Administrator Guide

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Quality of Service (QoS)
Quality of service (QoS) is supported on the MXL switch platform.
Dierentiated service is accomplished by classifying and queuing trac, and assigning priorities to those queues.
The MXL switch trac has four data queues per port. All queues are serviced using the Weighted Round Robin scheduling algorithm.
You can only manage prioritize queuing on egress.
NOTE: When you enable DCB, the egress QoS features in the output QoS policy-map (such as service-class bandwidth-
percentage and bandwidth-percentage), the default bandwidth allocation ratio for egress queues and strict-priority may
not work as intended.This is to provide compatibility with DCBX. Hence, it is recommended to have the DCB disabled
when you wish to apply these features exclusively.
Table 48. Dell Networking OS Support for Port-Based, Policy-Based, and Multicast QoS Features
Feature Direction
Port-Based QoS Congurations Ingress + Egress
Set dot1p Priorities for Incoming Trac Ingress
Honor dot1p Priorities on Ingress Trac Ingress
Congure Port-based Rate Policing Ingress
Congure Port-based Rate Shaping Egress
Policy-Based QoS Congurations Ingress + Egress
Classify Trac Ingress
Create a Layer 3 Class Map Ingress
Set DSCP Values for Egress Packets Based on Flow Ingress
Create a Layer 2 Class Map Ingress
Create a QoS Policy Ingress + Egress
Create an Input QoS Policy Ingress
Congure Policy-Based Rate Policing Ingress
Set a DSCP Value for Egress Packets Ingress
Set a dot1p Value for Egress Packets Ingress
Create an Output QoS Policy Egress
Congure Policy-Based Rate Shaping Egress
Allocate Bandwidth to the Queue Egress
Congure a Scheduler to Queue Egress
Specify WRED Drop Precedence Egress
Create Policy Maps Ingress + Egress
Create Input Policy Maps Ingress
Honor DSCP Values on Ingress Packets Ingress
Honoring dot1p Values on Ingress Packets Ingress
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Quality of Service (QoS)