Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 771

Table 73. Default DSCP to Queue Mapping DSCP/CP bit range (in hexadecimal) DSCP Definition 111xxx 110xxx 101xxx EF (Expedited Forwarding) 100xxx AF4 (Assured Forwarding) 011xxx AF3 010xxx AF2 001xxx AF1 000xxx BE (Best Effort) Traditional IP Precedence Network Control Internetwork Control CRITIC/ECP Internal Queue ID 7 6 5 Flash Override 4 Flash 3 Immediate 2 Priority 1 Best Effort 0 DSCP/CP decimal range 56-63 48-55 40-47 32-39 24-31 16-23 8-15 0-7 • Enable the trust DSCP feature. POLICY-MAP-IN mode trust diffserv Honoring dot1p Values on Ingress Packets In an input QoS policy, you can configure the system to honor dot1p values on ingress packets using the Trust dot1p feature. The following table specifies the queue to which the classified traffic is sent based on the dot1p value. Table 74. Default dot1p to Queue Mapping Packet dot1p on Ingress Packet 0 1 2 3 4 5 6 7 Queue ID 1 0 2 3 4 5 6 7 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. Quality of Service (QoS) 771