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aci-sim/topology.yaml
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taodengandClaude Fable 5 7e9a175ce6 Initial public release — aci-sim v0.16.0 
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>
2026-07-05 20:06:36 +10:00

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# aci-sim — 2-site ACI lab topology
#
# Object names follow a GENERICISED ACI naming convention (derived from a real
# NIP/LLD, with all customer/site-specific tokens stripped):
# region/site codes: LAB0 = stretched (multi-site) LAB1 = site-1 fabric LAB2 = site-2 fabric
# tenant: MS-<pattern> (multi-site/NDO) SF-<pattern> (single-fabric) pattern = TN1 (no-FW)
# vrf: vrf-L3_<region> / vrf-L2_<region>
# bd: bd-BD<n>_<region> (BD3+ = stretched, BD1/BD2 = local, L2 = L2-only)
# ap: app-Stretched_<name>_<region> / app-Local_<name>_<region>
# epg: epg-APP<n>_Stretched_BD / epg-APP<n>_Local_BD
# l3out: l3o-bgp-Core_<region> ext-epg: xepg-All_<region>
# contract: con-<name>_<region> filter: flt-<name>_<region>
# domain: phy-<purpose> / l3d-<purpose> / vmm-vmw-<site> vlan pool: vlp-<purpose> aaep: aep-<purpose>
# switch: <site>-ACI-SP<nn> (spine) / <site>-ACI-LF<node_id> (leaf) / <site>-ACI-APIC<nn> / <site>-ACI-CSW<nn>
#
# APIC LAB1 → 127.0.0.1:8443 (sandbox 10.192.0.11:443, subnet 10.192.0.0/25)
# APIC LAB2 → 127.0.0.1:8444 (sandbox 10.192.128.11:443, subnet 10.192.128.0/25)
# NDO → 127.0.0.1:8445 (sandbox 10.192.0.10:443)
#
# Node-ID scheme (unchanged): LAB1 leaves 101-102 / spines 201-202 / border 103-104;
# LAB2 leaves 301-302 / spines 401-402 / border 303-304.
fabric:
name: LAB-IT-ACI
evpn_rr: spine # spines act as BGP-EVPN route-reflectors; leaves are clients
loopback_pool: "10.0.0.0/16"
oob_pool: "192.168.0.0/16"
ndo_mgmt_ip: "10.192.0.10" # NDO/ND (in LAB1's mgmt subnet)
# ---- Tier-1 fabric params (PR-18) — all optional, shown here at their
# schema defaults (uncomment/edit to override; omitting them entirely is
# equivalent to the values below, so existing files need no changes):
# tep_pool: "10.0.0.0/16" # infra TEP address space (store+validate only; see docs/DESIGN.md PR-18 note)
# infra_vlan: 3967 # fabric infrastructure VLAN, 1-4094 (store+validate only)
# gipo_pool: "225.0.0.0/15" # multicast GIPo pool (store+validate only)
# ---- Tier-3 fine-tuning params (PR-20) — all optional, shown here at
# their schema defaults (uncomment/edit to override; omitting them is
# equivalent to the values below, so existing files need no changes):
# oob_subnet: "192.168.0.0/16" # explicit OOB mgmt subnet (store+validate only; must fall within 192.168.0.0/16)
# inb_subnet: "10.100.0.0/16" # in-band mgmt subnet (store+validate only — no mgmtInB MO built by this sim)
# default_bd_mac: "00:22:BD:F8:19:FF" # fabric-wide default BD gateway MAC -> fvBD.mac (real ACI default)
# default_apic_version: "4.2(7f)" # fabric-wide APIC controller version override; wins over each site's own apic_version
# ---- Single-APIC-per-site by design (PR-21) — see README "Configuration"
# section. APIC cluster size does not affect Ansible playbook deployment
# testing (a playbook targets ONE APIC endpoint); cluster size only matters
# for cluster-health/appliance-vector tooling (e.g. autoACI's health_score.py).
# Each site below omits `controllers`, so it defaults to 1 (single APIC).
# To exercise multi-controller/cluster-health semantics on a site, add:
# controllers: 3 # 1-5, real ACI's min cluster size is 3
# controller_ips: ["10.192.0.11", "10.192.0.12", "10.192.0.13"] # optional; omit to auto-derive sequentially from mgmt_ip
# ---------------------------------------------------------------------------
# Sites
# ---------------------------------------------------------------------------
sites:
- name: LAB1
id: "1"
apic_host: "127.0.0.1:8443"
mgmt_ip: "10.192.0.11" # sandbox: LAB1 APIC (subnet 10.192.0.0/25, served on :443)
fabric_name: "LAB1-IT-ACI" # topSystem.fabricDomain → autoACI site grouping/colour
asn: 65001
pod: 1
# controllers: 1 # APIC cluster size (Tier-1, PR-18; single-APIC default, PR-21); default 1, shown here at its default
# oob_gateway: "10.192.0.1" # OOB mgmt default gateway (OOB-gateway PR); optional, default
# None (omitted) — when set, lands on the real mgmt-tenant MO
# uni/tn-mgmt/mgmtp-default/oob-default/rsooBStNode-[<node-dn>]'s `gw`
# attribute for every node at this site (build/mgmt.py); when unset,
# that same MO still builds, just with an empty `gw` (no gateway
# invented/derived).
spines:
- {id: 201, name: "LAB1-ACI-SP01"}
- {id: 202, name: "LAB1-ACI-SP02"}
leaves:
- {id: 101, name: "LAB1-ACI-LF101"}
- {id: 102, name: "LAB1-ACI-LF102"}
border_leaves:
# Two border leaves sharing vpc_domain form a vPC pair
- id: 103
name: "LAB1-ACI-LF103"
vpc_domain: vpcdom-LAB1
csw:
name: "LAB1-ACI-CSW01"
asn: 65100 # shared enterprise-core AS — BOTH sites' CSW use it (≠ fabric AS 65001/65002)
peer_ip: 10.100.0.1 # CSW IP on the peering sub-interface
local_ip: 10.100.0.2 # LAB1-ACI-LF103's own IP on the same sub-interface
vlan: 100
- id: 104
name: "LAB1-ACI-LF104"
vpc_domain: vpcdom-LAB1
csw:
name: "LAB1-ACI-CSW01"
asn: 65100
peer_ip: 10.100.0.1
local_ip: 10.100.0.3 # LAB1-ACI-LF104's own IP (different from LF103's)
vlan: 100
cabling: auto # auto = full spine×leaf mesh + border-leaf uplinks
- name: LAB2
id: "2"
apic_host: "127.0.0.1:8444"
mgmt_ip: "10.192.128.11" # sandbox: LAB2 APIC (subnet 10.192.128.0/25, served on :443)
fabric_name: "LAB2-IT-ACI" # topSystem.fabricDomain → autoACI site grouping/colour
asn: 65002
pod: 1
spines:
- {id: 401, name: "LAB2-ACI-SP01"}
- {id: 402, name: "LAB2-ACI-SP02"}
leaves:
- {id: 301, name: "LAB2-ACI-LF301"}
- {id: 302, name: "LAB2-ACI-LF302"}
border_leaves:
- id: 303
name: "LAB2-ACI-LF303"
vpc_domain: vpcdom-LAB2
csw:
name: "LAB2-ACI-CSW01"
asn: 65100 # same enterprise-core AS as LAB1's CSW (one external AS, two edge routers)
peer_ip: 10.200.0.1
local_ip: 10.200.0.2
vlan: 200
- id: 304
name: "LAB2-ACI-LF304"
vpc_domain: vpcdom-LAB2
csw:
name: "LAB2-ACI-CSW01"
asn: 65100
peer_ip: 10.200.0.1
local_ip: 10.200.0.3
vlan: 200
cabling: auto
# ---------------------------------------------------------------------------
# Inter-Site Network (ISN)
# ---------------------------------------------------------------------------
isn:
enabled: true
peer_mesh: full # every spine in LAB1 BGP-EVPN peers every spine in LAB2
# ---- Tier-2 ISN params (PR-19) — optional, shown here at their schema
# defaults (uncomment/edit to override; omitting them is equivalent):
# ospf_area: "0.0.0.0" # OSPF area for the spine<->IPN/ISN uplink (ospfIf.area); "0" also accepted
# mtu: 9150 # ISN/IPN inter-site uplink MTU (l1PhysIf.mtu on the dedicated ISN port)
# ---- Tier-3 ISN timer params (PR-20) — optional, shown at their schema
# defaults (real ACI defaults):
# ospf_hello: 10 # OSPF hello timer, seconds -> ospfIf.helloIntvl
# ospf_dead: 40 # OSPF dead timer, seconds -> ospfIf.deadIntvl (must exceed ospf_hello)
# bfd_min_rx: 50 # BFD min-rx timer, ms (store+validate only — no bfdIfP MO built by this sim)
# bfd_min_tx: 50 # BFD min-tx timer, ms (store+validate only)
# bfd_multiplier: 3 # BFD detect multiplier, 1-50 (store+validate only)
# ---------------------------------------------------------------------------
# Tenants
# ---------------------------------------------------------------------------
tenants:
# -------------------------------------------------------------------------
# MS-TN1 — multi-site (stretched, NDO-managed) no-firewall tenant, region LAB0
# -------------------------------------------------------------------------
- name: MS-TN1
stretch: true
sites: [LAB1, LAB2]
vrfs:
- name: vrf-L3_LAB0
bds:
# Application tier: 10.1.1.0/24, stretched L2
- name: bd-BD3_LAB0
vrf: vrf-L3_LAB0
subnets: ["10.1.1.0/24"]
l2stretch: true
# mac: "AA:BB:CC:00:00:01" # Tier-3 (PR-20), optional: per-BD gateway MAC override -> fvBD.mac
# # (default: fabric.default_bd_mac, itself the real ACI default 00:22:BD:F8:19:FF)
# Database tier: 10.1.2.0/24, stretched L2
- name: bd-BD4_LAB0
vrf: vrf-L3_LAB0
subnets: ["10.1.2.0/24"]
l2stretch: true
aps:
- name: app-Stretched_Apps_LAB0
epgs:
- name: epg-APP3_Stretched_BD
bd: bd-BD3_LAB0
contracts:
provide: [con-Web_to_DB_LAB0]
consume: []
- name: epg-APP4_Stretched_BD
bd: bd-BD4_LAB0
contracts:
provide: []
consume: [con-Web_to_DB_LAB0]
contracts:
- name: con-Web_to_DB_LAB0
scope: context
filters:
- name: flt-http_LAB0
entries:
- proto: tcp
from_port: "80"
to_port: "80"
ether_type: ip
- name: flt-https_LAB0
entries:
- proto: tcp
from_port: "443"
to_port: "443"
ether_type: ip
l3outs:
# LAB1's L3Out → LAB1-ACI-CSW01 via border leaves 103 + 104
- name: l3o-bgp-Core_LAB1
vrf: vrf-L3_LAB0
site: LAB1
border_leaves: [103, 104]
csw_peer:
name: "LAB1-ACI-CSW01"
asn: 65100
peer_ip: 10.100.0.1
# keepalive: 60 # Tier-3 (PR-20), optional: eBGP keepalive timer, seconds -> bgpPeerP.keepAliveIntvl (default 60, real ACI default)
# hold: 180 # Tier-3 (PR-20), optional: eBGP hold timer, seconds -> bgpPeerP.holdIntvl (default 180; must exceed keepalive)
ext_epgs:
- name: xepg-All_LAB1
subnets: ["0.0.0.0/0"]
# LAB2's L3Out → LAB2-ACI-CSW01 via border leaves 303 + 304
- name: l3o-bgp-Core_LAB2
vrf: vrf-L3_LAB0
site: LAB2
border_leaves: [303, 304]
csw_peer:
name: "LAB2-ACI-CSW01"
asn: 65100
peer_ip: 10.200.0.1
ext_epgs:
- name: xepg-All_LAB2
subnets: ["0.0.0.0/0"]
# -------------------------------------------------------------------------
# SF-TN1-LAB1 — single-fabric (site-local) no-firewall tenant, LAB1 only
# -------------------------------------------------------------------------
- name: SF-TN1-LAB1
stretch: false
sites: [LAB1]
vrfs:
- name: vrf-L3_LAB1
bds:
- name: bd-BD1_LAB1
vrf: vrf-L3_LAB1
subnets: ["192.168.1.0/24"]
aps:
- name: app-Local_Apps_LAB1
epgs:
- name: epg-APP2_Local_BD
bd: bd-BD1_LAB1
contracts:
provide: []
consume: []
contracts: []
l3outs: []
# -------------------------------------------------------------------------
# SF-TN1-LAB2 — single-fabric (site-local) no-firewall tenant, LAB2 only
# -------------------------------------------------------------------------
- name: SF-TN1-LAB2
stretch: false
sites: [LAB2]
vrfs:
- name: vrf-L3_LAB2
bds:
- name: bd-BD1_LAB2
vrf: vrf-L3_LAB2
subnets: ["192.168.2.0/24"]
aps:
- name: app-Local_Apps_LAB2
epgs:
- name: epg-APP2_Local_BD
bd: bd-BD1_LAB2
contracts:
provide: []
consume: []
contracts: []
l3outs: []
# ---------------------------------------------------------------------------
# Endpoint generation knobs
# ---------------------------------------------------------------------------
endpoints:
per_epg: 3 # endpoints to generate per EPG per site
ip_pool_from_subnet: true # pick IPs sequentially from BD subnets
# ---------------------------------------------------------------------------
# Fault seeds + health defaults
# ---------------------------------------------------------------------------
faults:
seed:
- severity: minor
code: "F0532"
node: 101
descr: "Link flap detected on LAB1-ACI-LF101 eth1/1"
- severity: warning
code: "F0554"
node: 102
descr: "Interface operational speed mismatch on LAB1-ACI-LF102 eth1/3"
health_defaults:
node: 95
tenant: 98
# ---------------------------------------------------------------------------
# Access policy (VLAN pools, physical domains, AAEPs)
# ---------------------------------------------------------------------------
access:
vlan_pools:
- name: vlp-general
from_vlan: 100
to_vlan: 200
phys_domains:
- name: phy-general
l3_domains:
- name: l3d-l3out # bound by l3extRsL3DomAtt in the l3out builder
aaeps:
- name: aep-general
# ---- Tier-2 VMM domains (PR-19) — optional, defaults to an empty list
# (no existing builder/production-chain reads a vmmDomP/vmmCtrlrP object
# today; see docs/DESIGN.md PR-19 section). Uncomment to add a
# vCenter-backed VMM domain:
# vmm_domains:
# - name: vmm-vmw-lab1
# vcenter_ip: "10.50.1.10" # -> vmmCtrlrP.hostOrIp
# vcenter_dvs: "DVS-LAB1" # -> vmmCtrlrP.dvsName
# datacenter: "DC-LAB1" # -> vmmCtrlrP.rootContName
# vlan_pool: vlp-general # must reference an access.vlan_pools[] name above
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