Dell MX9116n EMC SmartFabric OS10 User Guide - Page 1112

5. Exit WRED CONFIGURATION mode. OS10(config-wred)#exit 6. Create a QoS class-map. OS10(config)# class-map type queuing example-cmap-wred-1 OS10(config-cmap-queuing)# match queue 2 7. Enter QOS POLICY-MAP mode and create a queuing policy type. OS10(config)#policy-map type queuing example-pmap-wred-1 OS10(config-pmap-queuing)# class example-cmap-wred-1 8. Assign a WRED profile to the specified queue. OS10(config-pmap-c-que)#random-detect example-wred-prof-1 9. Exit CLASS MAP and POLICY MAP modes. OS10(config-pmap-c-que)#exit OS10(config-pmap-queuing)#exit 10. Enter SYSTEM QOS mode. OS10(config)#configure system-qos 11. Enable ECN globally. OS10(config-sys-qos)#random-detect ecn After you enable ECN globally, ECN marks the CE bit of the ECN field in a packet as ECT. In the S4200-ON Series platform, configure separate thresholds for ECN capable traffic (ECT). If you enable ECN, ECT is marked based on the configured ECN threshold and non-ECT drops based on the WRED thresholds. Storm control Traffic storms created by packet flooding or other reasons may degrade the performance of the network. The storm control feature allows you to control unknown unicast, multicast, and broadcast traffic on L2 and L3 physical interfaces. OS10 devices monitor the current level of the traffic rate at fixed intervals, compares the traffic rate with the configured levels, and drops excess traffic. By default, storm control is disabled on all interfaces. Enable storm control using the storm-control { broadcast | multicast | unknown-unicast } rate-in-pps command in INTERFACE mode. NOTE: This feature is not supported on the Z9332F-ON platform. • Enable broadcast storm control with a rate of 1000 packets per second (pps) on Ethernet 1/1/1. OS10(conf-if-eth1/1/1)# storm-control broadcast 1000 RoCE for faster access and lossless connectivity Remote Direct Memory Access (RDMA) enables memory transfers between two computers in a network without involving the CPU of either computer. RDMA networks provide high bandwidth and low latency without appreciable CPU overhead for improved application performance, storage and data center utilization, and simplified network management. RDMA was traditionally supported only in an InfiniBand environment. Currently, RDMA over Converged Ethernet (RoCE) is also implemented in data centers that use Ethernet or a mixedprotocol environment. OS10 devices support RoCE v1 and RoCE v2 protocols. • RoCE v1 - An Ethernet layer protocol that allows for communication between two hosts that are in the same Ethernet broadcast domain. • RoCE v2 - An Internet layer protocol that allows RoCE v2 packets to be routed, called Routable RoCE (RRoCE). 1112 Quality of service