OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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Strict priority queuing

OS10 uses queues for egress QoS policy-types. You can enable priorities to dequeue all packets from the assigned queue before servicing any other queues. When more than one queue is assigned strict priority, the highest number queue receives the highest priority. You can configure strict priority to any number of queues. By default, all queues schedule traffic per WDRR.

You can use the priority command to assign the priority to a single unicast queue—this configuration supersedes the bandwidth percent configuration. A queue with priority enabled can starve other queues for the same egress interface.

Create class-map

  1. Create a class-map, and configure a name for the class-map in CONFIGURATION mode.
    class-map type queuing 
                                           class-map-name
                                        
  2. Configure a match criteria in CLASS-MAP mode.
    match queue 
                                           queue-id
                                        

Define a policy-map

  1. Define a policy-map, and create a policy-map name CONFIGURATION mode.
    policy-map type queuing 
                                           policy-map-name
                                        
  2. Create a QoS class and configure a name for the policy-map in POLICY-MAP mode.
    class 
                                           class-map-name
                                        
  3. Set the scheduler as the strict priority in POLICY-MAP-CLASS-MAP mode.
    priority

Apply policy-map

  1. You can now apply the policy-map to the interface (INTERFACE mode) or all interfaces—SYSTEM-QOS mode.
    system qos
    OR
    interface ethernet 
                                           node/slot/port[:subport]
                                        
  2. Enter the output service-policy in SYSTEM-QOS mode or INTERFACE mode.
    service-policy {output} type {queuing} 
                                           policy-map-name
                                        

Enable strict priority on class-map

OS10(config)# class-map type queuing magnum
                                 OS10(conf-cmap-queuing)# match queue 7
                                 OS10(conf-cmap-queuing)# exit
                                 OS10(config)# policy-map type queuing solar
                                 OS10(conf-pmap-queuing)# class magnum
                                 OS10(conf-pmap-c-que)# priority
                                 OS10(conf-pmap-c-que)# exit
                                 OS10(conf-pmap-queuing)# exit
                                 OS10(config)# system qos
                                 OS10(conf-sys-qos)# service-policy output solar
                              

View QoS system

OS10(conf-sys-qos)# do show qos system
                                 Service-policy (output)(queuing): solar
                              

Enable strict priority on interface

OS10(config)# interface ethernet 1/1/5
                                 OS10(conf-if-eth1/1/5)# service-policy output type queuing solar
                              

View policy-map

OS10(conf-if-eth1/1/5)# do show policy-map
                                 Service-policy(queuing) output: solar
                                 Class-map (queuing): magnum
                                 priority
                              

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