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How To Configure Switch Interface FEC Mode

Time: 2023-07-11
        FEC (Forward Error Correction) is an error correction mechanism that improves signal quality and reduces BER (Bit Error Rate).
        It adds error-correction bits to data packets at the transmit end, which the receive end uses to correct bit errors during transmission.
This function introduces slight signal latency, so you can enable or disable it based on actual network requirements.
        FEC is widely used in high-speed optical module communications such as 25G and 100G.
        This document uses a Moduletek SFP-10/25G-CSR optical module connected to a Cisco C9300 switch as an example to explain how to configure interface FEC mode.
1. FEC Mode Configuration
        Enter interface configuration mode and run the following command to view supported FEC options:
            fec ?
        Available FEC modes vary by switch model. Configure the required FEC mode according to your network plan.
2. View Interface FEC Mode
        Run the following command to check the current FEC configuration of the interface:
            show interface <interface-type> <interface-number>
        The output will display the FEC mode currently in use.
        Important Notes:
            1. Different switch models and module types use different default FEC modes.
            2. FEC participates in link auto-negotiation.
                FEC must be enabled or disabled on both ends of the link, and the FEC mode must be identical at both sides; otherwise, the interface will not go Up.
        Moduletek provides high-speed optical modules supporting various FEC modes. Welcome to purchase!
        For further inquiries about the above content, please contact us at: sales@moduletek.com
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