B&B Electronics EIR508-T - Manual - Manual (Page 51)

Manual Documentation Number: EIR508-2xx-T 1713m 51
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X-Ring
X-Ring provides network redundancy similar to the Spanning Tree and
Rapid Spanning Tree Protocols. However, recovery time is greatly reduced
when the X-Ring protocol is used. The protocol identifies one switch as the
Ring Master. Packets are blocked from the redundant path unless a ring
member becomes disconnected from the rest of the network. When this
happens, the protocol automatically restores connectivity using the
redundant path.
In the X-Ring topology, every switch should enable X-Ring function and
assign two member ports to the ring. Only one switch in the X-Ring group
would be set as the backup switch. Other switches are called working
switches and their two member ports are called working ports. If a network
connection failure occurs, the backup port will automatically become a
working port to recover.
The switch has a Dipswitch to configure the switch as the ring master. The
ring master has the rights to negotiate and place a command to other
switches in the X-Ring group. If more than one switch is in master mode,
the software will select the switch with lowest MAC address number as the
ring master. An LED on the front panel indicates that the switch is the ring
master.
Coupling ring is used to connect 2 or more X-Ring groups providing a
redundant back-up Dual homing is used to recover from a connection loss
between an X-Ring group and the upper level/core switch.
X-Ring provides a faster redundant recovery than Spanning Tree topology.
The action is similar with STP or RSTP, but the algorithms not the same.
 Enable X-Ring: Mark the check box to enable the X-Ring function
 1 st
& 2
nd
Working Ports: Assign 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.
 Enable Coupling Ring: Mark the check box to enable the coupling ring