Technical basics
3.6 Redundancy
SCALANCE SC-600 Web Based Management (WBM)
Configuration Manual, 10/2021, C79000-G8976-C475-03
45
Compatibility with predecessor products
You can only transfer SNMPv3 users to a different device if you have created the users
as migratable users. To create a migratable user the "SNMPv3 User Migration" function
must be activated when you create the user.
3.6 Redundancy
3.6.1 HRP
HRP - High Speed Redundancy Protocol
HRP is the name of a redundancy method for networks with a ring topology. The devices
are interconnected via ring ports. One of the devices is configured as the redundancy
manager (RM). The other devices 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.
Requirements
HRP
• 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, the "HRP Client" mode must be
activated.
• The standby ports must be disabled in spanning tree.
• You configure HRP in Web Based Management, Command Line Interface or using
SNMP.
• With standby coupling partners HRP must be set permanently.
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