nd for a stacked switch reflects the position the switch occupies in the stack. The module# on a 3750 is always 0. The port# is the physical port number on the switch. Thus, port 14 on the third switch in a stack would be numbered Gi3/0/14. For the most part, any feature can be used on a single switch or a stack. For example, EtherChannels and SPAN sessions can be configured between switches within a stack. Interface Ranges Interface ranges are a very useful addition to IOS. Instead of entering the same com- mands on multiple interfaces, you can specify a range of interfaces, and then enter the commands once. When you apply commands to an interface range, the parser will replicate the commands on each interface within the range. On a switch with 96 interfaces, this can save hours of time-especially during initial configurations. Interface ranges are composed of lists of interfaces. Interfaces can be specified individually or grouped in concurrent ranges. Individual interfaces are separated by commas, while ranges are shown as the starting and ending interfaces separated by hyphens. Here, I'm accessing the two interfaces g1/0/10 and g1/0/12: 3750(config)# interface range g1/0/10 , g1/0/12 3750(config-if-range)# Once in config-if-range configuration mode, all commands you enter will be applied to every interface you've included in the specified range. Here, I'm accessing the range of ports g1/0/10 through (and including) g1/0/12. When specifying a range, the second value only needs to include the significant value from the interface. That is, I don't need to type g/1/0/10 - g1/0/12, but only g1/0/10 - 12: 3750(config)# interface range g1/0/10 - 12 750(config-if-range)# Chapter 18: Catalyst 3750 Features To reference multiple ranges, separate them with commas. Here, I'm referencing the ranges g1/0/10 through g1/0/12 and g1/0/18 through g1/0/20: 3750(config)# interface range g1/0/10 - 12 , g1/0/18 - 20 3750(config-if-range)# Not only can you specify lists of interfaces, but you can save lists of interfaces for future