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This chapter describes the Cisco NX-OS quality of service (QoS) commands that begin with H.
To disable slow port pruning on multicast packets, use the hardware multicast disable-slow-port-pruning command. To enable show port pruning, use the no form of this command.
hardware multicast disable-slow-port-pruning
no hardware multicast disable-slow-port-pruning
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Note This command is applicable to only Cisco Nexus 5548 switches.
This example shows how to disable slow port pruning for multicast packets on a switch:
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To configure the QoS TCAM limit, use the hardware profile tcam feature interface-qos limit command.
hardware profile tcam feature interface-qos limit tcam-size
Interface QoS TCAM limit. The TCAM size can be from 7- 446 entries. |
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No interface policy entry should be present after the interface_qos limit in the QoS region of any TCAM.
This example shows how to set the interface QoS TCAM limit to 20 entries:
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To enable QoS policy offloading on a Fabric Extender (FEX), use the hardware qos-policy-offload command in fabric extender configuration mode. To disable QoS policy offloading, use the no form of this command.
hardware card-type qos-policy-offload
no hardware card-type qos-policy-offload
Fabric extender configuration mode (config-fex)#
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If the existing system-level QoS policy is accepted by the FEX, the QoS policy is enforced by the FEX.
If the existing system-level QoS policy is not accepted by the FEX, an error message is displayed and the fabric ports associated with the FEX are error-disabled, which prevents the FEX from being online.
When you disable the feature, the existing system-level QoS policy is removed from the FEX and the enforcement of the existing QoS policy is changed from ACL-based to Class-of-Service (CoS) based. The TCAM entries are removed and packet classification on the FEX is done using the cos2q map in the FEX hardware.
The maximum number of access control entries (ACEs) in a policy applied on the FEX is 30 when offloaded. In Cisco NX-OS Release 7.3(x), the FEX offload capability using interface QoS policies is up to 100 ACEs and up to only 30 ACEs using system QoS policies.
This example shows how to enable QoS policy offloading on a Cisco Nexus 2248T Fabric Extender:
This example shows how to disable QoS policy offloading on a Cisco Nexus 2248T Fabric Extender:
To enable the virtual output queuing (VOQ) limit for unicast traffic on a switch, use the hardware unicast voq-limit command. To disable the VOQ limit, use the no form of this command.
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Note This command is applicable to only Cisco Nexus 5548 switches.
To alleviate congestion and blocking, you can use virtual output queuing (VOQ) to prevent one blocked receiver from affecting traffic that is being sent to other noncongested receivers (head-of-line blocking).
This example shows how to enable the VOQ limits for unicast packets on a switch:
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