Support for Multiple DNNs per Device Group with a Single UPF

[anaswarac-dac]

📌 Description:
This PR introduces support for associating multiple DNNs to a single device group in the 5G Core, enabling flexible and scalable configurations in deployments with a single UPF.

✅ Key Highlights:
Introduced configuration support for multiple DNNs per IMSI range in the sdcore-5g-values.yml file.

Each DNN can have its own:

IP pool

MTU

DNS

UE QoS profile (including MBR uplink/downlink and traffic class)

Validated end-to-end traffic flow for both ims and internet DNNs over the same UPF.

📂 Configuration Changes (in sdcore-5g-values.yml):

✅ device-groups Section:

ip-domains list now includes multiple DNNs (ims, internet) under a single group (gnbsim-user-group1).
ip-domain-expanded changed to ip-domains
Each DNN is mapped to a different ue-ip-pool and ue-dnn-qos.
device-groups:
- name: "gnbsim-user-group1"
imsis:
- "208930100007487"
- "208930100007488"
- "208930100007489"
- "208930100007490"
- "208930100007491"
- "208930100007492"
- "208930100007493"
- "208930100007494"
- "208930100007495"
- "208930100007496"
ip-domain-name: "pool1"
ip-domains:
- dnn: ims
dns-primary: "8.8.8.8"
mtu: 1400
ue-ip-pool: "172.252.0.0/16"
ue-dnn-qos:
dnn-mbr-downlink: 2400
dnn-mbr-uplink: 1200
bitrate-unit: Kbps
traffic-class:
name: "platinum"
qci: 5
arp: 1
pdb: 100
pelr: 6
- dnn: internet
dns-primary: "10.176.0.11"
mtu: 1460
ue-ip-pool: {{ core.upf.default_upf.ue_ip_pool }}
ue-dnn-qos:
dnn-mbr-downlink: 1000
dnn-mbr-uplink: 1000
bitrate-unit: Mbps
traffic-class:
name: "platinum"
qci: 9
arp: 6
pdb: 300
pelr: 6
site-info: "enterprise"

✅ Userplane Section:
Defined dnn_list with individual DNNs and their respective ue_ip_pool.
cpiface:
dnn_list:
- dnn: "ims"
ue_ip_pool: "172.252.0.0/16"
- dnn: "internet"
ue_ip_pool: "172.250.0.0/16" # Must match slice DNN
hostname: "upf"
enable_ue_ip_alloc: false