Prerequisites For Network Qos; Guidelines And Limitations; Dynamic Packet Prioritization - Cisco Nexus 9000 Series Configuration Manual

Prerequisites for Network QoS

Product
Cisco NX-OS
Prerequisites for Network QoS
The network QoS policy has the following prerequisites:
• You must be familiar with using modular QoS CLI.
• You are logged on to the device.

Guidelines and Limitations

The network QoS policy has the following configuration guidelines and limitations:
• show commands with the internal keyword are not supported.
• Changing the network QoS policy is a disruptive operation, and it can cause traffic drops on any or all
• When enabling jumbo MTU, the default network QoS policy can support jumbo frames. Under the

Dynamic Packet Prioritization

Dynamic Packet Prioritization (DPP) prioritizes a configured number of packets of every new flow in a
particular class of traffic is prioritized and sent through a configured class of traffic that DPP is mapped to.
When the number of packets in a flow reaches a specific threshold, prioritization ends and the subsequent
packets in the flow go to the normal class.
Default number of packets is120.
Note
• Maximum number of packets:
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
126
ports.
network QoS policy, the MTU is used only for buffer carving when no-drop classes are configured. No
additional MTU adjustments are required under the network QoS policy to support jumbo MTU.
◦Application Spine Engine (ASE2) enabled switches — 256
◦Leaf Spine Engine (LSE) enabled switches — 1024
License Requirement
The QoS feature does not a require license. Any
feature not included in a license package is bundled
with the NX-OS image and is provided at no extra
charge to you. For a complete explanation of the
Cisco NX-OS licensing scheme, see the
Licensing Guide.
Configuring Network QoS
Cisco NX-OS