Reference Guide

OS10 device monitors the current level of trac rate at xed intervals, compares the trac rate with congured levels, and drops excess
trac.
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 conguration.
Congure 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 simplied network management. RDMA was traditionally supported only in an
InniBand 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, congure the QoS service policy on the switch, and in the ingress and egress directions on all the interfaces. See
Congure RoCE on the switch for more information about this conguration.
Congure RoCE on the switch
The following example describes the steps that you need to perform to congure RoCE on the switch. This conguration 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 trac. You can congure any value from 1 to 4093.
OS10 (config)# interface vlan 55
4 Create a network-qos type class-map for priority ow 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