Dell SmartFabric OS10 User Guide Release 10.5.3

Queuing

The egress bandwidth of a port is logically divided into eight queues (0 to 7).

Data that is classified at ingress into the different traffic classes is assigned to the respective queue by default. You can override the default mapping. Depending on the priority that is configured for the traffic, you can assign the traffic flow to different queues at egress. Queues with higher priority are serviced first before moving on to queues with lower priority.

By default, the value of traffic class ID for all the traffic is 0.

You can set the traffic class ID for a flow by enabling trust or by classifying ingress traffic and marking it with a traffic class ID using a policy map (qos-map). The order of precedence for a qos-map is:

1. Interface-level map
2. System-qos-level map
3. Default map

User–defined QoS map

You can override the default mapping by creating a QoS map.

Configure user–defined QoS map

1. Create a QoS map.

   OS10(config)# qos-map traffic-class tc-q-map

2. Define the set of traffic class values mapped to a queue.

   OS10(config-qos-map)# queue 3 qos-group 0-3

   NOTE: For the Z9332F-ON platform, you must specify the type of queue. For example:

   OS10(config-qos-map)# queue 3 qos-group 0-3 type ucast

3. Verify the map entries.

   OS10# show qos maps type tc-queue
   
   Traffic-Class to Queue Map: tc-q-map
   
   Queue        Traffic-Class
   
   --------------------------
   
   3              0-3
   

4. Apply the map on a specific interface or on a system-QoS global level.
   • Interface level

     OS10(conf-if-eth1/1/1)# qos-map traffic-class tc-q-map
     

   • System-qos level

     OS10(config-sys-qos)# qos-map traffic-class tc-q-map

Choose all traffic classified for a queue

1. Create a queuing type class-map to match queue 5.

   OS10(config)# class-map type queuing q5

2. Define the queue to match.

   OS10(config-cmap-queuing)# match queue 5