trunk, you first
have to remove the SFP+ ports from the trunk and then add the
Multi-Gigabit copper ports. This is explained in Chapter 10,
"Building Stacks with Multi-Gigabit Copper Ports" on page 127.
The trunk cannot contain both SFP+ ports and Multi-Gigabit
copper ports.
The trunk ports must be at their default settings.
Allied Telesis recommends on stacks of three or more switches
connecting the top and bottom switches together to form a loop in
the trunk topology. This is illustrated in the following examples.
You cannot view or change the parameter settings of trunk ports.
Here are additional guidelines for the SFP+ ports S1 and S2 as the stack
trunk:
The SFP+ ports support 1Gbps and 10Gbps transceivers when
used as regular Ethernet ports. For best performance, Allied
Telesis recommends 10Gbps transceivers for the stack trunk.
If the switches are physically adjacent to each other, such as in the
same or adjacent equipment racks, you can use 1-meter
SP10TW1 or 3-meter SP10TW3 10Gbps direct connect twinax
cables for the trunk cables.
Note
The GS970EMX Switches do not support the 7-meter SP10TW7
cable.
The fiber optic transceivers or direct attach cables for the trunk
must be from Allied Telesis. For a list of supported transceivers,
refer to the product's data sheet on the Allied Telesis web site.
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