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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, each switch should be enabled with the X-Ring function and two ports of each
switch should be configured 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, known as backup port, would be blocked
and the other 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 (blocked) of the master switch (Ring Master) will automatically become a working port to help
the entire group recover from the failure.
The switch supports the function and interface to configure the switch being a ring master. The ring
master can negotiate and place commands to other switches in the X-Ring group. If there are two or
more switches in master mode, the software will configure the switch with lowest MAC address number
as the ring master. The ring master mode can be enabled via the X-Ring configuration interface. Also, the
user can identify whether the switch is the ring master by checking the corresponding LED indicator on
the panel of the switch.
The system also supports the Couple Ring topology that can connect two X-Ring groups for the
redundant backup function. Besides, the Dual Homing topology can prevent connection lose between
the X-Ring group and the upper level/core switch.
• Enable X-Ring: To enable the X-Ring function, tick the check box beside the Enable Ring string label.
If this check box is not ticked, all the ring functions are unavailable.
Enable Ring Master: Tick the check box to enable this switch to be the ring master.
1st & 2nd Ring Ports: Pull down the selection menu to assign the ports as the member ports.
Ring Port is the working port and 2
1
st
the system will automatically upgrade the 2
st
Note
Both the 1
the same group of Port 1 ~ Port 8 or Port9 ~ Port16.
For example, if you assign Port 9 the 1
selected from among the group of Port 9 ~ Port 16.
• Enable Couple Ring: To enable the coupe ring function, tick the check box beside the Enable Couple
Ring string label.
Coupling Port: Assign the member port which is connected to the other ring group.
Control Port: When the Enable Couple Ring check box is ticked, you have to assign the
control port to form a couple-ring group between the two X-rings.
• Enable Dual Homing: Having ticked this check box, click the pull-down menu to select one port to be
the Dual Homing port which is the only one on the switch. Dual Homing function works only when the
X-Ring function is enabled.
• And then, click Apply
nd
t and the 2
Ring Ports must be designated by selecting ports from among
to have the configuration take effect.
Ring Port is the backup port. When 1
nd
Ring Port to be the working port.
nd
st
Ring Port, the 2
85
Ring Port fails,
st
nd
Ring Port certainly is
Chapter3
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