Abstract:
Since the Generic Framing Procedure (GFP) for the N2EFT8/ N2EFT8A board strictly verifies the GFP frames from third-party huawei transmission equipment after the board is connected to third-party , all frames are discarded and services are unavailable.
[Problem Description]
Trigger conditions:
1. The following three conditions are met during deployment:
(1) The NE software is a version earlier than V100R010C03SPC202.
(2) The board uses the GFP encapsulation mode.
(3) The NE is connected to third-party equipment.
2. The following three conditions are met during maintenance:
(1) The board uses the GFP encapsulation mode.
(2) The NE is connected to third-party equipment.
(3) The N1EFT8/N1EFT8A board is replaced with N2EFT8/N2EFT8A board in the version earlier than V100R010C03SPC202.
Fault symptom:
Services are unavailable after the N2EFT8/N2EFT8A board is connected to third-party equipment.
Identification method:
1. The NE software is a version earlier than V100R010C03SPC202.
2. The board uses the GFP encapsulation mode.
3. The NE is connected to third-party equipment.
[Root Cause]
The chip has a defect. The x4140 register value of the N2EFT8/N2EFT8A board is 0xacfb and the corresponding bit5/bit6 is 1. This triggers a consistency check for payload headers as shown in the following figure. If the GFP frames sent from the peer end fail to meet related requirements, they are discarded.
[Impact and Risks]
Services are interrupted when related requirements are met.
[Measures and Solutions]
Recovery measures:
None
Workarounds:
1. Change the encapsulation mode to LAPS.
2. Change the GFP type of third-party equipment to 0x1001 and the HEC check value of the type field to 0x1352.
Solutions:
The hardware triggers the problem, which can be prevented using software. Upgrade the NE version to V100R0010C03SPC202 or a later version.
If the current NE version is V100R008C02SP200, a weak mapping mode can be used. Upgrade the software of the N2EFT8/N2EFT8A board only. for more Huawei products please go check Huawei Transmission supplier
Solution of material handling after replacement:
N/A
[Rectification Scope and Time Requirements]
N/A
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