User manual

158 Publication ENET-UM001I-EN-P - January 2010

Chapter 11 Troubleshoot an EtherNet/IP Module

This example assumes that the switch does not support IGMP snooping

querier function, so a router is required.

IGMP Snooping Example

Virtual Local Area Networks

With a managed switch, you can establish virtual local area networks (VLAN)

to segregate various kinds of network traffic and also increase security between

your networks. You could create multiple isolated networks so that the traffic

from one network does not burden the other network.

As with IGMP snooping, VLAN can control multicast traffic. However, unlike

MP snooping, VLAN can also control and block:

· unicast traffic.

· broadcast traffic.

Virtual Local Area Networks (VLAN)

Plant Network

Router sends out IGMP polls to

determine members of a multicast group.

Switch listens to the polls and responses and

identifies members of each multicast group.

Controller

(Consumer)

I/O

(Multicast Producer)

I/O

(Multicast Producer)

I/O

(Multicast Producer)

Controller A

Workstation

Controller B

VLAN A

VLAN 2

I/O I/O I/OI/O

I/O

Switch