fido2100 3-Port Industrial Ethernet DLR Switch with IEEE1588
Data Sheet
April 10, 2013
The COTS switch must be configured so that ring protocol messages are not forwarded to devices
connected to it. IGMP snooping and multicast filtering must be disabled on 2 ports of the COTS switch
directly connected to ring to facilitate rapid network reconfiguration. Since unicast filtering cannot be
disabled in a COTS switch, it may take couple of CIP connection RPI’s for some data packets to be
delivered correctly on some nodes after a network reconfiguration. Ring timing parameters such as
beacon period and timeout must account for the presence of a COTS switch directly in ring. Typical
network recovery time for a ring containing 50 nodes will be less than 1 millisecond for most types of
faults on a loaded network with mostly EtherNet/IP frames. Further details of ring topology and
protocol are described in, “Device Level Ring Protocol”; see CIP Networks Library, Volume 2,
Chapter 9, Edition 1.7 or later (see www.odva.org for details).
It is possible to create complex ring topologies. Some examples are: a backbone ring connecting
multiple star topologies; a backbone star connecting multiple ring topologies; a backbone ring
connecting multiple ring topologies; and other combinations.
Most dual/three port devices operate as simple ring nodes and require no special configuration. By
default they will power up in daisy chain mode and transparently switch to ring mode upon receiving
beacon frames from ring supervisor.
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