The assured forwarding (AF) per-hop behavior provides four different forwarding classes that you can assign to a packet. Every forwarding class provides three drop precedences, as shown in Table 37–2.
The various AF codepoints provide the ability to assign different levels of service to customers and applications. In the QoS policy, you can prioritize traffic and services on your network when you plan the QoS policy. You can then assign different AF levels to the prioritized traffic.