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    PTSP Overview

    The packet-triggered subscribers and policy control (PTSP) feature allows the application of policies to individual source IP addresses flowing through a given interface. A subscriber context is created for each distinct source IP address seen in a given underlying interface. This feature can be used to support dynamic subscribers that are controlled by a subscriber termination device, such as a B-RAS or GGSN device, that is connected to an MX Series 3D Universal Edge Router.

    PTSP has the following responsibilities:

    • Create a subscriber context for each distinct IPv4 address on a given interface (subscriber context).
    • Apply policies to or remove policies from the subscriber context.
    • Collect statistics and report for each individual policy for each subscriber context.
    • Derive information about subscribers.

    You can associate specific subscriber contexts based on IPv4 addresses and provide service activation and deactivation for these subscribers. The Multiservices DPC (MS-DPC) maintains a table of addresses for each subscriber and any corresponding policies. If an address is not found in the subscriber table, then a new subscriber context is created. All policies are defined on a per-subscriber basis. Once the subscribers are present in the subscriber table, PSTP enforces the policies active for the subscriber context. PTSP can report the subscribers to the SAE using the Diameter protocol so that the SRC software can manage the subscribers and services with dynamic policies. You can also configure static policies, but dynamic policies take precedence over static policies. When you download a new dynamic policy, it takes effect only for new flows. All new flows and TCP connections use the new dynamic policy. Existing flows are not affected by the new policy unless they timeout, after which they are considered a new flow.

    Statistics collection that is aggregated on a service rule basis is also shared with the SAE using the Diameter application. These statistics are not written to a flat file. Statistics collection that is aggregated on an application or application group basis is written to a flat file. These statistics are not shared with the SAE using the Diameter protocol.

    Hardware Requirements for PTSP for Subscriber Access

    PTSP is supported on Juniper Networks MX Series 3D Universal Edge Routers. You must have a Multiservices DPC (MS-DPC) on the MX Series router.

     

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    Modified: 2017-05-09