DGS-3312SR Stackable Gigabit Layer 3 Switch
7
Switch Stacking
The DGS-3312SR can be stacked with a DES-3226S or DES-3250TG, functioning as the Master of the stack. There are
three connection options available to for stacking.
1. Utilizing a gigabit Ethernet port with either the built-in combination mini-GBIC ports or using the DEM-340T
1000BASE-T stacking module.
2. Using a fiber-optic transceiver cabling with either the built-in combination mini-GBIC ports or using the DEM-
340MG SFP (Mini GBIC) stacking module.
3. Using IEEE 1394 fire wire cabling with the DEM-540 IEEE 1394 Stacking Module.
Each optional stacking module allows up to four DES-3226S or DES-3250TG Switches to be interconnected in a stack
with the DGS-3312SR for up to twelve gigabit ports that may be used to stack up to 12 slave units to provide up to 576
10/100 Mbps ports and 12 Gigabit ports in a star architecture. For stacking, the DGS-3312SR will be the master switch of a
stack of DES-3226S switches, DES-3250TG switches or a combination of both. The entire Switch stack is managed and
monitored through the network or alternatively, through the serial port on the DGS-3312SR.
The IEEE 1394 fire wire stacking ports are marked
IN
and
OUT
. The IEEE 1394 compliant cable must be connected from
an
IN
port on one Switch to an
OUT
port on the next Switch in the stack.
Restrictions and Cautions for Stacking
The DGS-3312SR may serve as the Master of up to twelve additional Switches. The slave switch units must meet the
following criteria:
•
All additional slave Switches must be DES-3226S or DES-3250TG Switches. The slave unit types can be mixed
within a single stacked group.
•
DES-3226S or DES-3250TG slave Switches must have firmware Release IV or later loaded to operate properly
with the DGS-3312SR Master.
•
The DGS-3312SR is automatically started as the Master Switch in a Switch stack.
•
It is necessary to enable stacking for each slave Switch in a stacked group before interconnecting them and before
connecting the group to the network. Stacking can be enabled by connecting to each slave through the console
port and using the CLI stacking configuration command. Before stacking has been enabled on the slaves, the
IEEE 1394 port is treated logically as an individual 1000BASE port in full-duplex mode. Since the Spanning Tree
Protocol is disabled by default, a broadcast storm will result if the stacking link is completed between Switches
that have not been properly configured.
NOTICE:
The CLI stacking command set for the DGS-3312SR is slightly different
from the CLI stacking command set for the DES-3226S
or
DES-3250TG. Please
refer to the CLI Reference Manual for each Switch for details or read the
instructions starting with the next section.
