B&B Electronics EIR618-2SFP-T - Manual (Page 34)

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Manual Documentation Number: EIR618-2SFP-T_5107m
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Dual Homing Application
The Dual Homing function is used to prevent a connection loss between the
X-Ring group and the upper level/core switch. Assign a port in each X-ring
group to be the Dual Homing ports The Dual Homing function can only be
used when the X-Ring function is active. Each X-Ring group can have one
Dual Homing port. Note: The upper level switches must have RSTP
enabled.
[NOTE]
In Dual Homing application architecture, the upper level switches
must enable the Rapid Spanning Tree protocol.