Redundant Ethernet Ring Setup - Moxa Technologies EtherDevice User Manual

Redundant Ethernet Ring Setup

MOXA EtherDevice Server supports two redundancy protocols for
Redundant Ring Setup. You can choose which protocol is best suited
for your own network's topology. For Spanning Tree Protocol (IEEE
801.1D) we highly recommended establishing ports 7 and 8 as portals for
communicating with other devices on the network.
When Spanning Tree Protocol (IEEE 801.1D) is enabled, you should
connect ports 7 and 8 to the network (instead of to a device). That is, these
ports should connect to a HUB, switch, or another MOXA EtherDevice
Server, provided the opposing device is connected to the rest of the
network.
NOTE We suggest not enabling Spanning Tree Protocol for a port once
the port is connected to a device (PLC, RTU, etc.) as opposed to
network equipment. The reason is that it will cause unnecessary
negotiation.
For Turbo Ring, you can only connect port 8 of one EDS to port 7 of
another EDS for fast redundant recovery time.
See the Communication Redundancy section from Chapter 3 of the User's
Manual for more information about EDS's Redundant Ring feature.
MOXA EtherDevice Server User's Manual
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