C9400-DNA-E-3R

C9400-DNA-E-3R is a Cisco DNA Essentials software subscription for the Catalyst 9400, on a 3-year term sold as a renewal. The Catalyst 9400 is a modular chassis switch for campus access and smaller aggregation.

How Catalyst 9000 licensing actually works. There are two layers and they are bought separately. The switch ships with a perpetual Network licence — Network Essentials or Network Advantage — which never expires and is what keeps the switch forwarding traffic. On top of that sits the DNA subscription, which is what this part number is. The subscription entitles the Catalyst Center features: automation, assurance and analytics across the estate. Cisco requires an add-on subscription to be ordered with a new switch, which is why these part numbers turn up on quotes even when the buyer only wanted hardware.

The rule that catches people out: the subscription tier has to match the perpetual Network tier. DNA Essentials pairs with Network Essentials, DNA Advantage with Network Advantage. Ordering DNA Essentials for a switch licensed at the other tier is one of the commonest reasons a Catalyst order has to be redone, so it is the first thing we check.

What Essentials covers. It is the foundational tier: device and software management, configuration templates and automated provisioning, network telemetry and health monitoring, and the baseline assurance that tells you what is actually happening on the network rather than what you assumed. For an estate where the goal is centralised visibility and faster, less error-prone provisioning, Essentials is usually enough.

This is a renewal part number, and that limits what it can be used for. Cisco’s current ordering guides list the DNA subscriptions as three-, five- and seven-year terms; the renewal forms are not documented there, and the trade treats them as orderable only against a subscription that already exists. If you are licensing a switch for the first time you need the standard term part number instead. If you are extending an existing subscription, tell us the Smart Account it sits in and we will confirm this part can be applied to it before you order — that check is quick and it avoids a credit note.

How it is delivered. These are Smart Licences, not a PAK or a paper certificate. The entitlement lands in a Cisco Smart Account and is managed through Cisco Smart Software Manager, so you need a Smart Account before the licence is of any use — if you do not have one we will tell you rather than let it become a surprise. One genuinely useful property: Smart Licences can be moved between devices of the same type, so a switch replacement does not mean rebuying the subscription.

A caveat on the hardware. The Catalyst 9400 Supervisor-1, 1XL and 1XL-Y modules went end-of-sale on 30 April 2025, replaced by the Supervisor-2 and 2XL. The chassis and the newer supervisors are still current and so is this licence, but if your 9400 is running a Supervisor-1 it is worth knowing where that sits before you commit to a multi-year subscription on it.

One thing worth knowing about where this is heading. Cisco has introduced a unified Networking Subscription, with Essentials and Advantage tiers spanning switching, wireless and WAN and a 36-month minimum on a new subscription. It runs alongside the DNA part numbers rather than replacing them — as of Cisco’s ordering guides this autumn, DNA, Catalyst and Networking Subscription part numbers are all still orderable. The unified licences do require a recent IOS XE release, so if you are considering that route the software version on your switches decides whether it is available to you yet.

Green Code Technologies supplies Cisco switching, wireless and the licensing that goes with it. Tell us the switch model, its current Network licence tier and the port count, and we will confirm this is the right part number before you order.