Reference Guide

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 Layer 2 and Layer 3
physical interfaces.
In the storm control unknown unicast configuration, both the unknown unicast and unknown multicast traffic are rate-limited.
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
Quality of service
645