Users Guide

• Using A Congurable Weight for WRED and ECN
• Pre-Calculating Available QoS CAM Space
• SNMP Support for Buer 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, Denition of the Dierentiated Services Field (DS Field) in the IPv4 and IPv6 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
The system assigns 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 80. dot1p-priority Ingress Values and Queue Numbers
Packet Dot1p on Ingress Packet Queue Number on C9000 Series
0 1
1 0
2 2
3 3
4 4
5 5
6 6
7 7
• Change the priority of incoming trac on the interface.
dot1p-priority
Example of Conguring a dot1p Priority on an Interface
Dell#config
Quality of Service (QoS)
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