Rapid Spanning Tree Protocol; Figure 174: Hsr Application In The Substation; Figure 175: Ied Attached To Redundant Ethernet Star Or Ring Circuit - GE P4A Technical Manual

P54A/B/C/E
DS Agile gateways
Px4x
Px4x
Bay 1
E01066

Figure 174: HSR application in the substation

5.4

RAPID SPANNING TREE PROTOCOL

RSTP is a standard used to quickly reconnect a network fault by finding an alternative path. It stops network loops
whilst enabling redundancy. It can be used in star or ring connections as shown in the following figure.
Switch 1
IED 1
Star connection with redundant ports
managed by RSTP blocking function .
V01010

Figure 175: IED attached to redundant Ethernet star or ring circuit

The RSTP implementation in this product is compatible with any devices that use RSTP.
RSTP can recover network faults quickly, but the fault recovery time depends on the number of devices on the
network and the network topology. A typical figure for the fault recovery time is 300ms. Therefore, RSTP cannot
achieve the "bumpless" redundancy that some other protocols can.
Refer to IEEE 802.1D 2004 standard for detailed information about the opration of the protocol.
P54xMED-TM-EN-1
H49
Px4x Px4x
Switch 2
IED 2
T1000 switch
H49
Px4x
Bay 2
Switch 1
IED 1
Ring connection managed by RST P
blocking function on upper switches
and IEDs interconnected directly .
Chapter 17 - Communications
PC SCADA
H49
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Px4x Px4x
Bay 3
Switch 2
IED 2
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