The rule types include the following.

Minimum bandwidth (minimum_bandwidth)

Provides minimum bandwidth constraints on certain types of traffic. If implemented, best efforts are made to provide no less than the specified bandwidth to each port on which the rule is applied.

Bandwidth limit (bandwidth_limit)

Provides bandwidth limitations on networks, ports, floating IPs (FIPs), and router gateway IPs. If implemented, any traffic that exceeds the specified rate is dropped.

DSCP marking (dscp_marking)

Marks network traffic with a differentiated services code point (DSCP) value.

Minimum packet rate (minimum-packet-rate)

Provides minimum rate of packet transmission constraints on certain types of traffic. If implemented, best efforts are made to provide no less than the specified rate of packet transmission to each port on which the rule is applied. Currently, only placement enforcement is supported.

QoS policies can be enforced in various contexts, including virtual machine instance placements, floating IP assignments, and gateway IP assignments.

Depending on the enforcement context and on the mechanism driver you use, a QoS rule affects egress traffic (upload from instance), ingress traffic (download to instance), or both.

[1] RHOSO does not support QoS for trunk ports.

[2] In ML2/OVN deployments, minimum bandwidth rules are enforced in the physical device. You cannot configure this enforcement on bond interfaces.

[3] The mechanism drivers ignore the max-burst-kbits parameter because they do not support it.

[4] ML2/OVN does not support DSCP marking on tunneled protocols.

[1] See OSPRH-507.