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docs: README positioning note — management-plane simulator, state materialized not computed (v0.20.1)

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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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2026-07-07 12:46:31 +10:00
co-authored by Claude Fable 5
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@@ -21,6 +21,17 @@ entire fabric — nodes, tenants, VRFs/BDs/EPGs, contracts, L3Outs, faults,
endpoints, and the whole NDO schema tree — is generated deterministically
from a single `topology.yaml`.
> **What it simulates (and what it doesn't):** aci-sim simulates the
> **management plane** — the REST API and the operational state a converged
> fabric would report. It does **not** run routing protocols: OSPF/BGP/LLDP
> state (`operSt=full`, `established`, adjacencies, /31 link addressing) is
> **materialized from configuration, not computed** — push the config and the
> matching operational MOs appear, exactly as your automation would read them
> off a healthy fabric. That's why the cisco.aci/cisco.mso collections and
> API clients work unmodified, and why the whole thing runs on a Raspberry
> Pi 4 — and also why it can't test convergence, failover timing, or actual
> traffic forwarding.
![aci-sim topology](docs/images/topology.png)
*A 2-site, 15-node fabric rendered by `aci-sim graph` — spines (blue),