INS_CWGE28FX4TX24MS_REV– 08/31/12 PAGE 36
INSTALLATION AND OPERATION MANUAL
CWGE28FX4TX24MS
TECH SUPPORT: 1.888.678.9427
Redundancy
C-Ring
C-Ring is the most powerful Redundant Ring 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 Ring
topology: C-Ring, Coupling Ring and Dual Homing.
Ring interface
The following table describes the labels in this screen.
Label
Description
Redundant Ring Mark to enable C-Ring.
Ring Master
There should be one and only one Ring Master in a ring. However if there are two or more
switches that 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 need four switch to build
an active and a backup link.
Set a port as coupling port. The coupled four ports of four switches will be run at active/
backup mode.
Dual Homing
Mark to enable Dual Homing. By selecting Dual Homing mode, C-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 C-Ring to the normal switches in RSTP mode.
Save
Save the configurations.
Note: We don’t suggest you to set one switch as a Ring Master and a Coupling Ring at the same
time due to heavy load.
