3Com 3C16987A, 3C16988A Stacking Units, Treated as a single manageable unit with one IP address

Stacking Units 29

Stacking Units	Units in the Switch 1100/3300 family can be stacked together and then
	treated as a single manageable unit with one IP address.
	The Matrix Port on the rear of the Switch SM, TM and XM allows you to
	connect two Switch units back-to-back. For this you need a Matrix Cable
	(part number 3C16965). Contact your supplier for details.
	The three Matrix Ports on the rear of the Switch MM allow you to
	connect a total of four units in the Switch 1100/3300 family together
	using Matrix Cables.
	The Switches in a stack are numbered 1 to 4, from the bottom up, for
	management purposes. The SuperStack 3 Switch 3300 MM will always
	be identified as Unit 1 and should therefore be positioned at the bottom
	of the stack.
	Only one SuperStack 3 Switch 3300 MM unit can be fitted per stack.

Stacking Two Units You can stack two Switch units with a single Matrix Cable. To do this:

1Power-off both units.

2Arrange the units as required. If you are using a Switch 3300 MM it must be positioned at the bottom of the Stack. They can be rack-mounted or free-standing; if you choose to have them free-standing, remember to position the rubber feet as detailed in “Placing Units On Top of Each Other” on page 28. When positioning the units, note that Matrix Cables are 1m (3.28ft) long.

3Connect one end of the Matrix Cable to the Matrix Port of the top Switch, and the other end to the Matrix Port of the lower Switch (See Figure 12).

4If you use the management software of the units:

■Ensure that both units have the same version of management software

■Ensure that you re-configure the stack-wide features on both units

For more information about management software, see “Managing the

Switch” on page 34.