Hrp - Siemens SCALANCE XB-200 Configuration Manual

Technical basics
4.4 Redundancy mechanism
4.4.2

HRP

HRP - High Speed Redundancy Protocol
HRP is the name of a redundancy method for networks with a ring topology. The switches
are interconnected via ring ports. One of the switches is configured as the redundancy
manager (RM). The other switches are redundancy clients. Using test frames, the
redundancy manager checks the ring to make sure it is not interrupted. The redundancy
manager sends test frames via the ring ports and checks that they are received at the other
ring port. The redundancy clients forward the test frames.
If the test frames of the RM no longer arrive at the other ring port due to an interruption, the
RM switches through its two ring ports and informs the redundancy clients of the change
immediately. The reconfiguration time after an interruption of the ring is a maximum of 300
ms.
Standby redundancy
Standby redundancy is a method with which rings each of which is protected by high-speed
redundancy can be linked together redundantly. In the ring, a master/slave device pair is
configured and these monitor each other via their ring ports. If a fault occurs, the data traffic
is redirected from one Ethernet connection (standby port of the master or standby server) to
another Ethernet connection (standby port of the slave).
Requirements
● HRP is supported in ring topologies with up to 50 devices.
Exceeding this number of devices can lead to a loss of data traffic.
● For HRP, only devices that support this function can be used in the ring.
● Devices that do not support HRP must be linked to the ring using special devices with
HRP capability. Up to the ring, this connection is not redundant.
● All devices must be interconnected via their ring ports. Multimode connections up to 3 km
and single mode connections up to 26 km between two IE switches are possible. At
greater distances, the specified reconfiguration time may be longer.
● A device in the ring must be configured as redundancy manager by selecting the "HRP
manager" setting. On all other devices in the ring, either the "HRP Client" or "Automatic
Redundancy Detection" mode must be activated.
● You configure HRP in Web Based Management, Command Line Interface or using
SNMP.
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SCALANCE XB-200/XC-200/XP-200 Web Based Management
Configuration Manual, 07/2016, C79000-G8976-C360-04