PACSystems Ethernet Switch SLM042 User Manual Section 5
GFK-3123A Jan 2020
Web Management 22
The following table describes the labels in this screen.
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.
The primary port, when this switch is Ring Master.
The backup port, when this switch is Ring Master.
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.
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.
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.
Click “Apply” to set 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.
5.4 RSTP
The Rapid Spanning Tree Protocol (RSTP) is an evolution of the Spanning Tree Protocol. It
provides faster spanning tree convergence after a topology change. The system also
supports STP and the system will auto detect the connected device that is running STP or
RSTP protocol.
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