Attaching And Detaching A Qos Policy Action - Cisco Nexus 9000 Series Configuration Manual

Attaching and Detaching a QoS Policy Action

Attaching and Detaching a QoS Policy Action

The software does not allow you to enable or disable QoS features with a configuration command. To enable
or disable QoS features, you must attach or detach QoS policies to or from interfaces or VLANs as described
in this section.
The system-defined type queuing policy maps are attached to each interface unless you specifically attach a
different policy map.
The device allows only one queuing policy per interface.
Note
Policies that are defined at multiple interfaces have the following restrictions:
• A QoS policy attached to the physical port takes effect when the port is not a member of a port channel.
• A QoS policy attached to a port channel takes effect even when policies are attached to member ports.
• A QoS policy attached to a VLAN is applied to all ports in that VLAN that do not have other policies
• One ingress QoS policy is supported for each Layer 3 port and Layer 3 port-channel interface.
• One ingress QoS policy is supported for each VLAN.
• When a VLAN or port channel, or both, touches multiple forwarding engines, all policies that enforce
Default queuing policies are active, unless you configure and apply another policy.
Note
The interface where a QoS policy is applied is summarized in the following table. Each row represents the
interface levels. The entry descriptions are as follows:
• Applied—Interface where an attached policy is applied.
• Present—Interface where a policy is attached but not applied.
• Not present—Interface where no policy is attached.
• Present or not—Interface where a policy is either attached or not, but not applied.
Table 13: QoS Policy Interfaces
Port Policy
Applied
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
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specifically applied.
a rate are enforced per forwarding engine.
For example, if you configure a policer on a specific VLAN that limits the rate for the VLAN to 100
Mbps and if you configure one switch port in the VLAN on one module and another switch port in the
VLAN on another module, each forwarding engine can enforce the 100-Mbps rate. In this case, you
could actually have up to 200 Mbps in the VLAN that you configured to limit the rate to 100 Mbps.
Port-Channel Policy
Not present
Using Modular QoS CLI
VLAN Policy
Present or not