Concept Guide

• Policy-Based QoS Congurations
• DSCP Color Maps
• Enabling QoS Rate Adjustment
• Enabling Strict-Priority Queueing
• Weighted Random Early Detection
• Pre-Calculating Available QoS CAM Space
• Conguring Weights and ECN for WRED
• Conguring WRED and ECN Attributes
• Guidelines for Conguring 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 Conguring ECN for Classifying and Color-Marking Packets
• Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class
• Sample conguration to mark non-ecn packets as “yellow” with single trac class
Implementation Information
The Dell EMC 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, Denition of the Dierentiated Services Field (DS Field) in the IPv4 Headers
• RFC 2475, An Architecture for Dierentiated Services
• RFC 2597, Assured Forwarding PHB Group
• RFC 2598, An Expedited Forwarding PHB
You cannot congure port-based and policy-based QoS on the same interface.
Port-Based QoS Congurations
You can congure 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 Trac
• Honoring dot1p Priorities on Ingress Trac
• Conguring Port-Based Rate Policing
• Conguring Port-Based Rate Shaping
Setting dot1p Priorities for Incoming Trac
Dell EMC Networking OS places trac 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 congured with the same value. You cannot assign a dot1p value
to an individual interface in a port-channel.
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Quality of Service (QoS)