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  • Support for optics local loopback on 400GbE coherent ZR DWDM optics (PTX10004 and PTX10008)—Starting in Junos OS Evolved Release 21.3R1, we support optics local loopback on 400GbE coherent ZR dense wavelength-division multiplexing (DWDM) optics. To enable this feature, use loopback <local> at the [edit interfaces optics-options] hierarchy level. We also support 75 Grid spacing for 400GbE ZR.

    [See optics-options, show interfaces, show interfaces diagnostics optics, and show chassis pic.]

  • Support for performance monitoring and TCA (PTX10004 and PTX10008 with PTX10K-LC1202-36MR)—We now support performance monitoring and threshold-crossing alert (TCA) information for the QSFP56-DD 400GbE ZR optical transceiver modules (shown in CLI output as QSFP56-DD-400GE-ZR). TCAs provide the management system an early indication of the deteriorating health of an optical network connection when the performance parameter that you monitor crosses a certain threshold. You can view the current and historical performance monitoring metrics which are accumulated into 15-minute and 1-day interval bins by using the show interfaces transport pm command. You can thus manage optical transport link efficiently.

    [See show interfaces transport pm.]