Dell PowerSwitch S5212F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 1316

Ingress traffic classification Ingress traffic can either be data or control traffic. OS10 groups network traffic into different traffic classes, from class 0 to 7 based on various parameters. Grouping traffic into different classes helps to identify and prioritize traffic as it goes through the switch. NOTE: Traffic class is also called as QoS group. By default, OS10 does not classify data traffic. OS10 assigns the default traffic class ID 0 to all data traffic. OS10 implicitly classifies all control traffic such as STP, OSPF, ICMP, and so on, and forwards the traffic to control plane applications. See Control-plane policing for more information. Data traffic classification You can classify the data traffic based on ACL or trust. ACL-based classification consumes significant amount of network processor resources. Trust-based classification classifies traffic in a pre-defined way without using network processor resources. Trust based classification OS10 supports classification based on the 802.1p CoS field (L2) or DSCP field (L3). 802.1p CoS trust map: Trust the 802.1p CoS field to mark with a traffic-class ID and color for the CoS flow. Weighted random early detection (WRED) uses color to define drop-probabilities and thresholds for egress traffic. See Color traffic for more information. By default, 802.1p priority level 0 is assigned traffic class (TC) ID 1 and 802.1p priority level 1 is assigned TC 0. The rest of the 802.1p priority levels (2 through 7) are assigned the respective TC IDs. Table 81. Default 802.1p CoS trust map CoS Traffic class ID Color 0 1 G 1 0 G 2 2 G 3 3 G 4 4 G 5 5 G 6 6 G 7 7 G NOTE: You cannot modify the default CoS trust map. User-defined 802.1p CoS trust map You can override the default mapping by creating a dot1p trust map. All the unspecified dot1p entries map to the default traffic class ID 0. Configure user-defined 802.1p CoS trust map 1. Create a dot1p trust map. OS10(config)# trust dot1p-map example-dot1p-trustmap-name OS10(config-tmap-dot1p-map)# 1316 Quality of service