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hardware profile latency monitor base
hardware profile tcam feature interface-qos limit
H Commands
This chapter describes the Cisco NX-OS quality of service (QoS) commands that begin with H.
hardware pq-drain
To configure the proxy-queue drain rate settings, use the hardware pq-drain command in global confiiguration mode. To disable proxy-queue drain settings, use the no form of this command.
hardware pq-drain 10g 10g-drain-rate 40g 40g-drain-rate
no hardware pq-drain 10g 10g-drain-rate 40g 40g-drain-rate
Syntax Description
Command Default
Disabled
Command Modes
Global configuration mode
Command History
Usage Guidelines
Note
This command is applicable to only Cisco Nexus 6000 switches.
When the proxy queue reaches a threshold that indicates congestion, Explicit Congestion Notification (ECN) marking is performed so that the receiver of the packet echoes the congestion indication to the sender. The proxy-queue drain rate is configured to ensure that during congestion at egress ports only a certain amount of packets are drained.
Examples
This example shows how to configure proxy-queue settings to drain 9900 Mbps of traffic from 10 Gigabait interfaces and 39900 Mpbs of traffic from 40 Gigabit interfaces:
switch(config)# hardware pq-drain 10g 9900 40g 39900Related Commands
hardware profile latency monitor base
To specify the histogram base-value time to construct switch latency monitoring histograms, use the hardware profile latency monitor base command in global configuration mode. To remove switch latency monitoring base values, use the no form of this command.
hardware profile latency monitor base base-value
no hardware profile latency monitor base
Syntax Description
base-value
Histogram base value used to construct switch latency monitoring histograms. Valid values are multiples of 8 in the range 8 to 2147483640 nanoseconds.
Command Default
Disabled
Command Modes
Global configuration mode
Command History
Usage Guidelines
Note
If you enter a base value that is not a multiple of 8, the system automatically modifies the base value to the nearest (lower) number that is a multiple of 8.
Note
Examples
This example shows how to configure a histogram base value of 800 nanoseconds:
switch(config)# hardware profile latency monitor base 800Related Commands
hardware profile tcam feature interface-qos limit
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
Syntax Description
Command Default
None
Command Modes
Global configuration mode
Command History
Usage Guidelines
No interface policy entry should be present after the interface_qos limit in the QoS region of any TCAM.
Examples
This example shows how to set the interface QoS TCAM limit to 20 entries:
switch(config)# configue terminalswitch(config)# hardware profile tcam feature interface-qos limit 20switch(config)# show hardware profile tcam feature qosFeature Limit--------------------------------------------------------------------------------Interface 20vlan-qos + global-qos 428switch(config)# copy running-config startup-configRelated Commands
hardware random-detect
To configure Explicit Congestion Notification (ECN) for a Quality of Service (QoS) group, use the hardware random-detect command in global configuration mode. To disable ECN, use the no form of this command.
hardware random-detect min-thresh 10g 10g-min-theshold 40g 40g-min-threshold max-thresh 10g 10g-max-threshold 40g 40g-max-threshold ecn qos-group group-number
no hardware randon-detect 10g 10g-min-theshold 40g 40g-min-threshold max-thresh 10g 10g-max-threshold 40g 40g-max-threshold ecn qos-group group-number
Syntax Description
Command Default
Disabled
Command Modes
Global configuration mode
Command History
Usage Guidelines
Note
To implement Weighted Random Early Detection (WRED) Explicit Congestion Notification (ECN) on proxy queues you use the hardware random-detect command to configure minimum and maximum threshold values per QoS group. Then you use the hardware pq-drain command to configure the proxy-queue drain rate.
Examples
This example shows how to enable ECN threshold values for the class-default QoS group:
switch(config)# hardware random-detect min-thresh 10g 64000 40g 4000 max-thresh 10g 12800040g 246000 ecn qos-group 0Related Commands
hardware unicast voq-limit
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.
hardware unicast voq-limit
no hardware unicast voq-limit
Syntax Description
This command has no arguments or keywords.
Command Default
Disabled
Command Modes
Global configuration mode
Command History
Usage Guidelines
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).
Examples
This example shows how to enable the VOQ limits for unicast packets on a switch:
switch(config)# hardware unicast voq-limitswitch(config)#Related Commands
hardware multicast disable-slow-port-pruning
Disables slow port pruning on the switch.
show running-config
Displays the running configuration on a switch.
