Configuring Queuing And Scheduling - Cisco Nexus 9000 Series Configuration Manual

Configuring Queuing and Scheduling

Ingress Queuing
The following are notes about ingress queuing:
• No default system ingress queuing policy exists.
• The ingress queuing policy is used to override the specified pause buffer configuration.
• When downgrading to an earlier release of Cisco Nexus 9000 NX-OS, all ingress queuing configurations
• The ingress queuing feature is supported only on platforms where priority flow control is supported.
• Ingress queuing is not supported on devices with 100G ports.
• The ingress queuing policy is supported only at the system level (and not at the interface level) for Cisco
• Beginning with Cisco NX-OS Release 7.0(3)F1(1), the X9636C-R and X9636Q-R line cards and the

Configuring Queuing and Scheduling

Queuing and scheduling are configured by creating policy maps of type queuing that you apply to an egress
interface. You can modify system-defined class maps, which are used in policy maps to define the classes of
traffic to which you want to apply policies.
For information about configuring policy maps and class maps, see the
You can configure the congestion-avoidance features, which include tail drop and WRED, in any queue.
You can configure one of the egress congestion management features, such as priority, traffic shaping, and
bandwidth in output queues.
WRED is not supported on ALE enabled device front panel 40G uplink ports. When WRED is configured
Note
for the system level, the setting is ignored and no error message is displayed. When WRED is configured
for the port level, the setting is rejected and an error message is displayed.
The system-defined policy map, default-out-policy, is attached to all ports to which you do not apply a queuing
policy map. The default policy maps cannot be configured.
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
100
◦ System ingress queuing policy (if applied and queue-limit configuration specified for that class).
◦ The hardware qos ing-pg-share configuration provided value.
◦ System default value.
have to be removed.
Nexus 9508 switches with the X9732C-EX line card and Cisco Nexus 93108TC-EX and 93180YC-EX
switches.
C9508-FM-R fabric module (in a Cisco Nexus 9508 switch) support ingress queuing.
Configuring Queuing and Scheduling
Using Modular QoS CLI section.