Cisco Routers

The Cisco router families, compared

Most buyers arrive at a used Cisco router looking for a part number, and the part number is usually the last decision rather than the first. Four families cover almost everything in service in a branch or an edge today, and they differ less in what they route than in how they are licensed and how much vendor support horizon is left on them. That is the decision this page exists to help with. Once the family is settled, the model within it is a question of interface count and throughput, and it is a much easier question.

The middle two rows are the ones that carry the real decision, and they are opposites. The Cisco ISR 4000 is a family Cisco has stopped taking orders for and continues to support for years yet, which makes a refurbished unit a rational purchase with a defined end date attached to it. The Catalyst 8000 is a family Cisco still ships, bought on a subscription rather than on a perpetual licence. Those are different purchases with different risks, not better and worse versions of the same one.

Which family fits which site

Start with the circuit. A branch taking a single copper handoff at 1 Gigabit or below is served by any of these families, and the decision falls through to licensing and support horizon. A site taking a 10 Gigabit handoff, or terminating two carriers on different media, narrows quickly: the Cisco Catalyst C8300-1N1S-4T2X presents two 10 Gigabit and four 1 Gigabit interfaces before any module is fitted, and that fixed face is the part that cannot be changed later.

Then ask whether the site is joining a software-defined WAN fabric or running as a standalone branch device. That single question separates the families more cleanly than any throughput figure, because it determines which software model the router is bought under and therefore what the ongoing cost looks like. A standalone branch replacement and a fabric member are different purchases even when they are the same chassis.

Finally, count the modules. An estate that depends on a service module inside the chassis is constrained to the platforms that publish one, and that constraint is structural: it does not move with a subscription tier or a software upgrade. The Cisco ISR 4331 and the larger ISR 4000 models carry a service module slot; the smaller ones and the fixed branch platforms do not.

Lifecycle by family, and what it means for a refurbished buyer

The ISR 4000 is the family with published milestones we have verified against Cisco's own notice. Cisco's last day to order was 7 November 2023 and its last day of support is 30 November 2028, under notice EOL14896. Those dates already appear on each of the five ISR 4000 platform pages, from the entry-level Cisco ISR 4321 upward, and they are the reason the family is worth buying refurbished rather than in spite of it: the hardware is unavailable new and remains vendor-supported for years, and that interval is a window a buyer can plan inside.

The Catalyst 8000 and the ISR 1100 are current-ship platforms and we make no lifecycle claim about either. We have not verified a Cisco end-of-life notice for them, and that is a statement about our verification rather than about Cisco's catalogue. If a purchase turns on a vendor support horizon, ask us and we will tell you what we can evidence.

The practical consequence is that a refurbished ISR 4000 and a refurbished Catalyst 8000 are bought for different reasons. The first is bought because new supply has ended and support has not. The second is bought because identical hardware is available sooner and at a different price than the new channel offers, with our warranty in place of the vendor's.

Licenses and subscriptions across the families

Software licenses and subscriptions are not included unless the listing states otherwise, and an entitlement bought by the original owner belongs to that owner's account rather than to the chassis. This is the single most misunderstood part of buying a used Cisco router, and the disclosure is not the same on every family.

On the Catalyst 8000, Cisco states that the Catalyst 8300 Series Edge Platforms are offered only with a Cisco DNA Software subscription, Enterprise Agreement, and Managed Service Licensing Agreement. Cisco separately documents an autonomous, non-software-defined-WAN mode for that platform and publishes performance figures for it, so the ordering statement should not be read as a claim about what the hardware can do. On the ISR 1100 the disclosure is a different one: Cisco does not publish that sentence for the platform at all, and its licensing appears in the ordering guide as tiered subscriptions rather than as a condition of sale. We do not carry one family's disclosure onto another, because doing so would invent one.

On the ISR 4000, throughput itself is gated by which licence is loaded, which is why those pages publish a default figure and a licensed figure rather than a single number. Tell us which features your deployment depends on before you order, and we will confirm in writing what the specific unit we are shipping carries and what you will need to license separately.

Buying refurbished: condition, testing and warranty

Every router is the part number Cisco shipped. Each unit is tested on receipt, then disassembled, cleaned, inventoried, picked, assembled, configured and tested again before it leaves. Whole systems carry a 2-year Enterasource warranty and ship free by FedEx Ground to the lower 48 states. No Cisco warranty transfers to a second owner and we never suggest otherwise. Modules, blanks, rails, antennas and power supplies are separate line items unless a listing includes them. For the wider catalogue, see Cisco networking.

Common questions

Should I buy an ISR 4000 or a Catalyst 8000?

Buy the ISR 4000 if the site is a like-for-like replacement in an existing branch estate and you want a platform with a published vendor horizon behind it. Buy the Catalyst 8000 if the site is joining a software-defined fabric, needs a 10 Gigabit handoff, or has to sit on hardware the vendor still ships. The deciding factor is usually the software model rather than the chassis, so settle that first.

What actually transfers with a used Cisco router, and what does not?

The hardware and the part number transfer. Software subscriptions, feature licences and vendor entitlements do not, because they belong to the account that bought them rather than to the chassis. That is true across every family on this page. Practically it means a used router should be specified as hardware plus a separate licensing line, and any quote that leaves the second line out is incomplete rather than cheap.

What does a published support horizon mean when Cisco has stopped taking orders?

It means the vendor has closed the order book but continues to support the platform until a stated date. On the ISR 4000 those milestones are 7 November 2023 and 30 November 2028 under notice EOL14896. Between those two dates the hardware cannot be bought new and remains supported in service, which is exactly the window a refurbished purchase is buying into. Plan the replacement against the later date.

How does quoting work when nothing on this page is priced?

Tell us the platform, the interfaces you need, which module bays should be populated and the power supply, and we come back with availability and a price against that exact specification. Several of these families are sourced rather than held in every configuration, so a meaningful answer on lead time arrives with the quote instead of before it. Nothing is committed until you have both numbers in front of you.

What happens if the unit you source differs from the one quoted?

You hear about it before anything ships, not after. If the specific chassis we can source differs in any respect from the one quoted, whether that is a power supply variant, a fitted module or a blank in a bay, we tell you and re-quote so the decision stays yours. We would rather lose an order at quote stage than deliver something that does not match the specification a design was built on.

What condition are your refurbished routers in and how are they tested?

Each unit is tested on receipt, then disassembled, cleaned, inventoried, picked, assembled, configured and tested again before shipping, and the part number matches what Cisco shipped. Whole systems come with an Enterasource warranty, stated in full on each listing, and go out free by FedEx Ground to the lower 48 states. We do not publish a burn-in duration, a pass rate or a certification name that we cannot evidence.