QoS policies

A QoS policy is a configuration mechanism that

governs rate limiting on managed devices
can target multiple devices with each device having one deployed QoS policy at a time, and
contains up to 63 QoS rules that handle network traffic in specified order.

QoS policy characteristics

QoS policies have these key characteristics:

The system matches traffic to QoS rules in the order specified. The system rate limits traffic according to the first rule where all rule conditions match the traffic. Traffic not matching any of the rules is not rate limited.
QoS rules can be limited by source or destination (routed) interfaces. The system enforces rate limiting independently on each of those interfaces and does not support an aggregate rate limit for a set of interfaces.
You can independently rate limit download and upload traffic based on the connection initiator.

Note	A device can have no more than 255 rules, including QoS rules. Exceeding this number causes a deployment warning necessitating a reduction in the number of rules..

Note	QoS operates independently and is not subordinate to a main access control configuration. However, the access control and QoS policies deployed to the same device share identity configurations. For more infomration, see Associating other policies with access control.