Most of the time you would use SNMP for that. Using SNMP you can periodically request the interface counters and the difference between the value now and that of 5 minutes ago is the activity of the port over the last 5 minutes.
Most network monitoring systems can do this for you, however I do not know if they can sort the output for you. This depends on the tool you use.
To get a quick overview you could take a look at 'show interface counters' which includes input and output counters for each interface. By resetting these to zero with 'clear counters' and checking that output after some time you would get an indication of which interface is passing the most traffic.
Catalyst 6500 has a feature called 'TopN Reports' which automates and sorts this output for you.
If you're interesting in monitoring interface trends over a longer period of time rather than just at one moment,
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...