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Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 29

Ethernet Infrastructure Components Chapter 2

Unmanaged versus Managed Switches

Unmanaged switches are relatively inexpensive and simple to set up, but they do

not provide any management capabilities, security, or diagnostic information.

Therefore, they are difficult to troubleshoot.

As a general rule for unmanaged switches, make sure of the following:

• Your application does not contain I/O traffic

• Your application has I/O control and the following is true:

– The network is not directly connected to the IT network

– All nodes on the network are Rockwell Automation devices

– There is no potential to overload a device with traffic

Managed switches are typically more expensive than unmanaged switches and

require some level of support for initial configuration and replacement. However,

managed switches provide advanced features, which can enable better network

performance in your control system. Managed switches are able to manage

multicast traffic and provide diagnostics data, security options, and other

advanced features.

Autonegotiation

Autonegotiation lets devices select the optimal way to communicate without

requiring you to configure the devices. However, if you connect a

manually-configured device to an autonegotiation device, a high rate of data

transmission errors can occur.

All 100 Mbps devices are required to support autonegotiation, but most existing

10 Mbps devices do not. Select a switch that supports both speeds to enable you

to connect to existing devices that use the slower rate.

Switch Type Advantages Disadvantages

Managed • Ability to manage multicast traffic

• Diagnostics data

• Security options

• Additional advanced features

• Network segmentation features

• Network resiliency features

• More expensive

• Requires some level of support and

configuration to start up and replace

Unmanaged • Inexpensive

• Simple to set up

• 'No Config' replacement

• No network segmentation

• No dagnostic information

• No port security

• No traffic management

• No network resiliency

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