Concept Guide

• Policy-Based QoS Congurations
• Enabling QoS Rate Adjustment
• Enabling Strict-Priority Queueing
• Queue Classication 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
• Conguring Policy-Based Rate Shaping
• 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
• Enabling Buer Statistics Tracking
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.
Table 76. dot1p-priority Values and Queue Numbers
dot1p Queue Number
0 1
1 0
Quality of Service (QoS) 755