Will 3rd-party transceivers work in a Cisco Catalyst switch?

Cisco IOS by default rejects unbranded transceivers via EEPROM validation. Two options: (1) Use Cisco-coded 3rd-party modules (FS.com, ProLabs, Approved Optics with Cisco firmware) — these identify as Cisco and work transparently; or (2) Use unbranded modules with the service unsupported-transceiver and no errdisable detect cause gbic-invalid global config commands. Both approaches save 70-95% vs Cisco MSRP with identical optical performance.

What's the difference between Catalyst 3850 and Catalyst 9300?

Catalyst 9300 is the modern Catalyst access/distribution platform, replacing the 3850 line. Key differences: 9300 supports IOS XE 16.x+ (vs 3850's IOS XE 3.x), StackWise-480 (vs StackWise-160), and Cisco DNA Center integration. 9300 is current-gen; 3850 is end-of-sale (Oct 2022) but still widely deployed.

Do refurbished Catalyst switches need new licenses?

Depends. Modern Catalyst 9200/9300/9500 use Smart Licensing — a license is associated with the chassis serial number and stays with the device. Pro Disk Network supplies cleared switches with documentation on how to register the existing license to your Smart Account, or transfer it. Legacy switches (Catalyst 2960, 3850) use Right-to-Use (RTU) licensing that's chassis-locked but doesn't require account registration.

Can I stack different Catalyst models together?

Only within the same series. Catalyst 9300s can stack with each other; Catalyst 3850s can stack with each other; but a 9300 cannot stack with a 3850. Check the stacking module compatibility (StackWise-160 vs StackWise-480 vs StackWise-1T) for your specific models.

How do I configure a Catalyst switch out of the box?

(1) Console connection at 9600 baud, 8N1, no flow control. (2) From CLI, enter privileged mode (enable). (3) Configure terminal, hostname, IP address, default-gateway. (4) Set passwords (enable secret, line console password). (5) Save config to startup (copy running-config startup-config). For zero-touch deployment in modern Catalyst 9000 series, use PnP (Plug and Play) with DNA Center.

Cisco Catalyst Networking Hub: 2960, 3850, 9200, 9300, 9500

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