American Fibertek SM9p - Manual (Page 169)

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IGMP Configuration interface
X-ring
X-Ring provides a faster redundant recovery than Spanning Tree topology. The action is
similar to STP or RSTP, but the algorithms between them are not the same.
In the X-Ring topology, every switch should be enabled with X-Ring function and two ports
should be assigned as the member ports in the ring. Only one switch in the X-Ring group
would be set as the master switch that one of its two member ports would be blocked,
called backup port, and another port is called working port. Other switches in the X-Ring
group are called working switches and their two member ports are called working ports.
When the failure of network connection occurs, the backup port of the master switch (Ring
Master) will automatically become a working port to recover from the failure.
The switch supports the function and interface for setting the switch as the ring master or
not. The ring master can negotiate and place command to other switches in the X-Ring
group. If there are 2 or more switches in master mode, the software will select the switch