Summary: After new boards are added on an electrical-layer ASON network or a static network is upgraded
to an electrical-layer ASON network, ASON services fail to use OCh trail resources if the board models on
two ends of the OCh trail are different, for example, one end uses old boards or old board models such as
TN54NS2 or TN53NS2(COMP) and the other end uses new board modules such as TN53NS2 (STND).
Consequently, operations such as creating, optimizing, rerouting, and reverting electrical-layer ASON
services and upgrading static services fail.
Product Line: Transport network product line Product Family: WDM products
Product Model: OptiX OSN 6800, Optix OSN 8800 Keywords: ASON network
[Problem Description]
Trigger conditions:
One end of an OCh trail on an electrical-layer ASON network uses old boards or old board models
and the other end uses new board models.
Symptom:
Operations such as creating, optimizing, rerouting, and reverting electrical-layer ASON services
and upgrading static services fail. An OTU_TEL_MM alarm is reported.
Identification method:
The problem occurs if either of the following conditions is met:
An OTU_TEL_MM alarm is reported on the network.
One end of an OCh trail uses old boards or old board models and the other end uses new board models.
You can check the OCh trail configuration as follows:
Export a board list from the U2000 and save it. The following figure shows the export path on the U2000.
Open the WDM trail management window, and search for the OCh trails whose Level is OCh. In the
exported board list, check each OCh trail based on the slot numbers, and determine whether the source
and sink OTU board models at the two ends of the OCh trail are the same. If the models of the source
and sink OTU boards are different, for example, the model at one end is TN54NS2 or TN53NS2 (COMP)
and at the other end is TN53NS2 (STND), the problem is prone to occur.
[Root Cause]
For electrical-layer ASON services, the links with inconsistent configurations at the two ends
(for example,the board model at one end is old and at the other end is new) will be filtered out during
intelligent trail search.
[Impact and Risk]
Creating, optimizing, rerouting, and reverting electrical-layer ASON services fail.
In addition, upgrading static services also fails.
[Measures and Solutions]
Recovery measures:
Apply for a maintenance window.
Record information about all the services on the OCh trail, and switch these services.
(For ASON services, optimize them. For non-ASON services, switch them in SNCP mode.)
Record and then delete the fiber connections of the OTU boards.
Remove the logical boards for the OTU boards.
Change the board models at the two ends of the OCh trail to the same. If both ends support the
STND mode, use the STND mode for the OTU boards at the two ends.
Add fiber connections for the OTU boards.
Switch services back to the OCh trail.
—-End
Workarounds:
Perform checks in advance based on the ASON site deployment checklist if boards need to be
added to an electrical-layer ASON network or a static network needs to be upgraded to an
electrical-layer ASON network.
Perform rectifications for any issues.
Solution:
None
Material handling after replacement:
None
[Rectification Scope and Time Requirements]
Sites where the electrical-layer ASON feature is enabled
[Rectification Instructions]
None
[Attachment]
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