EDS-405A/408A Series User’s Manual
Featured Functions
3-22
NOTE
Port trunking and Turbo Ring can be enabled simultaneously to form a backbone. Doing so will
increase the bandwidth of the backbone, and also provide redundancy. For example, suppose that
two physical ports, 1 and 2, are trunked to form trunk group Trk1, and then Trk1 is set as one
Turbo Ring path, if port 1 gets disconnected, the remaining trunked port, port 2, will share the
traffic. If port 1 and port 2 are both disconnected, Turbo Ring will create the back up path within
300 ms.
The Turbo Ring Concept
Moxa developed the proprietary Turbo Ring protocol to optimize communication redundancy and
achieve a faster recovery time on the network.
The Turbo Ring and Turbo Ring V2 protocols identify one switch as the
master
of the network,
and then automatically block packets from traveling through any of the network’s redundant loops.
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.
