Configuring Wred On Egress Queues - Cisco Nexus 9000 Series Configuration Manual

Configuring Queuing and Scheduling
Command or Action
Example:
switch(config-pmap-c-que)# hardware
qos q-noise percent 20
Step 6 (Optional) Repeat Steps 3 and 4 to assign
tail drop thresholds for other queue classes.
Step 7 show policy-map [type queuing
[policy-map-name | default-out-policy]]
Example:
switch(config-pmap-c-que)# show
policy-map type queuing shape_queues
Step 8 copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config

Configuring WRED on Egress Queues

You can configure WRED on egress queues to set minimum and maximum packet drop thresholds. The
frequency of dropped packets increases as the queue size exceeds the minimum threshold. When the maximum
threshold is exceeded, all packets for the queue are dropped.
WRED and tail drop cannot be configured in the same class.
Note
Note AFD and WRED cannot be applied at the same time. Only one can be used in a system.
SUMMARY STEPS
1. configure terminal
2. policy-map type queuing {[match-first] policy-map-name}
3. class type queuing class-name
4. random-detect [minimum-threshold min-threshold {packets | bytes | kbytes | mbytes}
maximum-threshold max-threshold {packets | bytes | kbytes | mbytes} drop-probability value weight
value] [threshold {burst-optimized | mesh-optimized}] [ecn|non-ecn]
5. (Optional) Repeat Steps 3 and 4 to configure WRED for other queuing classes.
6. (Optional) congestion-control random-detect forward-nonecn
Purpose
This command is supported for Cisco Nexus 9300-EX Series switches
beginning with Cisco NX-OS Release 7.0(3)I4(4).
(Optional) Displays information about all configured policy maps, all policy
maps of type queuing, a selected policy map of type queuing, or the default
output queuing policy.
(Optional) Saves the running configuration to the startup configuration.
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
Configuring Congestion Avoidance
105