American Fibertek SM9p - Manual (Page 110)

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In the X-ring topology, every switch should enable X-ring function and assign two member
ports in the ring. Only one switch in the X-ring group would be set as a backup switch that
one of two member ports would be blocking, called backup port, and another port is called
working port. Other switches are called working switches and their two member ports are
called working ports. When the network connection failure, the backup port will
automatically become a working port to recovery the failure.
The switch can be set as the ring master or slave. The ring master has the rights to
negotiate and place command to other switches in the X-ring group. If there are 2 or
more switches are in master mode, then software will select the switch with lowest MAC
address number as the ring master.
The system also supports the coupling ring that can connect 2 or more X-ring group for
the redundant backup function.
 X-ring: to enable the X-ring function.
 Ring Master: Enable means the switch is ring master. Disable means the switch is
slave.
 1 st
& 2
nd
Ring Ports: select two ports as the member ports. One port will be working
port and one port will be the backup port. The system will automatically decide which
port is working port and which port is backup port.
 Coupling Ring: to enable the coupling ring function.
 Coupling port: select the member port.
 Control port: select the switch as the master switch in the coupling ring.