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D-Link DES-3250TG Standalone Layer 2 Switch
Figure 4- 2. Switch connected to a port on a hub or switch using a straight or crossover cable
10BASE-T Device
For a 10BASE-T device, the Switch’s LED indicators should display the following:
● Link/Act indicator is ON.
100BASE-TX Device
For a 100BASE-TX device, the Switch’s LED indicators should display the following:
● Link/Act is ON.
Stacking vs. Standalone Operation
By default, the Switch configuration settings allow it to operate as a standalone device, or in a stacked group. It is not
necessary to change any settings for the Switch to function in either capacity. However, it is useful to understand how the
stacking mode operates in the Switch and the effects if any this may have on configuration settings in a Switch when its
stacking status is changed.
Stacking mode is enabled by default and can be changed using the CLI command config stacking mode. If the Switch has
stacking mode enabled and is properly connected to other DES-3250TG Switches, a negotiation takes place upon starting up
the Switches to determine how the Switch functions in the stack. For an all-DES-3250TG stack, any time a change occurs in
the structure or composition of a stacked Switch group the entire stack will restart and the negotiation process begins anew.
When the stacking mode is disabled (config stacking mode disable), the Switch only allows standalone operation. If
stacking mode is disabled on a Switch, it should be disconnected from a stacked group.
NOTE: The firmware for Release 4 allows stacking operation of the DES-3250TG as a slave to the
DGS-3312SR in a star topology. See the example below for more information.
Stacking mode can be changed using the CLI. When a DES-3250TG Switch stack is first assembled, it is advisable to
determine which Switch will function as the master before placing the Switches in a rack and connecting them. If the Switch is
used in a stacked group with the DGS-3312SR, the DGS-3312SR operates as the master and the DES-3250TG Switches in the
stacked group operate as slaves. The possible stacking configuration modes are as follows:
Enabled: Stacking mode is enabled by default. When enabled the Switch can operate as a standalone device or it can operate
with other DES-3250TG Switches in a properly connected stacked group. Stacking must be enabled for the Switch to function
in a stacked arrangement with other DES-3250TG Switches or with a DGS-3312SR Switch.
Auto: This is the default stacking mode setting for the DES-3250TG. In auto stacking mode, the Switch is eligible for stacking
or it can operate as a standalone device. If a DES-3250TG Switch stack is connected and all units are configured to operate in
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