Change the speed of the gigabit optical module to 100 megabit
You cannot simply slow down a standard 1 Gbps SFP; you need a 100 Mbps-capable SFP module such as Cisco GLC-GE-100FX to operate at 100 Mbps on a Gigabit port.
Hardware Requirements
Standard Gigabit SFPs (1000BASE-SX/LX) are fixed at 1 Gbps and cannot be configured to 100 Mbps . To connect a Gigabit port to a 100 Mbps fiber link, you need a 100BASE-FX SFP module like the Cisco GLC-GE-100FX. This module presents a 1.25 Gbps SGMII signal to the host port while converting it to a 100 Mbps optical signal on the fiber side . It allows the host port to report a 100 Mbps full-duplex link without renegotiating the line speed.
Configuration Steps
- Install the 100 Mbps SFP module in the Gigabit SFP cage.
- Verify platform support: Check the switch or router compatibility matrix to ensure the chassis, line card, and software version support the GLC-GE-100FX .
- Configure the port speed if needed: On some switches, you may need to set the port to 100 Mbps or auto-negotiation using commands like
set port speed 100for Fast Ethernet interfaces . Note that not all Gigabit modules allow manual speed changes; the SFP module itself determines the optical speed. - Check link status: After installation and configuration, the host port should show a 100 Mbps full-duplex link.
Important Considerations
- Some SFPs are single-speed only; a 1 Gbps-only SFP cannot be slowed down .
- The optical interface must match the fiber type and wavelength (e.g., 1310 nm multimode for 100BASE-FX) to ensure proper connectivity .
- Digital Optical Monitoring (DOM/DDM) may be available for live link telemetry on supported modules .
- If the switch does not recognize the 100 Mbps module, verify that the software version and platform support the module. Using a 100 Mbps-capable SFP is the only practical way to connect a legacy 100 Mbps fiber link to a modern Gigabit SFP port without replacing the entire switch or upgrading the remote site to Gigabit.
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