Technical basics
4.4 Redundancy mechanism
SCALANCE XB-200 Web Based Management
22 Configuration Manual, 04/2015, C79000-G8976-C360-02
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 0.3
seconds.
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).
● HRP is supported in ring topologies with up to 50 devices.
In topologies with SCALANCE X-200 and SCALANCE X-300 IE switches, up to 100
nodes are supported.
Exceeding this number of devices can lead to a loss of data traffic.
● The ring in which you want to use HRP may only consist of devices that support this
function.
● 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. This configuration can be set in Web Based Management, Command
Line Interface or using SNMP. On all other devices in the ring, either the "HRP Client" or
"Automatic Redundancy Detection" mode must be activated. This can be achieved in
Web Based Management, Command Line Interface or using SNMP.
● In the basic status, the "HRP Client" or "Automatic Redundancy Detection" mode is set as
default.
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