Installation guide

Network Infrastructure for EtherNet/IP™
6-72
Infrastructure Application Scenarios
Figure 6-5 Isolated Network with One Controller.
EXAMPLE 3
In the example shown in Figure 6-5, IP multicast traffic is produced by 24 producers, remote I/O rails
and/or drives, and is consumed by the programmable controller. Assume that each producer establishes
one connection with the controller with a 10 ms RPI, and IGMP snooping is not activated in the switches.
Each producer will generate 100 multicast packets per second and will receive 2300 unwanted multicast
packets per second. The workstation will receive 2400 of unwanted multicast packets per second.
If the engineer concludes that unwanted multicast traffic affects system performance, then one of the
following recommendations may be considered:
• If only workstation performance is affected, the workstation can be connected to the
controller via a separate switch as shown in Figure 6-4. IGMP snooping does not have to
be activated in any of these switches.
8-port Switch
Producer 1
Programmable
Controller
Workstation
8-port Switch 1 8-port Switch 4
Producer 6 Producer 19 Producer 24