Creating an ASON service fails because the wavelength for the service is reserved.
Fault Description
A network uses Huawei's OptiX OSN 6800 devices, for which optical-layer ASON is enabled.
A 10G optical service is planned for the link from SITE_C to SITE_B. According to the network plan, the 10G service is a silver service configured with two associated trails. For the service, SNC/N protection is configured on the client side. The working trail is planned as SITE_C –> SITE_2 –> SITE_B and wavelength 10 is planned for the working trail; the protection trail is planned as SITE_C –> SITE_1 –> SITE_A –> SITE_B and wavelength 50 is planned for the protection trail. When configuring the SNC/N protection, the customer successfully creates the working trail but fails to create the protection trail.
Cause Analysis
A fault diagnosis shows that Resource Reservation is enabled for No. 50 wavelength at SITE_A. After wavelength 50 at SITE_A is no longer reserved, Huawei has successfully created the protection trail.
Troubleshooting Procedure
Use the following steps to diagnose the fault:
- Check for abnormal alarms at the sites on the protection trail. If there are no abnormal alarms, go to the next step.
- Check TE links and ensure that they are up.
- Optimize the service that is successfully created (the service over wavelength 10) to the protection trail. If this operation is successful, go to the next step.
- Check NE-level optical cross-connections of the sites on the protection trail. If no optical cross-connections are configured for No. 50 wavelength, go the next step.
- Check whether the resources (wavelength 50 in this example) of a site on the protection trail, for example, SITE_A, is reserved. If it is reserved, release it.
Conclusion and Suggestion
The initial design for the network, wavelength 50 is planned for carrying a traditional service. To prevent this wavelength being occupied by an ASON service during rerouting, the network designer specifies wavelength 50 at SITE_A as a reserved wavelength. However, the service plan is changed later and wavelength 50 is used to carry an ASON service, but wavelength 50 is not released. As a result, creating the protection trail fails.
For a wavelength that is planned to carry a traditional service, it is recommended that users reserve this wavelength at a site that the service traverses to prevent this wavelength being occupied by an ASON service during rerouting. If the service plan is changed, users must release this wavelength for the FIU board at the site.
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