Quality of Service Guide QoS and QoS Policies 
Edition: 01 3HE 11014 AAAC TQZZA 159
 
QoS policies can be applied to the following network entities:
• network ingress interface
• network egress interface 
Default QoS policies treat all traffic with equal priority and allow an equal chance of 
transmission (Best Effort forwarding class) and an equal chance of being dropped 
during periods of congestion. QoS prioritizes traffic according to the forwarding class 
and uses congestion management to control access ingress, access egress, and 
network traffic with queuing according to priority.