How to add Stack in 3750 Switch

1.  Configure #2 as your stack master using the command "switch 1 priority 15";
2.  Next, pre-configure #1 into #2 using the command "switch 2 provisioning <3750 model number>" and/or "switch 3 provisioning <3750 model number>" and so on.
3.  In #2, configure the ports, VLANs, etc.  Because you have "provisioned" the switch you can start putting config.
4.  Once you are happy with what you are done to #2, ensure that #1 has the same IOS version and feature-set to #2;
5.  Erase the config of #2 stack.
6.  Power down #1 switch
7.  Connect members of #1 to #2 via the stack cable;
8.  Once #2 is populated with the switch members, apply power to the rest of the stack members one at a time and in the order of your stack.  This means that you power up stack member 2, wait for about 10 seconds, power up member 3, etc.
9.  Once the rest of the stack members have joined the stack, you can add "switch 2 priority 13", "switch 3 priority 11", etc.

You do not need to power down the #2 stack master when you add the rest of the stack members.  The stack members, however, need to be powered down before you attach the stacking cable.

If #2 interface identification is "Fast 1/0/XX" then its good.  If #2 interface ID is not what you want, "Fast 3/0/XX instead of Fast 1/0/XX", then you need to run a few extra commands:  switch <current switch number> renumber 1 and reboot.  This means that after the reboot, the #2 interface ID will be "1".

So when you attach the stack members to the stack master and power up the stack members one at a time and in order, stack member switch 2 will have an interface ID of "Fast 2/0/XX", stack member switch 3 will have an interface ID of "Fast 3/0/XX", etc.