Moxa Technologies Moxa EtherDevice Switch EDS-405A - Manual (Page 42)

EDS-408A/405A Series User’s Manual Featured Functions
3-27
Coupling Mode
Setting Description Factory Default
Dual Homing
Select this item to change to the
Dual Homing configuration page
EDS-408A
Primary Port:
port 5
Backup Port: port 6
EDS-405A
Primary Port:
port 2
Backup Port: port 3
Ring Coupling
(backup)
Select this item to change to the
Ring Coupling (backup)
configuration page
EDS-408A: Port 5
EDS-405A: Port 2
Ring Coupling
(primary) Select this item to change to the
Ring Coupling (primary)
configuration page
EDS-408A: Port 5
EDS-405A: Port 2
Primary/Backup Port
Setting Description Factory Default
Primary Port
Select any port of the EDS to be the
primary port. EDS-405A: port 2
EDS-408A: port 5
Backup Port
Select any port of the EDS to be the
backup port. EDS-405A: port 3
EDS-408A: port 6
NOTE The Turbo Ring DIP Switches located on the
EDS-408A/405A’s outer casing can be used to
configure the EDS’s Turbo Ring protocols. (For
details on how to do this, refer to “Configuring Basic
Settings—Turbo Ring DIP Switch” section in this
manual.)
If you use the web interface, console interface, or
Telnet interface to enable the Turbo Ring DIP
Switches, and then set DIP Switch 4 on the switch’s
outer casing to the “ON” position, you will not be able
to use the web interface, console interface, or Telnet
interface to change the status of the DIP Switch. In
this case, the Communication Redundancy settings
will be “grayed out” in the web browser as shown in
the following figure:
The STP/RSTP Concept
Spanning Tree Protocol (STP) was designed to help reduce link failures in a network, and provide
protection from loops. Networks that have a complicated architecture are prone to broadcast
storms caused by unintended loops in the network. Moxa EtherDevice Switch’s STP feature is
disabled by default. To be completely effective, you must enable RSTP/STP on every EDS
connected to your network.
Rapid Spanning Tree Protocol (RSTP) implements the Spanning Tree Algorithm and Protocol
defined by IEEE Std 802.1w-2001. RSTP provides the following benefits: