Connectivity 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 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).
To enable RRoCE, configure the QoS service policy on the switch in ingress and egress directions on all the interfaces. For more
information about this configuration, see Configure RoCE on the switch.
Configure RoCE on the switch
The following example describes the steps to configure RoCE on the switch. This configuration example uses priority 3 for
RoCE.
1. Enter 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, VLAN 55 switchs 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 OS10(config-cmap-nqos)# 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
Quality of service
937