DPI Traffics Steering only can be enabled for the following conditions:
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Outbound Policy Expert mode enabled.
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Supported Outbound Policy: Enforce and Priority
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Send all traffics deployment via SpeedFusion Tunnels.
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Multiple SpeedFusion Tunnels Between two Locations
- DPI Engine will steer the application traffics base on the defined applications via different subtunnels.
Detail info, you can also refer to the forum post below: