Cisco command 'history'

Starting from IOS 15.1 cisco command history is appeared. It outputs a pretty nice ASCII diagram of interfaces loading.

For enable:

(config)# interface GigabitEthernet 0/1
(config-if)# history bps

Now you can see the result using the command:

# show interface GigabitEthernet 0/1 history 60sec input

The different periods (60sec, 60min, 72hour) and different traffic directions (input, output, both) are available.