Moxa Technologies Moxa EtherDevice Switch EDS-405A - Manual (Page 34)

EDS-408A/405A Series User’s Manual Featured Functions
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In the event that one branch of the ring gets disconnected from the rest of the network, the protocol
automatically readjusts the ring so that the part of the network that was disconnected can
reestablish contact with the rest of the network.
Initial setup of a “Turbo Ring” or “Turbo Ring V2” ring
1. For each switch in the ring, select any two
ports as the redundant ports.
2. Connect redundant ports on neighboring
switches to form the redundant ring.
The user does not need to configure any of the switches as the master to use Turbo Ring or Turbo
Ring V2. If none of the switches in the ring is configured as the master, then the protocol will
automatically assign master status to one of the switches. In fact, the master is only used to
identify which segment in the redundant ring acts as the backup path. In the following subsections,
we explain how the redundant path is selected for rings configured for Turbo Ring, and Turbo
Ring V2.
Determining the Redundant Path of a “Turbo Ring” Ring
In this case, the redundant segment (i.e., the segment that will be blocked during normal operation)
is determined by the number of EDS units that make up the ring, and where the ring master is
located.
“Turbo Ring” rings with an even number of EDS units
Master
If there are 2N EDS units (an even number) in
the “Turbo Ring” ring, then the backup segment
is one of the two segments connected to the
(N+1)st EDS (i.e., the EDS unit directly
opposite the master).