QoS Implementation Methods
The legacy method of configuring QoS was at each interface, on each router,
using the Command Line Interface (CLI). The current recommended method
is to use the Modular QoS CLI (MQC), which allows you to create one
configuration that can then be applied to many interfaces. Common QoS
settings have been automated with AutoQoS. For those who prefer a GUI
interface, there is the Cisco Router and Security Device Manager (SDM).
Legacy CLI
The traditional QoS configuration using legacy CLI involves accessing the
router via Telnet or console port. Traffic classification and policy enforcement
are combined in the configuration at each interface, which is time-consuming
and can lead to errors.
The types of QoS possible are limited, also. For example, you can do simple
priority queuing, custom queuing, and compression. Legacy CLI QoS might
be used to tweak AutoQoS settings.