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EDS-508 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 as Master None
Redundant Ports
Setting Description Factory Default
1
st
Port
Select any port of EDS to be one
of the redundant ports.
Port 7 if enable Turbo
Ring
2
nd
Port
Select any port of EDS to be one
of the redundant ports.
Port 8 if enable Turbo
Ring
Enable Ring Coupling
Setting Description Factory Default
Enable/Disable Select this EDS as Coupler None
Coupling Ports
Setting Description Factory Default
Coupling Port
Select any port of EDS to be the
coupling port
Port 5 if enable Ring
Coupling
Coupling Control
Port
Select any port of EDS to be the
coupling control port
Port 6 if enable Ring
Coupling
The Concept of STP/RSTP
The Spanning Tree Protocol (STP) makes your network more resilient to link failure and also
provides a protection from loops—one of the major causes of broadcast storms. STP is disabled by
default on EDS. To be fully effective, RSTP/STP must be enabled on all EDSs connected to your
network.
The Rapid Spanning Tree Protocol (RSTP) is an enhanced Spanning Tree feature. RSTP
implements the Spanning Tree Algorithm and Protocol, as defined in the IEEE Std 802.1w-2001.
Some of the benefits of RSTP are:
# Faster determination of the topology throughout a bridged network.
# Easy deployment throughout a legacy network, through backward compatibility:
$ Will default to sending 802.1D style BPDU’s on a port if it receives packets of this
format.
$ It is possible for some ports on an EDS to operate in RSTP (802.1w) mode, and other
ports, for example those connected to a legacy switch, to operate in STP (802.1D)
mode.
RSTP provides the same functionality as STP. For details on how the two systems differ, see the
How RSTP Differs from STP section in this chapter. The following sections explain more about