EDS-516A Series User’s Manual
Featured Functions
3-22
Redundancy Protocol
Setting
Description
Factory Default
Turbo Ring
Select this item to change to the
Turbo Ring configuration page.
None
RSTP (IEEE
802.1W/1D)
Select this item to change to the
RSTP configuration page.
None
Set as Master
Setting
Description
Factory Default
Enable/Disable
Select this EDS-516A as Master
None
Redundant Ports
Setting
Description
Factory Default
1st Port
Select any port of EDS-516A to be
one of the redundant ports.
Port 15 if enabled for
Turbo Ring
2nd Port
Select any port of EDS-516A to be
one of the redundant ports.
Port 16 if enabled for
Turbo Ring
Enable Ring Coupling
Setting
Description
Factory Default
Enable/Disable
Select this EDS-516A as Coupler
None
Coupling Ports
Setting
Description
Factory Default
Coupling Port
Select any port of EDS-516A to be
the coupling port
Port 2 if enabled for
Ring Coupling
Coupling Control Port
Select any port of EDS-516A to be
the coupling control port
Port 1 if enabled for
Ring Coupling
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 EDS-516A’s STP feature is disabled
by default. To be completely effective, you must enable RSTP/STP on every EDS-516A
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:
y
The topology of a bridged network will be determined much more quickly compared to STP.
y
RSTP is backward compatible with STP, making it relatively easy to deploy. For example:
¾
Defaults to sending 802.1D style BPDUs if packets with this format are received.
¾
STP (802.1D) and RSTP (802.1W) can operate on different ports of the same EDS-516A.
This feature is particularly helpful when EDS-516A ports connect to older equipment,
such as legacy switches.
You get essentially the same functionality with RSTP and STP. To see how the two systems differ,
see the
Differences between RSTP and STP
section in this chapter.