diff --git a/usecase/backbone_usecase.go b/usecase/backbone_usecase.go
index 6ba58ae..8248084 100644
--- a/usecase/backbone_usecase.go
+++ b/usecase/backbone_usecase.go
@@ -82,7 +82,7 @@ func (u *backboneUseCase) CreateBackbone(backbone req.BackboneDTO) error {
         }
 
         // Validate port availability - each backbone uses 1 port regardless of core amount
-        if startDevicePort.PortAvailable < 1 {
+        if startDevicePort.PortAvailable < 1 && startDevice.DeviceType == "OTB" {
             return fmt.Errorf("start device has no available ports (available: %d, required: 1)", 
                 startDevicePort.PortAvailable)
         }