Hirschmann RS20 Programming Manual page 70

Ring/Network coupling
To avoid continuous loops, the Switch sets the port state of the coupling
port to "off" if you:
– switch off operation or
– change the configuration
while the connections are in operation at these ports.
Note: The following settings are required for the coupling ports (you
select the Basic Settings:Port Configuration dialog):
– Port: on
– Automatic configuration (autonegotiation):
on for twisted-pair connections
– Manual configuration: 100 Mbit/s FDX
for glass fiber connections
Note: If VLANS are configured, note the VLAN configuration of the
coupling and partner coupling ports.
In the Network/Ring Coupling configuration, select for the coupling and
partner coupling ports
– VLAN ID 1 and "Ingress Filtering" disabled in the port table and
– VLAN membership U in the static VLAN table.
Note: If you are operating the Ring Manager and two-Switch coupling
functions at the same time, there is the risk of creating a loop.
Redundancy mode
In the "Redundancy Mode" frame, select
– "Redundant Ring/Network Coupling" or
– "Extended Redundancy".
70
5.2 Preparing a Ring/Network coupling
(see fig. 33)
Redundanz L2P
Release 5.0 04/09