Configuring Congestion Avoidance - Cisco Nexus 7000 Series Configuration Manual

Configuring Congestion Avoidance

To disable the DSCP mapping, use the no hardware qos dscp-to-queue ingress command.
Note
When you modify a system-defined class map, the changes occur immediately and might disrupt traffic on
all VDCs that use the modified class map.
The device automatically modifies the DSCP values that you configured in other queues so that each DSCP
value appears only once in the queues of the same type.
Before you begin
Ensure that you are in the default VDC for the device.
Procedure
Step 1
Step 2
Step 3
Step 4
Step 5
Configuring Congestion Avoidance
You can configure congestion avoidance with tail drop or WRED features. Both features can be used in ingress
and egress policy maps.
Note WRED and tail drop cannot be configured in the same class.
Cisco Nexus 7000 Series NX-OS Quality of Service Configuration Guide
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Command or Action
switch# configure terminal
(Optional) switch(config)# hardware qos
dscp-to-queue ingress module type {all |
f-series | m-series}
switch(config)# class-map type queuing
match-any class-queuing-name
switch(config-cmap-que)# match dscp
value-range
switch(config-cmap-que)# exit
Configuring Queuing and Scheduling on M-Series I/O Modules
Purpose
Enters global configuration mode.
Enables the dscp-to-queue mapping on the
specified module(s).
Use the hardware qos dscp-to-queue ingress
module type command if you have not enabled
dscp-to-queue mapping.
Configures the class map of type queuing, and
then enters class-map queuing mode.
Sets the DSCP value range matched by this
queue. You can specify a range of values by
using a hyphen between the beginning and
ending values and a comma/space between
values. The range is from 0 to 63.
Repeat Steps 5 and 6 to modify
Note
DSCP values for additional queues
Exits class-map queue mode, and enters global
configuration mode.