Configuration Guide for Cisco NCS 1014, IOS XR Releases 25.x.x

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Configuration Guide for Cisco NCS 1014, IOS XR Releases 25.x.x

Laser squelching

Updated: October 7, 2026

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This section explains how laser squelch mechanisms operate on Ethernet controllers, their benefits in fault handling, and the differences across card types.

You can enable laser squelching on Ethernet controllers. Laser squelching can be enabled on QXP, 1.2T, 2.4T, and 2.4T-X cards which shuts down the laser in the event of trunk faults (LOS, LOF), and a SQUELCHED alarm is raised on the mapped client port.

Laser squelching uses an interrupt based method. Therefore, squelching occurs faster than in previous releases.

Beyond trunk faults, squelching occurs in 1.2T cards, for the client alarms Ingress LF, LOA, and CSF (ingress only).

Configure laser squelching

Enable or disable the laser squelch feature for specific optical cards, enhancing operational control and safety.

Laser squelch disables the laser output on designated ports/faults to prevent unwanted signal transmission during error conditions or maintenance.

Procedure

  1. Configure laser squelching for the desired card type:

    For 1.2T cards, enter controller HundredGigECtrlr Rack/Slot/Instance/Port/Lane laser-squelch command.

    For 2.4T or 2.4TX cards, enter controller HundredGigECtrlr | controller fourHundredGigECtrlr Rack/Slot/Instance/Port/Lane laser-squelch command.

    Example:

    This is a sample where laser squelching is enabled on the Ethernet controller of a 2.4T card and a 2.4TX card.

    
RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#controller fourHundredGigECtrlr 0/1/0/1
RP/0/RP0/CPU0:ios(config-eth-ctrlr)#laser-squelch
RP/0/RP0/CPU0:ios(config-eth-ctrlr)#commit

    This is a sample to view the laser squelch status on the controller of a 2.4T card and a 2.4TX card.

    Example:

    Note

    In case of muxponder configuration on the 2.4T-X card, and if laser squelch is configured on the split port, whenever a fault is received on any one trunk, the corresponding split port will be squelched.

  2. Verify the laser squelch status on the controller of a 2.4T card or a 2.4TX card.

    Example:

    
RP/0/RP0/CPU0:ios#show controllers fourHundredGigEctrlr 0/0/0/4
Fri Nov 17 14:26:43.213 UTC
Operational data for interface FourHundredGigECtrlr0/0/0/4:

State:
    Administrative state: enabled
    Operational state: Up
    LED state: Green On
    Maintenance: Disabled
    AINS Soak: Running
      Total Duration: 0 hour(s) 5 minute(s)
      Remaining Duration: 0 hour(s) 3 minute(s) 34 second(s)
    Laser Squelch: Enabled
    Insert Idle Ingress: Disabled
    Insert Idle Egress: Disabled

Phy:
    Media type: Not known
    Statistics:
        FEC:
            Corrected Codeword Count: 580070472                Valid: False      Start time: 13:12:29 Fri Nov 17 2023
            Uncorrected Codeword Count: 0                      Valid: False      Start time: 13:12:29 Fri Nov 17 2023
        PCS:
            Total BIP errors: 0                                Valid: False      Start time: 13:12:29 Fri Nov 17 2023
            Total frame errors: 0                              Valid: False      Start time: 13:12:29 Fri Nov 17 2023
            Total Bad SH: 0                                    Valid: False      Start time: 13:12:29 Fri Nov 17 2023

Autonegotiation disabled.

Operational values:
    Speed: 400Gbps
    Duplex: Full Duplex
    Flowcontrol: None
    Loopback: None (or external)
    BER monitoring:
        Not supported
    Forward error correction: Standard (Reed-Solomon)
    Holdoff Time: 0ms

Laser squelching is enabled on the specified optical card(s). The system disables laser output in response to faults or based on maintenance needs.