Configuration Guide for Cisco NCS 1014, IOS XR Releases 26.x.x

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Configuration Guide for Cisco NCS 1014, IOS XR Releases 26.x.x

Frequency

Updated: June 18, 2026

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Use this procedure to configure the frequency on trunk ports of transponder line cards to ensure compatibility and optimal performance.

Use this task to configure the frequency on trunk ports of the transponder line cards.

This table lists the frequency range with grid spacing supported on the line card.

Line card

Frequency range (THz)

Grid spacing

1.2T

191.25 to 196.1

50GHz and 100MHz

1.2TL

1

186.1 to 190.85

100MHz

2.4T

191.25 to 196.1

50GHz and 100MHz

2.4TX using C band trunk pluggables

191.25 to 196.1

50GHz and 100MHz

2.4TX using L band trunk pluggables

186.15 to 190.925

100MHz

QXP

191.275 to 196.125

50GHz and 100MHz
1 Only non-ITU channels are supported

Procedure

1.

Run the controller opticsRack/Slot/Instance/Portdwdm-carrier {100MHz-grid frequency frequency} | {50GHz-grid [frequency frequency} command to configure the wavelength.
2.

Run the commit command to apply the changes.

Change the trunk port frequency on a transponder card

Use this task when you need to modify the optical signal frequency on the trunk port on the transponder cards.

Procedure

1.

Run the config command to enter the global configuration mode.
2.

Run the shutdown command in optics configuration mode to shutdown the trunk port.

Example:


RP/0/RP0/CPU0:ios(config)#controller optics 0/2/0/0
RP/0/RP0/CPU0:ios(config-Optics)#shutdown 
RP/0/RP0/CPU0:ios(config-Optics)#commit 
Fri Jul 11 07:19:30.624 UTC
RP/0/RP0/CPU0:ios(config-Optics)#
The interface at trunk port 0 is shut down.
3.

Run the dwdm-carrier 100MHz-grid frequency <frequency> command to set the new frequency.

Example:


RP/0/RP0/CPU0:ios(config-Optics)#dwdm-carrier 100MHz-grid frequency 1911500
Fri Jul 11 07:20:17.234 UTC
WARNING! Changing channel/wavelength/frequency can impact traffic
RP/0/RP0/CPU0:ios(config-Optics)#commit 
Fri Jul 11 07:20:19.905 UTC
RP/0/RP0/CPU0:ios(config-Optics)#
Note

Changing the trunk port frequency can impact traffic.

The frequency for the 100 MHz grid channel is set to 1911500.
4.

Run the no shutdown command in optics configuration mode to bring the port back up.

Example:


RP/0/RP0/CPU0:ios(config-Optics)#no shutdown 
RP/0/RP0/CPU0:ios(config-Optics)#commit      
Fri Jul 11 07:20:57.198 UTC
RP/0/RP0/CPU0:ios(config-Optics)#
Note

If you configure the frequency and use the no shutdown command in the same batch, the no shutdown command is processed first, followed by the new frequency. This means the trunk interface transmits at the previous frequency for a shorter time.

The channel resumes operation at the new frequency. The channel on the trunk port now operates at the configured frequency.