B&B Electronics EIR505-XX - Manual (Page 27)

Manual Documentation Number: EIR505-xx_5107m 17
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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] In the Dual Homing architecture, the upper level switches must
have Rapid Spanning Tree protocol enabled.