Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 718

Table 77. Default dot1p to Queue Mapping dot1p 0 1 2 3 4 5 6 7 Queue ID 0 0 0 1 2 3 3 3 The dot1p value is also honored for frames on the default VLAN. For more information, refer to Priority-Tagged Frames on the Default VLAN. • Enable the trust dot1p feature. POLICY-MAP-IN mode trust dot1p Mapping dot1p Values to Service Queues All traffic is by default mapped to the same queue, Queue 0. If you honor dot1p on ingress, you can create service classes based the queueing strategy in Honoring dot1p Values on Ingress Packets. You may apply this queuing strategy globally by entering the following command from CONFIGURATION mode. • All dot1p traffic is mapped to Queue 0 unless you enable service-class dynamic dot1p on an interface or globally. • Layer 2 or Layer 3 service policies supersede dot1p service classes. • Create service classes. INTERFACE mode service-class dynamic dot1p Guaranteeing Bandwidth to dot1p-Based Service Queues To guarantee bandwidth to dot1p-based service queues, use the following command. Apply this command in the same way as the bandwidth-percentage command in an output QoS policy (refer to Allocating Bandwidth to Queue). The bandwidth-percentage command in QOS-POLICY-OUT mode supersedes the service-class bandwidthpercentage command. • Guarantee a minimum bandwidth to queues globally. CONFIGURATION mode service-class bandwidth-percentage Applying an Input Policy Map to an Interface To apply an input policy map to an interface, use the following command. You can apply the same policy map to multiple interfaces, and you can modify a policy map after you apply it. • You cannot apply a class-map and QoS policies to the same interface. 718 Quality of Service (QoS)