Deleting a CTF

Use this procedure to delete an CTF.

This procedure describes the recommended steps for deleting an CTF from a Policy and Charging configuration. In this procedure, CTF refers to a Diameter peer of the PCA, which is sometimes referred to as an CTF Front-end.

The CTF procedure minimizes disruption to policy signaling by:

• Preventing sessions from creating new bindings to an CTF that has been removed
• Allowing sessions with existing bindings to continue to use an CTF that has been removed until those sessions terminate normally

The procedure describes the recommended steps for deletion of an CTF from a Policy and Charging configuration. In this procedure, CTF refers to a Diameter peer of the PCA, sometimes referred to as an CTF Front-End.

Note:

The PCRF removal procedure is restricted to SOAM servers.

1. Use Main Menu > Diameter > Configuration > Peer Nodes from the SOAM GUI page to determine the Peer Node name of the CTF(s) being removed.
2. Use Main Menu > Diameter > Configuration > Route Groups from the SOAM GUI page, use the GUI filter by Peer Node with the corresponding Peer Node name of the CTF. This will display only the Route Groups that are associated with the CTF.
3. From the same GUI page, determine if there are any Route Groups that contain other Peer Nodes in addition to the CTF to be removed.
   There are generally at least two Route Groups for each CTF. One Route Group with only the specified CTF peer, and one or more Route Groups with the specified CTF peer plus other CTF peers. The goal is to leave the route group with only the specified CTF peer, but delete the CTF peer from the other route groups. This allows routing for existing bindings to the OCS peer, but prevents alternate routing to the OCS peer.
4. From the same GUI page, edit each of the determined Route Groups and remove the OCS/OCS Front-End Peer Nodes from the Route Group.
   This prevents alternate routing selection of the OCS peer being removed.
5. Use Main Menu > Policy and Charging > Configuration > Online Charging DRA > OCSs from the SOAM GUI page to delete the OCS.
   This prevents new Bindings from using the OCS peer being removed.
6. After enough time has elapsed such that all Diameter sessions that could be bound to the OCS peer should have terminated normally, use Main Menu > Policy and Charging > Configuration > Online Charging DRA > OCSs on the SOAM GUI page to delete the route group containing only the OCS peer being removed.
7. Use Main Menu > Diameter > Maintenance > Connections from the SOAM GUI page to find the connection for the OCS Peer Node and disable it
8. Use Main Menu > Diameter > Maintenance > Connections from the SOAM GUI page to delete the connection to the OCS Peer Node.
9. Use Main Menu > Diameter > Configuration > Peer Nodes from the SOAM GUI page to delete the Diameter Peer Node for the OCS being removed.