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Understanding IFL-Based Subscriber Setup

 

You use the CLI to configure an IFL-based subscriber for a particular interface or set of access interfaces. All user traffic that uses these interfaces belongs to the same subscriber session. The IFL-based subscriber session becomes active when at least one of its access interfaces is up.

You can specify the following types of interfaces:

  • Physical Layer 3 Ethernet interface

  • Layer 3 Aggregated Ethernet interface

  • Integrated routing and bridging (IRB) interface

  • IRB that contains Ether-channel and physical interface members

  • Logical Tunnel interface

You specify how an IFL-based subscriber’s traffic is processed by configuring the properties of the TDF domain in which the IFL-based subscriber is configured, which includes a pointer to the PCEF profile to assign to the subscriber.

When an IFL-based subscriber session is created, it is anchored on a session PIC based on a round-robin selection process. If a stand-alone session PIC goes down and any IFL-based subscribers are anchored on that PIC, the Service Control Gateway re-anchors a subscriber onto another session PIC.

An IFL-based subscriber session is deleted in the following situations:

  • All of the subscriber’s access interfaces are down. When at least one interface comes back up, the subscriber session is restored.

  • Subscriber is removed from the configuration with the CLI.

  • Subscriber is set to deactivate with the CLI.

  • Subscriber is cleared with the CLI. You can later restore the subscriber by using the revert option with the clear command.