IP-Based Subscriber Setup Overview
The Service Control Gateway initiates an IP-based subscriber session when it receives a RADIUS accounting request from a gateway GPRS support node (GGSN), Packet Data Network Gateway (PGW), or broadband network gateway (BNG). An individual subscriber session is created for each unique source IP address.
The Service Control Gateway can receive a RADIUS accounting request in two ways:
When the Service Control Gateway is identified as a RADIUS server for the GGSN, PGW, or BNG, you configure the GGSN, PGW, or BNG as a RADIUS client of the Service Control Gateway. The RADIUS client sends the accounting request to a designated interface and IP address on the Service Control Gateway, which sends it to the subscriber processing module.
When the GGSN, PGW, or BNG does not treat the Service Control Gateway as a RADIUS server, you configure a filter called a snoop segment. The Service Control Gateway examines RADIUS accounting requests that pass through the MX Series router to determine whether they match the filter, which is known as snooping. When an accounting request matches the filter, the Service Control Gateway copies the request and sends it to the subscriber processing module.
You specify how an IP-based subscriber session is created and how a subscriber’s traffic is processed by configuring TDF domains and PCEF profiles, and configuring a selection process for applying them to subscribers. The selection process identifies the attribute-value pair (AVP) values in the RADIUS accounting start request that must be matched to select a particular TDF domain or PCEF profile.