When the Appliance Can Apply the Optimization Policy

This diagram shows how the appliance processes a flow assigned to a tunnel.

1	The Route Policy checks traffic incoming from the LAN against the MATCH criteria. Entries 10 and 20 don’t match the traffic, but Entry 30 does.

2	The policy applies the entry’s SET actions to the identified flow. In this case, it directs the flow to Tunnel C. Once any traffic matches an entry, no subsequent entries are examined.

3	Before the flow reaches Tunnel C, the QoS Policy checks against its entries and

•	applies the DSCP marking specified for LAN QoS, and

•	assigns the flow to a traffic class. Here, the application, ssh, matches to the pre-defined application group, interactive, so the appliance assigns the flow to Traffic Class 3.

•	passes the flow to the Optimization Policy for optimizations, accelerations, and compressions. The Optimization Policy only applies to tunnelized traffic.

4	After optimization, the flow queues to Traffic Class 3 for shaping.

5	QoS Policy applies the DSCP markings for the WAN QoS.

6	The optimized flow exits the WAN interface.

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