No.of gnb's support?

How many number of gnb’s does an free5gc support ?

Hi @weit,
Please refer to https://github.com/free5gc/free5gc/wiki/SMF-Config. You can try to add gNB2 in SMF configuration.

Hi,

We do not test our core network with real world gNB.
But in our design, there is no limitation on gNB numbers unless exceed the size of gNB ID defined by 3gpp’s spec.

Hi, can you please describe the process of adding an additional gNB to free5c core?

My setup contains a single gNB (UERANSIM) that is connected to AMF. My SMF configuration defines gNB as follows along with default links for UEs.

    up_nodes:
      gNB1:
        type: AN
        an_ip: 172.15.0.211
...
    links:
      - A: gNB1
        B: UPF5
      - A: gNB1
        B: UPF6
...

My SMF uerouting configuration also uses gNB1 for specific UE routing and this configuration properly works.

I have installed another gNB UERANSIM in a different VM set with tac: 2 and added this to AMF configuration (under supportTaiList):

  supportTaiList:  # the TAI (Tracking Area Identifier) list supported by this AMF
    - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
      tac: 1 # Tracking Area Code (uinteger, range: 0~16777215)
    - plmnId:
        mcc: 208
        mnc: 93
      tac: 2

I can successfully connect my additional gNB with AMF.

How do I update SMF configuration ?

Thanks in advance,
– Avi