Symptom:
Traffic flows through the X1 interface even when the WAN Connection Model is configured as 3G-only.
Condition or Workaround:
Occurs when the network cable is connected, but the system is configured to use 3G-only.
Resolution:
Upgrading to SonicOS Enhanced 5.5.0.0 release resolves the issue.
Tracking ID: <80992>
Source: SonicOS Enhanced 5.5.0.0 Release Notes