Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 983

5 Exit WRED CONFIGURATION mode. OS10(config-wred)#exit 6 Enter QOS POLICY-MAP mode and create a queuing policy type. OS10(config)#policy-map type queuing pol-map-1 7 Create a QoS class for the queuing policy type. OS10(config-pmap-queuing)#class default 8 Assign a WRED profile to the specified queue. OS10(config-pmap-c-que)#random-detect prof1 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. In the storm control unknown unicast configuration, both the unknown unicast and unknown multicast traffic are rate-limited. 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: On the S5148F-ON platform, there is a 2% of deviation in storm control configuration. • 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 mixed-protocol 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). Quality of service 983