Stacking S1 And S2 Sfp+ Slots - Allied Telesis AT-x930-28GTX Installation Manual

Stacking S1 and S2 SFP+ Slots

As explained in the previous section, you may use the four SFP+ slots on
the front panel of the switch with SFP 1000Mbps or SFP+ 10Gbps
transceivers to add high speed links from the switch to other network
devices. However, SFP+ slots 27/S1 and 28/S2 on the 28-port switches
and slots 51/S1 and 52/S2 on the 52-port switches have an additional
function. They can also be used with SFP+ transceivers and the VCStack
feature to build a stack of up to eight switches. The switches of a VCStack
act as a single virtual unit. They synchronize their actions so that switching
operations, like spanning tree protocols, virtual LANs, and static port
trunks, span across all of the units and ports. The two main advantages of
stacks are listed here:
 You can manage multiple units simultaneously, which can simplify
network management.

You have more flexibility in how you configure some of the
features. For instance, a static port trunk on a stand-alone switch
has to consist of ports from the same switch. In contrast, a static
trunk on a stack may consist of ports from different switches in the
same stack.
Note
SFP+ slots 27/S1 and 28/S2 on the 28-port switches and slots 51/S1
and 52/S2 on the 48-port switches are initially configured as stacking
slots for the VCStack feature. If you intend to use the switch as a
stand-alone unit, you must disable the VCStack feature before you
can use the slots with standard SFP or SFP+ transceivers. The
configuration instructions are provided later in this guide, in Chapter
10, "Configuring the Switch for Stand-alone Operation" on page 125.
Note
This guide explains how to install the devices as stand-alone units.
For instructions on how to install the switches in a VCStack with the
S1 and S2 slots, refer to the x930 Series Installation Guide for
Virtual Chassis Stacking.
x930 Series Installation Guide for Stand-alone Switches
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