VPM dynamically maps IP priority levels into SVC's transmission priorities. For each downstream packet, VPM obtains the IP priority associated with the packet. It then locates the SVC in its SVC table and sends the packet to its destination with the correct TP. VPM maps IP packets with "high" priority to the highest SVC, while IP packets with a "low" priority are sent to the lowest SVC.
If VPM cannot locate a SVC for a given priority, it searches the SVC table for another one that addresses to the same destination but with the next highest priority. This allows VPM to send out the packet even if only one SVC is available. This also ensures that the SVC with the highest TP will not be shared (as long as there are not two applications sending IP packets with a "high" priority).
The illustration below shows IP filtering and prioritization over a frame relay management (IP, ADP, VPM, and FR).
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Example Using IP Prioritization Configuration on a Three Node Network
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