For seamless interoperability between the JUNOS packet gateway and PGC devices, you can control the method and reason that the VPG includes in ServiceChange commands that it sends to the PGC. You can also prevent the system from being overloaded with messages for certain state changes by specifying that the VPG not send a request or notification when those changes occur.
You can specify the method and reason that the VPG includes in ServiceChange commands when the state of one of the following changes: