Siemens Industry, Inc. 33 A6V12198161_en--_a
Smart Infrastructure
7.3.11 Fiber Switch Ring Redundancy configuration in Layer 2
XNET over Ethernet Class X uses ring topology to connect the switches on the network. The two ends of
the bus are closed to form a ring by the fiber switch operating as a redundancy manager. The redundancy
function is enabled and disabled with the WEB interface. In contrast to the ring ports of the other switches,
the ring ports of the redundancy manager are disconnected when the network is operating problem-free.
The fiber switch operating in the redundancy manager mode monitors the connected bus over its ring
ports. It switches the ring ports through if there is an interruption on the connected bus. In other words, it
restores a functioning bus over this substitute path. Reconfiguration takes place within 0.3 seconds. As
soon as the problem has been eliminated, the original topology is restored—the ring ports in the
redundancy manager are once again disconnected from each other. After the RM (Redundancy Manager)
function has been enabled or after the RM has been switched through, this is indicated by the RM LED on
the housing.
NOTE: Only one switch can be configured as a redundancy manager (Master) in a ring. Follow the
steps listed below to enable the redundancy manager.
Figure 7–20: Layer 2 Configuration
1. Navigate to Menu >Layer 2 > Configuration to create a basic configuration for Ring
Redundancy.
2. Select Redundancy Type = Ring.
3. Select Redundancy Mode = HRP Manager only on one switch in the network.
4. Select HRP Client (or Automatic Redundancy Detection) on all the other of the switches on the
network.
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