Installation Manual

INS_RLXE4GE24MODMS_REV– 1 Jul 2016 PAGE 41
INSTALLATION AND OPERATION MANUAL RLXE4GE24MODMS
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Redundancy
C-Ring
C-Ring is one of the most powerful Ring technologies in the world. The recovery time of C-Ring is
less than 30 ms. It can reduce unexpected damage caused by network topology change. C-Ring
supports 3 different Ring topologies: Ring, Coupling Ring and Dual Homing.
C-Ring interface
The following table describes the labels in this screen.
Label Description
C-Ring Mark to enable Ring.
Ring Master There should be one and only one Ring Master in a ring. However if there are two
or more switches which set Ring Master to enable, the switch with the lowest MAC
address will be the actual Ring Master and others will be Backup Masters.
1st Ring Port The primary port, when this switch is Ring Master.
2nd Ring Port The backup port, when this switch is Ring Master.
Coupling Ring Mark to enable Coupling Ring. Coupling Ring can be used to divide a big ring into
two smaller rings to avoid effecting all switches when network topology change. It is a
good application for connecting two Rings.
Coupling Port Link to Coupling Port of the switch in another ring. Coupling Ring needs four switches
to build an active and a backup link.
Set a port as coupling port. The coupled four ports of four switches will be run in
active/backup mode.
Dual Homing Mark to enable Dual Homing. By selecting Dual Homing mode, Ring will be connected
to normal switches through two RSTP links (ex: backbone Switch). The two links work as
active/backup mode, and connect each Ring to the normal switches in RSTP mode.
Apply Click “Apply” to set the configurations.
Note: It is not recommended to set one switch as a Ring Master and a Coupling Ring at the same
time due to heavy load.