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Network Warrior, 2nd Edition by Gary A. Donahue

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Interface Ranges

Interface ranges are a very useful addition to IOS. Instead of entering the same commands on multiple interfaces, you can specify a range of interfaces and then enter the commands only 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. You can specify interfaces 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 you’re 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, for the second value I only need 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
3750(config-if-range)#

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)# ...

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