Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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Egress traffic classification

Egress traffic is classified into different queues based on the traffic-class ID marked on the traffic flow.

Set the traffic class ID for a flow by enabling trust or by classifying ingress traffic and mark it with a traffic class ID using a policy map. By default, the value of traffic class ID for all the traffic is 0.

The order of precedence for a qos-map is:

Interface-level map
System-qos-level map
Default map

Table 1. Default mapping of traffic class ID to queueDefault mapping of traffic class ID to queue
Traffic class ID	Queue ID
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7

User–defined QoS map

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

Configure user–defined QoS map

Create a QoS map.

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

Define the set of traffic class values mapped to a queue.
```
 OS10(config-qos-map)# queue 3 qos-group 0-3
```

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

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

Create a queuing type class-map to match queue 5.
```
OS10(config)# class-map type queuing q5
```

Define the queue to match.

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