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Ethernet Switch Features Important to EtherNet/IPCopyright © 2005 Rockwell Automation, Inc. All rights reserved.
Switch Features are ImportantThe proper selection of switches to be used in real-time (I/O) EtherNet/IP networks is critical. There are several features that are very important and can provide the appropriate infrastructure for your application. The following features need to be considered: Required: Full-duplex capability on all ports IGMP Snooping Port Mirroring Recommended: VLAN Auto-negotiation and manually configurable speed/duplex Wire-speed switching fabric SNMP for switch management IEEE 802.1D Spanning Tree Protocol Desirable: see last slide Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Copyright © 2005 Rockwell Automation, Inc. All rights reserved.Full-duplex Full-duplex capability on all ports: Full duplex capability eliminates collisions on the wire due to the separate transmit and receive channels for each device. Combined with the speed of switches available today, delays related to collisions or traffic in the switch can be made negligible. The end result is you can achieve a high degree of determinism with an EtherNet/IP network and it works well for I/O control. Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Internet Group Multicast Protocol (IGMP) SnoopingIGMP snooping constrains the flooding of multicast traffic by dynamically configuring switch ports so that multicast traffic is forwarded only to ports associated with a particular IP multicast group. Switches that support IGMP snooping “learn” which ports have devices that are part of a particular multicast group and only forward the multicast packets to the ports that are part of the multicast group. Sends out IGMP polls to determine who is in a multicast group to plant network Listens to the polls and responses to determine who is in each multicast group Layer 3 Switch or Router Layer 2 Switch Layer 2 Switch Controller I/O (Multicast Producer) (Consumer) Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
IGMP Snooping - continuedNormally, a commercial layer 2 switch that “supports” IGMP snooping needs a router (which could be a layer 3 switch) to send out the IGMP polls in order to learn what devices are part of the multicast group. *** IMPORTANT *** Some industrial layer 2 switches support IGMP snooping without the requirement for a router or layer 3 switch to be present to send out the IGMP polls. to plant network Note that none of the multicast traffic hits the router Layer 3 Switch or Router Layer 2 Switch Layer 2 Switch Controller I/O (Multicast Producer) (Consumer) Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Copyright © 2005 Rockwell Automation, Inc. All rights reserved.Port Mirroring Port Mirroring: Port mirroring refers to the ability to direct a duplicate of the frames being transmitted on one port to another port. This allows a traffic analyzer to be connected to a switch and have the ability to monitor the traffic on a given port. Without port mirroring, an analyzer is not able to see frames on other ports. Traffic analyzers are used extensively by people who support Ethernet networks. Therefore, it is critical that a switch is selected that supports port mirroring so that a traffic analyzer will function correctly on the network. Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Virtual Local Area Networks (VLANs)The benefits of VLANs are that a switch can be configured to handle two isolated networks without the traffic from one network burdening the other. IP multicast traffic from VLAN 1 will not reach VLAN 2. For multicast traffic, you could accomplish the same thing with IGMP snooping. However, a VLAN will also block unicast and broadcast traffic, and adds a measure of security between networks. I/O Controller1 PC Controller2 1 2 3 4 5 6 7 8 VLAN 1 VLAN 2 Switch Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Auto-negotiation / Manually Configurable Speed/DuplexAuto-negotiation and manually configurable speed/duplex: Auto-negotiation allows devices to select the most optimal way to communicate without the user having to configure the devices. If a manually configured device is attached to an auto-negotiation device there can be problems which result in a high rate of CRC errors. While all 100 Mbps devices are required to support auto-negotiation, most existing 10 Mbps devices do not. Two other areas where this switch feature can be helpful include when fibers converters are used in a system (auto-negotiation is not supported by fiber links) and to eliminate potential incompatibilities in the implementation of the auto-negotiation by different device vendors. Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Wire-speed Switching FabicWire-speed switching fabric: The switch fabric capacity is a measure of the maximum traffic that a switch can handle without dropping a packet. Wire speed switching fabric refers to a switch that can handle the maximum data rate of the network on each of its ports. Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Simple Network Management Protocol (SNMP)SNMP, Simple Network Management Protocol, is a TCP/IP protocol used to obtain statistical information about a device. SNMP software is very popular with network managers. It allows a network manager to view and modify a wide variety of network parameters, and also provides a common way to manage many diverse vendor products utilizing a single Network Management Tool. Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
IEEE 802.1D Spanning Tree ProtocolEthernet infrastructures can be designed to provide redundant backbone connections for improved fault tolerances. The Spanning Tree Protocol is to ensure that although multiple paths may exist between two devices connected to the infrastructure, only a single path will be used for communications at any one time. The switch should have the ability to enable and disable this feature on a per port basis. Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
Desirable Switch FeaturesIEEE 802.1p Frame Prioritization IP address blocking Restricts traffic to IP Addresses in specific range (down to one) DHCP Option 82 Limited DHCP Server (for small systems) Auto-restore of switch config on replacement Per port broadcast and multicast storm control Port Trunking for applications with many switches Various security functions Copyright © 2005 Rockwell Automation, Inc. All rights reserved.
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