Checking optical power of Juniper switches

Use the command show interfaces diagnostics optics to view TX/RX optical power and other transceiver diagnostics on Juniper switches.Command OverviewTo check the optical power of transceivers installe...

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Checking optical power of Juniper switches

Use the command show interfaces diagnostics optics to view TX/RX optical power and other transceiver diagnostics on Juniper switches.Command OverviewTo check the optical power of transceivers installed in Juniper EX or QFX series switches, execute:CodeCopyshow interfaces diagnostics optics This command displays Digital Optical Monitoring (DOM) information, including:Transmit (TX) power in mW and dBmReceive (RX) power in mW and dBmLaser bias current (mA)Transceiver temperature (°C/°F)Voltage and TEC currentAlarm and warning flags for each parameter Interface-Specific UsageFor Gigabit or 10-Gigabit Ethernet interfaces:CodeCopyshow interfaces diagnostics optics ge-0/0/0show interfaces diagnostics optics xe-0/0/0 For 40G or 100G interfaces, include the PIC and channel if applicable:CodeCopyshow interfaces diagnostics optics et-fpc/pic/portshow interfaces diagnostics optics et-fpc/pic/port:channel The output will show TX/RX power for each channel, along with alarms if values exceed vendor-defined thresholds .Interpreting the OutputTX Power: Laser output power; ensures the signal is strong enough for the link.RX Power: Received optical power; indicates if the signal is within the acceptable range.Alarms/Warnings: High or low alarms indicate the transceiver may not be operating properly, while warnings indicate values outside normal limits but not necessarily causing immediate failure . Typical TX/RX optical power ranges depend on the transceiver type (e.g., 10G, 40G, 100G) and vendor specifications .Additional TipsTo check the PIC media type and status, use:CodeCopyshow chassis fpc pic-status fpc-slot If the measured power shows 0.000 mW / -Inf dBm, the optics may not be transmitting or receiving properly .Filtering output for alarms or specific channels can be done using showmatch or regular expressions for easier troubleshooting . Using this command regularly helps monitor link health, troubleshoot optical issues, and verify that transceivers operate within optimal power ranges.
Checking Optical Power Juniper

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Output Fields Table 1 lists the output fields for the show interfaces diagnostics optics command. Output fields are listed in the approximate order in which they appear. Transceivers generate monitoring

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EDIT: thanks to comments section for additional commands with no regex needed match db | except th match “power “ (double spaces after power) ORIGINAL show interface diagnostic optic et-0/0/20 |

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Favorite show|match commands for light levels : r/Juniper

Guessing you would need regex for that. You can do a show interfaces diagnostics optics * and add physical or et- with quotes on the match. Laser output power : 0.795 mW / -1.00 dBm. Laser receiver

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