Moxa Technologies EDS-508 user manual Concept of STP/RSTP

EDS-508 Series User’s ManualFeatured Functions

Redundancy Protocol

	Setting	Description	Factory Default
	Turbo Ring	Select this item to change to the	None
		Turbo Ring configuration page.
	RSTP (IEEE	Select this item to change to the	None
	802.1W/1D)	RSTP configuration page.
Set as Master

	Setting	Description	Factory Default
	Enable/Disable	Select this EDS as Master	None
Redundant Ports
	Setting	Description	Factory Default
	1st Port	Select any port of EDS to be one	Port 7 if enable Turbo
		of the redundant ports.	Ring
	2nd Port	Select any port of EDS to be one	Port 8 if enable Turbo
		of the redundant ports.	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	Port 5 if enable Ring
		coupling port	Coupling
	Coupling Control	Select any port of EDS to be the	Port 6 if enable Ring
	Port	coupling control port	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

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