Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R2 - Page 443
Queue selection
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• dot1p -Sets the dynamic classification to trust dot1p. • fallback-(Optional) Honor trusting 802.1p (dot1p) only if other match criteria in this policy-map fails to qualify for a packet. Honor 802.1p priorities on ingress traffic OS10(config)# policy-map policy-trust OS10(conf-pmap-qos)# class class-trust OS10(conf-pmap-c-qos)# trust dot1p View policy-map OS10(conf-pmap-c-qos)# do show policy-map Service-policy(qos) input: policy-trust Class-map (qos): class-trust trust dot1p Queue selection OS10 does not honor DSCP values on ingress traffic by default. Honoring DSCP means assigning a traffic-class ID implicitly based on the incoming packets. You can use the trust command under the reserved class-map name class-trust to enable honoring DSCP. The following limitations apply to S5148F-ON: • Global clearing of queue statistics are applied to 576 UC , 576 MC and 12CPU Queues. Dell EMC recommends to use type specific clear statistics. • Bandwidth weight is equally applied to UC and MC. • The mapping of traffic class to queue must be applied on egress port. Table 3. Default DSCP to Queue Mapping DSCP/CP hex range (XXX)xxx DSCP definition / traditional IP precedence 111XXX 110XXX 101XXX 100XXX 011XXX 010XXX 001XXX 000XXX -/ network control -/internetwork control EF, expedited forwarding / CRITIC/ECP AF4, assured forwarding / flash override AF3 / flash AF2 / immediate AF1 / priority BE, best effort / best effort Internal queue ID / DSCP/CP decimal - 8-queue 7 / 56-63 6 / 48-55 5 / 40-47 4 / 32-39 3 / 24-31 2 / 16-23 1 / 8-15 0 / 0-7 1 Create a policy-map, and configure a name for the policy-map in CONFIGURATION mode. policy-map [type qos] policy-map-name 2 Associate the class-trust class-map with the policy-map in POLICY-MAP-CLASS-MAP mode. class-map class-trust 3 Honor incoming IP packets to classify this packet to a traffic-class ID in POLICY-MAP mode. trust {diffserv} [fallback] • diffserv -Sets the dynamic traffic-class to trust DSCP. If a policy-map has trust (dot1p or diffserv) enabled and has ACLbased classification, only trust-based classification is used. • fallback-(Optional) Honor trusting DSCP only if other match criteria in this policy-map does not apply to a packet. If a policymap has trust (dot1p or fallback) enabled and has ACL-based classification, the packet is assigned a priority using trust-based classification -trust is the fallback mechanism for ACL classification conflicts. Quality of service 443
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