Aironet 1815i (AIR-AP1815I-B-K9) Refresh to Catalyst 9105AX

The Cisco Aironet 1815i (AIR-AP1815I-B-K9) was the workhorse entry-level indoor access point for a generation of branch offices, guest rooms, classrooms, and clinic exam rooms — a compact 802.11ac Wave 2 AP with a single Gigabit uplink that did exactly one job well: cover a small, low-density space without a big budget. That product has now reached the end of its lifecycle, and if you still have 1815i units in production, the clock is running toward a hard cutoff on April 30, 2027.

This guide covers what the end-of-life milestones actually mean for an AIR-AP1815I-B-K9 estate, why the Catalyst 9105AX is the right successor for this specific AP class, and a concrete plan to migrate without disrupting users. For the full milestone record and bulletin reference, see the AIR-AP1815I-B-K9 EoL detail page.

The end-of-life situation for the 1815i — and why now

Cisco published the Aironet 1815 series end-of-life notice with three dates that matter. End of Sale was May 1, 2022, so the 1815i can no longer be ordered new from Cisco. End of Software Maintenance was May 1, 2023 — and this is the one most teams underestimate. Since that date, the platform receives no new maintenance releases and no routine bug fixes. The Last Day of Support (LDoS) is April 30, 2027.

The software-maintenance milestone is the security problem. When a new wireless or IOS-level vulnerability is disclosed, Cisco PSIRT prioritizes fixes for supported trains. A platform past End of Software Maintenance generally does not get a patched image, even for a high-severity advisory. That means every 1815i you run today is, by definition, a device that will not be remediated when the next relevant CVE lands. For auditors, that is a finding — an unsupported, unpatchable device on the network is a control gap under FedRAMP, CMMC, HIPAA, and most enterprise security baselines, regardless of whether anyone has attacked it yet.

Acting ahead of the deadline is not just compliance hygiene. A coordinated refresh lets you buy at planned-procurement prices, schedule installs during maintenance windows instead of emergencies, and avoid the scramble that hits every organization clustered against an LDoS date. Browse the broader list of affected platforms on the Cisco end-of-life hub if you have a mixed fleet.

The replacement: Catalyst 9105AX (C9105AXI-B)

Cisco directs 1815i migration to the Catalyst 9105AX series, and the indoor C9105AXI-B is the direct successor for the AIR-AP1815I-B-K9. It is deliberately matched in role: a small, low-profile entry-level indoor AP built for the same low-to-medium-density spaces. Crucially, it keeps the same 2x2:2 spatial-stream design and the same single Gigabit Ethernet uplink as the 1815i, and it runs on standard 802.3af PoE — so the cabling and switch port that fed your 1815i feed the 9105AX with no power-budget change. This is one of the lowest-friction refreshes in the Cisco wireless portfolio.

What you actually gain

• Wi-Fi 6 (802.11ax) radios replacing 802.11ac Wave 2 — the headline upgrade. OFDMA divides each channel into resource units so the AP serves many small frames (phones, tablets, IoT, VoIP) concurrently instead of one at a time, which is exactly the load profile of a busy room.
• Uplink and downlink MU-MIMO plus BSS Coloring, which raise real-world throughput and cut co-channel interference in dense floors where 1815i units used to choke.
• Target Wake Time (TWT) — battery-powered IoT and medical telemetry devices sleep longer and last meaningfully longer between charges, a tangible benefit in healthcare and warehouse settings.
• Integrated Bluetooth Low Energy / IoT radio for location services and BLE asset tracking without a separate sensor.
• Management on the modern IOS XE Catalyst 9800 controller stack (appliance, 9800-CL virtual, embedded EWC on the AP, or cloud via Catalyst Center / Meraki), with the analytics, assurance, and PSIRT-supported software train the 1815i can no longer receive.

The honest caveat: because the 9105AX keeps the 2x2:2 / 1 GbE profile, raw peak per-client throughput is similar in class — this is not a jump to multigigabit. The win is efficiency and capacity under many clients, security currency, and supportability, not a single-laptop speed-test number. If a given space has genuinely outgrown an entry-level AP, that is the moment to step up to a 4x4 model like the 9120AX rather than a like-for-like 9105AX. You can compare options on the catalog.

A practical migration plan

1. Assess and inventory

Pull a full inventory of 1815i units by site, controller, and AP group. Note which sites run AireOS controllers (5508/8540/3504) versus IOS XE Catalyst 9800 — that single fact determines the size of your project, because the 9105AX is IOS XE only and will not join an AireOS controller. Capture per-AP context: PoE source switch and port, VLAN/SSID mapping, RF profile, and any FlexConnect/branch configuration.

2. Plan the controller and license transition

If you are still on AireOS, the controller migration to Catalyst 9800 (physical, 9800-CL, or embedded EWC for small branches) is the real work; the AP swap is the easy part that follows. In parallel, move licensing to Cisco DNA / Smart Licensing using Policy: stand up or confirm your Smart Account, then size DNA Essentials or Advantage term subscriptions to AP count. Order these before hardware so entitlement is ready at cutover.

3. Config and feature parity

Rebuild WLAN profiles, policy profiles, RF profiles, and security (802.1X/PSK, WPA3 where you can now adopt it) on the 9800. Validate that any 1815i FlexConnect behavior maps to the equivalent 9800 site-tag/flex-profile model. Wi-Fi 6 also lets you enable WPA3 and Enhanced Open — worth folding into the parity pass rather than carrying old WPA2-only configs forward.

4. Physical install

Physically the swap is straightforward: same single GbE uplink, standard 802.3af PoE from the existing switch port, similar mount footprint. Confirm the existing mounting bracket fits or order the 9105AX bracket. No optics, no stacking, no power-budget recalculation — verify each switch port still supplies clean 802.3af and reuse the run.

5. Phased cutover and secure decommission

Pilot one representative site, validate roaming, capacity, and client onboarding, then roll site by site during maintenance windows. As each 1815i comes down, wipe its configuration, remove it from the controller and any RADIUS/NAC trust, and dispose of it through a documented, asset-tracked process — important for federal and healthcare chain-of-custody. Do not let retired APs sit on a shelf still trusted by the network.

Procurement notes for government and enterprise

For federal, DoD, and SLED buyers, order the TAA-compliant C9105AXI-B (the -B regulatory domain is the US/Americas SKU) through an authorized Cisco partner so the unit ships with valid Cisco entitlement and TAA documentation for FAR/DFARS. Micro-purchase GPC orders are simple; larger refreshes flow through your contract vehicle. Build in time for Smart Account provisioning and subscription activation, and order ahead of the 2027 LDoS window rather than against it — a planned refresh always costs less and breaks less than an emergency one.

Ready to scope your 1815i replacement? Request a refresh quote and we'll size the Catalyst 9105AX units, DNA subscriptions, and controller path to your exact site list — with TAA-compliant sourcing and current lead times.