Allied Telesis AT-DC2552XS, Installation Manual, Page: 37 / 96

AT-DC2552XS / L3 Enterprise Core Switch Installation Guide
37
Note
You can only create VCStacks using switches from within the same
product group, for example, all AT-DC2552XS / L3 switches, or all
x610 Series switches.
Stacking connectivity and functionality varies slightly between switch
types. Your AT-DC2552XS / L3 switch can support a maximum of two
devices per stack. Consult the appropriate software reference for stacking
functionality of other Allied Telesis switches.
The Physical
Stack
A VCStack can consist of a maximum of two individual AT-DC2552XS / L3
switches, interconnected via high-speed stacking links (QSFP+ ports 49,
53, 57, or 61). A stack always has a primary stack member called the
stack master (displayed in the show commands as the active master). The
remaining switch then becomes an ordinary member of the stack, and is
referred to as the backup member.
VCStack Cables and Connections
Stack members are interconnected via the QSFP+ ports 49, 53, 57, or 61.
These ports are shown in Figure 11.
Figure 11. Stacking Ports
The stacking cables must connect ports that have the same port number.
A stack will form regardless of which port numbers are used for linking, as
long as the same numbers are linked together. This means that you can
connect your stack using any two of the following pairs of ports:

port 49 connected to port 49

port 53 connected to port 53

port 57 connected to port 57

port 61 connected to port 61