Where to find the model number of a fiber optic switch

You can find the model number of a fiber optic switch by checking the device label, using the management interface, or running CLI commands such as show inventory or show interfaces transceiver on Cisco switches.

Physical Inspection

Most switches have a label on the chassis that lists the model number, serial number, and other identifying information. Look for stickers on the front, back, or bottom of the switch. This is the quickest way to identify the model without accessing the network interface .

Using the Command-Line Interface (CLI)

For Cisco switches, you can retrieve the model number and related hardware details via CLI commands:

• show inventory: Lists all detected hardware, including the switch chassis and installed SFP modules, displaying Product ID (PID), Version ID (VID), and serial numbers .
• show interfaces transceiver detail: Provides detailed information about fiber optic transceivers, including model numbers, vendor, and optical diagnostics .
• show interfaces status: Displays the status of all interfaces, helping you identify which ports are fiber and which transceivers are installed . These commands allow you to confirm the exact model and verify compatibility with SFP modules or other network devices.

Using Online Tools

If you have the serial number but cannot access the switch physically, Cisco provides the Device Serial Checker tool (requires CCO login) at https://cway.cisco.com/sncheck/ to look up the model number . This is useful for bulk inventory checks or when managing multiple devices remotely.

SFP Module Considerations

If your goal is to verify fiber connectivity or transceiver compatibility, understanding the SFP module model is also important. Cisco SFP model numbers encode information about:

• Fiber type (single-mode or multimode)
• Transmission distance (e.g., SR for short reach, LR for long reach)
• Wavelength and connector type
• Environmental specifications or temperature ratings You can cross-reference the switch model with Cisco's transceiver compatibility matrix to ensure proper operation.

Summary

To find the model number of a fiber optic switch:

1. Check the physical label on the switch chassis.
2. Use CLI commands like show inventory or show interfaces transceiver detail.
3. Use Cisco's online Device Serial Checker if you only have the serial number.
4. Verify SFP module compatibility using the model number and Cisco's official documentation. Following these steps ensures accurate identification for maintenance, upgrades, or troubleshooting purposes .