Description of the problem

A bureau of Huawei OSN3500 SDH equipment network elements use N2EGS2 to interface with other manufacturers, after service configuration, the single board reported LP_SLM_VC12 alarm, querying the single board received V5 byte 0x05, receivable V5 byte 0x0D, but when trying to modify the receivable V5 byte 0x05, the network management reported that the "V5 overhead is illegal, error code 38809". OSN3500 host version 5.21.16.13P04, N2EGS2 version with the host. The OSN3500 host version is 5.21.16.13P04, and the N2EGS2 version is compatible with the host.

Alarm Message

Huawei OSN3500 SDH equipment network element V5 overhead illegal, error code 38809

Processing

1. On-site attempts to modify the receivable V5 byte to other values all operate normally.

2、After confirming that 0x05 is the reserved byte mode, the equipment has done the restriction not to set the receivable V5 byte to 0x05. In this case, you can only modify the docking veneer receivable V5 byte to other modes first, and then modify the N2EGS2 veneer receivable V5 byte to eliminate the alarm.

Root Cause

There are a total of 13 modes of V5 byte overhead, of which 0x05 is the reserved byte mode and cannot be set.

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