Concept Guide
• Pre-Calculating Available QoS CAM Space
• SNMP Support for Buer 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, Denition of the Dierentiated Services Field (DS Field) in the IPv4 and IPv6 Headers
• RFC 2475, An Architecture for Dierentiated Services
• RFC 2597, Assured Forwarding PHB Group
• RFC 2598, An Expedited Forwarding PHB
You cannot congure port-based and policy-based QoS on the same interface.
Port-Based QoS Congurations
You can congure 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 Trac
• Honoring dot1p Priorities on Ingress Trac
• Conguring Port-Based Rate Policing
• Conguring Port-Based Rate Shaping
Setting dot1p Priorities for Incoming Trac
The system assigns trac 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 congured with the same value. You cannot assign a dot1p value
to an individual interface in a port-channel.
Table 81. 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 trac on the interface.
dot1p-priority
Example of Conguring a dot1p Priority on an Interface
Dell#config
844
Quality of Service (QoS)