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

Chapter 1: Overview

Stacking S1 and S2 SFP+ Slots

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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 to the switch. However, SFP+ slots
27/S1 and 28/S2 on the AT-x930-28GTX and AT-x930-28GPX Switches
and slots 51/S1 and 52/S2 on the AT-x930-52GTX and AT-x930-52GPX
Switches have an additional function. You may use them 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
The stacking SFP+ slots on the switches are initially configured for
use with the VCStack feature. If you intend to use the switch as a
stand-alone unit, you must disable the VCStack feature before using
the slots with standard SFP or SFP+ transceivers. The configuration
instructions are provided in the x930 Series Installation Guide for
Stand-alone Switches.