Dell PowerEdge M420 Configuration Manual page 496

For many features, you can configure a range of interfaces. When you enter
Interface Configuration mode for multiple interfaces, the commands you
execute apply to all interfaces specified in the range.
To enter Interface Configuration mode for a range of interfaces, include the
keyword range and specify the interfaces to configure. For example, to apply
the same configuration to ports 1-10 on a standalone switch, use the
following command:
console(config)#interface range gigabitEthernet
1/0/1-10
To enter Interface Configuration mode for ports 3, 4, 5, 12, and 14 on a
standalone switch, use the following command:
console(config)#interface range gigabitEthernet
1/0/3-5,1/0/12,1/0/14
496
Configuring Port Characteristics