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Understanding the Definition of a Set of IP-Based Subscriber Properties with a TDF Domain

 

A traffic detection function (TDF) domain identifies a set of properties for creating a TDF IP-based subscriber session and specifying how TDF subscriber traffic is processed. You can create several TDF domains if you have multiple categories of subscribers. You configure a selection process to assign IP-based subscribers to a TDF domain. Multiple subscribers can be assigned to the same TDF domain.

IP-based TDF domains include the following information:

  • An IP-based type of subscriber.

  • The TDF logical interface (mif) that handles the subscriber traffic. A TDF interface is distinct from other types of interfaces and is used to associate a TDF domain’s subscribers with an access interface in a virtual routing and forwarding table (VRF). The TDF logical interface also identifies the TDF service set that is applied to the traffic.

  • (Optional) The PCEF profile that must be applied to the TDF subscriber. The PCEF profile specifies how to apply policy and charging rules to the TDF subscriber traffic. If the TDF domain does not specify a PCEF profile, you must configure a PCEF profile selection process in addtion to the TDF domain selection process.

  • Source IP addresses for uplink traffic and destination IP addresses for downlink traffic that you do not want to undergo TDF processing.

  • Idle timeout and maximum number of subscribers for the TDF domain.

  • Source IP addresses for users who can become TDF subscribers, using address pools.

  • (Not applicable to snooped messages) The enabling or disabling of an immediate RADIUS response message from the Service Control Gateway to the accounting start message received from a gateway GPRS support node (GGSN), Packet Data Network Gateway (PGW), or broadband network gateway (BNG) RADIUS client.

  • The method for constructing the Subscription-Id for the Diameter credit control request (CCR) message that is sent from the TDF to the PCRF for a TDF subscriber.

  • The local policy (drop/forward packets, maximum bit rate, burst size) to apply to the subscriber packets entering the access interface of the TDF domain if a TDF subscriber session does not exist.

  • One or more interfaces that face the access network and can carry traffic for the TDF subscriber.