Cat3k Jun 2026

This report covers the following primary hardware families within the "Cat3k" designation:

But if you need a switch that boots up in 90 seconds, survives a power brownout, and has a CLI that hasn't changed in two decades—the Cat3k-X is your answer.

While the newer Catalyst 9000 series represents the future of the portfolio, legacy Cat3k platforms (such as the 3850 and 3650) are approaching or have reached End of Sale (EOS) and End of Life (EOL). This report recommends a strategic migration path toward the Catalyst 9000 series to ensure continued support, security updates, and network programmability. This report covers the following primary hardware families

"Cat3K" is a common industry shorthand for the . Positioned as a premier stackable enterprise-class access layer switch, it bridged the gap between traditional access switching and advanced core features.

In the rapidly evolving landscape of enterprise networking, the demand for robust, secure, and high-performance access layer switches has never been higher. For years, the —often referred to in the industry as Cat3K —has stood as a cornerstone of modern campus networks. "Cat3K" is a common industry shorthand for the

What made the Cat3k-X a game-changer upon its release? Two things: and StackWise Plus .

The revolutionized access layer switching by blending wired and wireless networking into a single, high-performance stackable unit. Its influence on network architecture, particularly in security and SDN readiness, is still felt today. For years, the —often referred to in the

These switches run Cisco IOS Classic (15.0 to 15.2). For veterans, this is a blessing. No complicated IOS-XE guest shells, no Python scripts required, no mandatory smart licensing headaches (though Smart Licensing was introduced late in the lifecycle).

The Cisco Catalyst 3750-X and 3560-X are not modern switches. They lack mGig, they can't run VXLAN, and they consume twice the power of a modern equivalent.

Coupled with StackWise Plus (40 Gbps backplane), network engineers could suddenly manage an entire closet of 9 switches as a single logical unit. One IP address, one configuration file, zero spanning-tree nightmares.

The switches run on , providing support for APIs, automation tools, and the ability to run containerized applications, making them a precursor to the Catalyst 9000 series. Cat3K vs. Cat2K: Understanding the Difference