Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 681

OS10 device monitors the current level of traffic rate at fixed intervals, compares the traffic rate with configured levels, and drops excess traffic. By default, storm control is disabled on all interfaces. You can enable storm control using the storm-control { broadcast | multicast | unknown-unicast } rate-in-pps command in the INTERFACE mode. NOTE: In S5148F-ON, there is a 2% of deviation in the storm control configuration. Configure storm control • The following example enables 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) is a technology that 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 any appreciable CPU overhead, which is required 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 and hence called Routable RoCE (RRoCE). To enable RRoCE, configure the QoS service policy on the switch, and in the ingress and egress directions on all the interfaces. See Configure RoCE on the switch for more information about this configuration. Configure RoCE on the switch The following example describes the steps that you need to perform to configure RoCE on the switch. This configuration example uses priority 3 for RoCE. 1 Enter in to the CONFIGURATION mode. OS10# configure terminal OS10 (config)# 2 Enable the Data Center Bridging Exchange protocol (DCBX). OS10 (config)# dcbx enable 3 Create a VLAN. In this example, we use VLAN 55 to switch the RoCE traffic. You can configure any value from 1 to 4093. OS10 (config)# interface vlan 55 4 Create a network-qos type class-map for priority flow control (PFC). OS10 (config)# class-map type network-qos pfcdot1p3 OS10 (config)# match qos-group 3 5 Create queuing-type class-maps for enhanced transmission selection (ETS). OS10 (config)# class-map type queuing Q0 OS10 (config)# match queue 0 OS10 (config)# class-map type queuing Q3 OS10 (config)# match queue 3 6 Create a QoS map for ETS. OS10 (config)# qos-map traffic-class 2Q OS10 (config)# queue 0 qos-group 0-2, 4-7 OS10 (config)# queue 3 qos-group 3 Quality of service 681