aci-sim is a stateful REST simulator of a 2-site Cisco ACI fabric (per-site APIC + ND/NDO management planes) — for testing ACI automation (Ansible cisco.aci / cisco.mso, aci-py, custom REST clients) and CI gates without real hardware. Highlights: APIC + NDO REST surface served from one in-memory MIT built from a declarative topology.yaml; port mode + sandbox (real per-device IPs on :443) run modes; LLDP/CDP neighbor visibility; NDO->APIC deploy mirror (multi-site templates materialize onto the target sites' APIC stores); real-APIC fvBD default attributes; file-backed state save/restore; an `aci-sim` CLI (validate/show/graph/run/new/init/lldp); and an 888-test suite. History squashed for the public release. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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aci-sim — project notes for Claude
A faithful REST simulator of a 2-site Cisco ACI fabric (per-site APIC + one
NDO/MSO plane), driven entirely by topology.yaml. Python 3.11+, FastAPI +
uvicorn + Pydantic v2, in-memory MIT object store, no external dependencies.
Full architecture/contract detail: README.md, docs/CONTRACT.md (the
authoritative ACI/NDO REST behavior contract), docs/DESIGN.md (module map +
design decisions + phase-by-phase build history).
Two run modes: port mode (scripts/run.sh, shared bind + distinct ports
8443/8444/8445) and sandbox mode (scripts/sandbox-up.sh, one loopback IP
per device on :443, needed for NDO auto-discovery clients that hardcode
port 443). Primary public use case: running Ansible cisco.aci playbooks
against it directly — see examples/ansible/.
Test suite: .venv/bin/python -m pytest -q (888 tests, must stay green).
Lint: ruff check . (non-blocking in CI — pre-existing baseline, see
.github/workflows/ci.yml).
Version lives in pyproject.toml; changes are logged in CHANGELOG.md
(newest entry at the top, Keep a Changelog format). The ACI/NDO object
catalog is documented in docs/CONTRACT.md §6; environment variables in
README.md §6.