# Configuration model

Understand how identity, subscribers, policy, topology, and NF replacement are modeled.

Product: 5G Core

Human documentation: https://www.1sc.dev/docs/core/configuration-model

Documentation index: https://www.1sc.dev/llms.txt

## Configuration layers

| Layer | What it controls |
| --- | --- |
| Network identity | PLMN, TAC, and slice identity used by the lab profile. |
| Subscribers | SUPI, authentication material, UE pools, DNNs, and allowed sessions. |
| Policy | Default slice, DNN rule, PDU session type, 5QI, AMBR, and selected SMF/UPF. |
| NF endpoints | Service bind addresses and SBI peers. |
| User plane | N3 bind settings, UE subnet, DNN filter, MTU, and optional data-network fields. |

## Composition

A composition declares which network functions are active and which endpoints each function should call. This keeps the beginner baseline small while leaving room for advanced profiles that replace or omit specific functions.

External NF replacement is a contract boundary. A replacement must expose the required service behavior; endpoint wiring alone is not a conformance guarantee.

## Secrets

> **Do not share keys:** Subscriber keys, OPc values, private keys, generated certificates, packet captures, and raw subscriber payloads can contain sensitive material. Redact them before sending logs or reports.