Rockwell Automation Publication 1783-UM001B-EN-P - May 2010 19
Chapter
2
Network Services Setup
What This Chapter Contains
This chapter covers information related to network services setup to include the
following:
• Internet Group Management Protocol (IGMP) configuration
• Dynamic Host Configuration Protocol (DHCP) configuration
IGMP Configuration
Read this section for information about the IGMP snooping feature included in
the 1783-EMS switch.
IGMP snooping sorts multicasting devices into groups. This limits the multicast
packets received by hosts that do not need the information, making the network
more efficient and deterministic.
When and How to Use IGMP
Use IGMP when I/O is running on your network. IGMP helps to isolate this
UDP traffic to ports that need to receive it. When it is not used, other devices
may be slowed down by the continuous flow of UDP packets.
Option Description
Broadcast Without IGMP snooping, an I/O module acts like a broadcasting
device and all devices on the subnet are flooded with I/O traffic.
Multicast IGMP snooping filters the I/O traffic from devices that are not in
the intended multicast group.
Unicast A message instruction from one controller to another would be an
example of unicast; it contains one source and one destination
address.
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