Dell S4048T-ON, Configuration Manual

Page: 732 / 1146

• Implementation Information
• Port-Based QoS Configurations
• Policy-Based QoS Configurations
• DSCP Color Maps
• Enabling QoS Rate Adjustment
• Enabling Strict-Priority Queueing
• Weighted Random Early Detection
• Pre-Calculating Available QoS CAM Space
• 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
• Applying DSCP and VLAN Match Criteria on a Service Queue
• Classifying Incoming Packets Using ECN and Color-Marking
• Guidelines for Configuring ECN for Classifying and Color-Marking Packets
• Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class
• Sample configuration to mark non-ecn packets as “yellow” with single traffic class
• Enabling Buffer Statistics Tracking
Implementation Information
The 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 PHB
You cannot configure port-based and policy-based QoS on the same interface.
Port-Based QoS Configurations
You 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 Shaping
Setting dot1p Priorities for Incoming Traffic
Dell 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 value
to an individual interface in a port-channel.
732 Quality of Service (QoS)