Service Bridge – Setup and Configuration
Entry ID: 109747975, V1.4, 05/2019
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4.2.6 Loop detection
The loop detection values are configured in the "Layer 2 > Loop Detection" menu.
Loop detection is a function which serves to detect loops in the network and to limit
their effects. The following settings are provided for the Service Bridge:
Layer 2 > Loop Detection
Figure 4-12
(1) The "Loop Detection" and "VLAN Loop Detection" functions are activated.
(2) Except for Port 1, all the ports are configured as "transmitters", i.e. they emit
"Loop Detection Message frames". Port 1 remains with the default setting
"Forwarder".
(3) The "Threshold" is configured to 2. This means that if two message frames are
emitted by the Service Bridge itself and return to it within 1000 ms, it is
assumed that a loop is present. Reaction (5) or (6) takes place.
(4) The "timeout" time is set to 60 s, which means that a check is performed every
60 seconds to see whether the loop is still present. If a loop is no longer
present, the port is reactivated.
(5) "disable" is configured for all ports as a "Remote Reaction", i.e. as a response
to the detection of a remote loop. This means that if a remote loop is detected
on a port, the port is blocked.
(6) "Disable" is configured for all ports as a "Local Reaction", i.e. as a response to
the detection of a local loop. This means that if a local loop is detected on a
port, the port is blocked.
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