Configuration Guide for Cisco Optical Site Manager, IOS XR Release 26.x.x

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Configuration Guide for Cisco Optical Site Manager, IOS XR Release 26.x.x

Provision trail trace monitoring

Updated: October 14, 2026

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Use this procedure to provision trail trace monitoring. This task helps you complete the required configuration, verification, or management action in Cisco Optical Site Manager.

Provision trail trace monitoring to configure parameters that monitor the integrity and connectivity of optical transport paths. This is done by setting and verifying trail trace identifiers (TTI) on OTU and ODU interfaces.

Trail trace monitoring can be configured at different levels, such as Section (OTU interfaces) and Path (ODU interfaces). You can configure parameters such as transmit and expected trace strings, detection modes, and alarm propagation settings.

Before you begin

Follow these steps to configure the parameters for trail trace monitoring.

Procedure

  1. Click the Provisioning tab.

  2. Click the Trail Trace Monitoring section to expand it.

  3. From the Level drop-down list, select any of these options:

    To

    Select

    List all the OTU interfaces

    Section

    List all the ODU interfaces

    Path

  4. Modify required settings as listed in this table.

    Table 1. Trail Trace Identifier Settings

    Parameter

    Description

    Options

    Port

    Displays the port number.

    This field is not editable.

    Legacy Tx-TTI

    Set the current transmit string of the TTI. This is the string that network transmits at the beginning of a path. It helps the far-end device verify the source and integrity of the connection.

    		 Valid values:

    0-64 bytes

    Legacy Expected-TTI

    Set the TTI value that the network device expects from the far end of the optical path.

    The device continuously compares the Legacy Rx-TTI with this expected value to verify the integrity and correctness of the connection.

    0-64 bytes

    Legacy Rx-TTI

    Displays the trail trace identifier string that your network device receives from the remote (far-end) device over a monitored path.

    This field is not editable.

    Alarm Propagation

    If a discrepancy is detected between the expected and received trace, it raises an alarm. If set to true, the alarm is propagated downstream to the other nodes.

    		 Available options:

    • true

    • false

    Detect Mode

    Enable this mode to allow the system to automatically detect and display the trail trace identifier (TTI) received from the far end of an optical path.

    • When this mode is enabled, the device does not compare the Legacy Rx-TTI to a pre-configured expected value.

    • Instead, it simply captures and shows the actual TTI being received from the remote end.

    		 Available options:

    • Disabled

    • Enabled

    • SAPI

    • DAPI

    • SAPI-and-DAPI

  5. Click Apply.

After provisioning, the system continuously monitors the trail trace identifiers on the specified interfaces. Any mismatch between the expected and received trace strings triggers alarms.