Federated mode and Local break-out ?

[ferrieux]

Hi,

We have configured Magma with inbound roaming to a PLMN, and would like to do local break-out, meaning:

• user plane local to the AGW
• control plane with remote HSS

However, we only have two options local_subscriber and s8_subscriber and none of them does the job:

• local_subscriber does the local user plane but only queries the local subscriberdb for control
• s8_subscriber does the remote HSS control, but also insists on having a remote S8 for user plane => no local break-out

Is there a way out ?

[panyogesh]

@ferrieux : This would need investigation. It seems it was tried before. Can you please help us in identifying the priority. I can put a proposal to verify it in next release (post 1.9).

[ferrieux]

In the meantime, I found the solution, in the source: there is a third option named SPGW_SUBSCRIBER that does exactly that.

Note, this option is not exposed in the configuration language, but can be nonetheless selected by omitting the intended PLMN from the federated_mode_mapping->mapping list. For example, the config below sets PLMNs 00101, 00102, and 00103 respectively to LOCAL_SUBSCRIBER, S8_SUBSCRIBER, and SPGW_SUBSCRIBER: the latter by the mere absence of 00103 from the list.

"federated_modes_mapping": {
    "enabled": true,
    "mapping": [
      {
         "mode": "local_subscriber",
         "plmn": "00101"
      },
      {
         "mode": "s8_subscriber",
         "plmn": "00102"
      }
    ]
}

You might decide to keep it that way, but It might be worth documenting this at least :)
A more user-friedly would be to define a new config value "spgw_subscriber". Your call.