Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.0ER - Page 638
Con ETS, Optional
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• An ETS-enabled interface operates with dynamic weighted round robin (DWRR) or strict priority scheduling. • OS10 control traffic is sent to control queues, which have a strict priority that is higher than data traffic queues. ETS-allocated bandwidth is not supported on a strict priority queue. A strict priority queue receives bandwidth only from DCBX TLVs. • The CEE/IEEE2.5 versions of ETS TLVs are supported. ETS configurations are received in a TLV from a peer. Configure ETS ETS provides traffic prioritization for lossless storage, latency-sensitive, and best-effort data traffic on the same link. • Configure classes of dot1p and DSCP traffic and assign them to lossless queues. Use the class-trust class map to honor ingress dot1p and DSCP traffic. • Allocate guaranteed bandwidth to each lossless queue. An ETS queue can exceed the amount of allocated bandwidth if another queue does not use its share. ETS is disabled by default on all interfaces. 1 Configure trust maps of dot1p and DSCP values in CONFIGURATION mode. A trust map does not modify ingress values in output flows. Assign a qos-group (traffic class 0-7) to trusted dot1p/DSCP values in TRUST mode. A qos-group number is used only internally to schedule classes of ingress traffic. Enter multiple dot1p and dscp values in a hyphenated range or separated by commas. trust dot1p-map dot1p-map-name qos-group {0-7} dot1p {0-7} exit trust dscp-map dscp-map-name qos-group {0-7} dscp {0-63} exit 2 Configure a QoS map with trusted traffic-class (qos-group) to lossless-queue mapping in CONFIGURATION mode. Assign one or more qos-groups (0-7) to a specified queue in QOS-MAP mode. Enter multiple qos-group values in a hyphenated range or separated by commas. Enter multiple queue qos-group entries, if necessary. qos-map traffic-class queue-map-name queue {0-7} qos-group {0-7} exit 3 Create a service policy for the class-trust class in CONFIGURATION mode. Enter POLICY-CLASS-MAP mode and specify that dot1p or DSCP values are trusted. policy-map trust-policy-map-name class class-trust trust {dot1p | dscp} exit 4 Create a queuing class map for each ETS queue in CONFIGURATION mode. Enter match queue criteria in CLASS-MAP mode. class-map type queuing class-map-name match queue {0-7} exit 5 Create a queuing policy map in CONFIGURATION mode. Enter POLICY-CLASS-MAP mode and configure the percentage of bandwidth allocated to each traffic class-queue mapping. The sum of all DWRR-allocated bandwidth across ETS queues must be 100% (not including the strict priority queue). Otherwise, QoS automatically adjusts bandwidth percentages so that ETS queues always receive 100% bandwidth. The remaining non-ETS queues receive 1% bandwidth each. policy-map type queuing policy-map-name class class-map-name bandwidth percent {1-100} (Optional) To configure a queue as strict priority, use the priority command. Packets scheduled to a strict priority queue are transmitted before packets in non-priority queues. policy-map type queuing policy-map-name class class-map-name priority 6 Apply the trust maps for dot1p and DSCP values, and the traffic class-queue mapping globally on the switch in SYSTEM-QOS mode or on an interface or interface range in INTERFACE mode. system qos trust-map dot1p dot1p-map-name 638 Converged data center services
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