American Fibertek SM9p - Manual (Page 19)

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port to the failure. In the X-Ring group, switches are setting as “slave mode” by default,
but one must be the “master mode”. If there are 2 or more switches in master mode, then
software will automatically select the switch with lowest MAC address number as the ring
master. The ring master has the rights to negotiate and command to other switches in the
X-Ring group.
If link failure; the ring master is alerted and invokes its back port to rebuild the network
detection of link failure activation of master’s backup link and address table. The link
failure is, the ring slaves will the ring master to restore normal operation by disabling the
backup link the network is re in less than 300ms.
Coupling Ring Application
In the network, it may have more than one X-Ring group. By using the coupling Ring
function, it can connect each X-Ring for the redundant backup. It can ensure the transmissions
between two ring groups not to fail. The following figure is a sample of coupling ring application.
The couple ring consists of four switches—switch 1 ~ switch 4—which are connected to each
other via the paths in red. Please note that the Coupling Ring Backup Path between switch 1
and switch 3 is blocked; it will work only when the path between switch 2 and switch 4 is
broken or disconnected.