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Interfaces

  • Monitor pre-FEC BER on optical interfaces (QFX5220, QFX5230-64CD, QFX5240-64OD, and QFX5240-64QD)—You can assess raw optical signal quality by measuring the pre–forward error correction (FEC) bit error rate (BER), which reflects errors before correction. Use pre-FEC to evaluate the effectiveness of cable performance and error correction. These metrics help you identify impairments early and guide link tuning or maintenance decisions. You collect both metrics in monitoring workflows to support objective path selection, capacity planning, and service assurance. Use the show interfaces interface-name command to display the pre-FEC BER. [See show interfaces.]

  • FEC histogram and statistics on optical interfaces (QFX5220, QFX5230-64CD, QFX5240-64OD, and QFX5240-64QD)—Use the FEC histogram to evaluate link quality. The histogram shows symbol error corrections per FEC codeword for precise assessment of transmission integrity. Run show interfaces interface-name to display FEC counters, corrected and uncorrected codeword counts, pre-FEC BER, and the FEC histogram. This visibility enables you to detect degradation and guide troubleshooting and optimization. [See show interfaces.]

  • Support for native 800 Gbps and SFP28 10/25 G with expanded channelization options for OSFP and QSFP-DD (QFX5241-64OD and QFX5241-64QD)—Optimize port density and migration by selecting native speeds or channelization on QFX5241-64OD and QFX5241-64QD switches.

    On the QFX5241-64OD, you can configure native 800-Gbps speed on the OSFP ports and 10-Gbps speed on the SFP28 ports. You can also channelize OSFP ports into 2x400 Gbps or 8x100 Gbps.

    On the QFX5241-64QD:

    • Configure the following native speeds on the QSFP-DD ports:

      • 800 Gbps

      • 400 Gbps

      • 100 Gbps

    • Use 10-Gbps speed on the SFP28 ports.

    You can also channelize the QSFP-DD ports into the following speeds:

    • 2x400 Gbps

    • 4x100 Gbps

    • 8x100 Gbps

    • 8x50 Gbps

    Do not mix 8x100 Gbps or 8x50 Gbps on odd and even ports. See Port Speed on QFX Series Switches. Also, Select your product in the Hardware Compatibility Tool to view supported transceivers, optical interfaces, and direct attach copper (DAC) cables for your platform or interface module.

  • Port speed and channelization (QFX5241-32OD)— You can tailor port speeds and channelize interfaces on QFX5241-32OD switches. On the QFX5241-32OD, you can configure native 800-Gbps speed on the OSFP ports and 10-Gbps speed on the SFP28 ports.

    You can also channelize the OSFP ports into the following speeds:

    • 1x800 Gbps

    • 2x400 Gbps

    • 4x200 Gbps

    Even-numbered ports support 8x100G or 8x50G; the next odd-numbered port supports up to 2x. [See Port Speed on QFX Switches.]