3750G stacking

[dangerious]

I have two running 3750G's do I have to shut them down to add a 3rd? or can I add the link cables and turn it on?

[Edison Ortiz]

You can add a 3rd switch into the stack without problems. No need to turn off the active switches.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12235se/scg/swstack.htm

[Amit Singh]

You can add the switch on the run but you need to take care of some hardware/software compatibility mismatch modes.You also have to stack stack protocol version compatibility on the stack.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12235se/scg/swstack.htm#wp1189523

HTH,

-amit singh