• Implementation Information• Port-Based QoS Configurations• Policy-Based QoS Configurations• Enabling QoS Rate Adjustment• Enabling Strict-Priority Queueing• Queue Classification Requirements for PFC Functionality• Support for marking dot1p value in L3 Input Qos Policy• Weighted Random Early Detection• Pre-Calculating Available QoS CAM Space• Specifying Policy-Based Rate Shaping in Packets Per Second• Configuring Policy-Based Rate Shaping• Configuring Weights and ECN for WRED• Configuring WRED and ECN Attributes• Guidelines for Configuring ECN for Classifying and Color-Marking Packets• Applying Layer 2 Match Criteria on a Layer 3 Interface• Enabling Buffer Statistics TrackingImplementation InformationThe Dell Networking QoS implementation complies with IEEE 802.1p User Priority Bits for QoS Indication.It also implements these Internet Engineering Task Force (IETF) documents:• RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 Headers• RFC 2475, An Architecture for Differentiated Services• RFC 2597, Assured Forwarding PHB Group• RFC 2598, An Expedited Forwarding PHBYou cannot configure port-based and policy-based QoS on the same interface.Port-Based QoS ConfigurationsYou can configure the following QoS features on an interface.NOTE: You cannot simultaneously use egress rate shaping and ingress rate policing on the same virtual local area network(VLAN).• Setting dot1p Priorities for Incoming Traffic• Honoring dot1p Priorities on Ingress Traffic• Configuring Port-Based Rate Policing• Configuring Port-Based Rate ShapingSetting dot1p Priorities for Incoming TrafficDell Networking OS places traffic marked with a priority in a queue based on the following table.If you set a dot1p priority for a port-channel, all port-channel members are configured with the same value. You cannot assign a dot1p valueto an individual interface in a port-channel.Quality of Service (QoS) 697
