Problem description

In the process of XX project factory inspection, according to the customer's business requirements, configure SNCP service, in the process of testing service reversal,

One end is connected to the equipment with SDH analyzer, and one end is looped back on the PQ1 single board by the network management, unplugging the main fiber,

A service interruption is found.

1. the form of networking, ring networking, in which OSN2500 10 units, OSN3500 three units.

2. service configuration, SNCP, recovery type.

3. test instrument SDH analyzer. Rate 2M, coding form HDB3.

Alarm messages

Checking the site where the inversion was unsuccessful, an AU-LOP alarm was found.

Processing

The processing is as follows:

1. Re-examine the service and configure it according to the product manual. the service configuration is fine and the service configuration error fault is ruled out.

2. Recheck the settings of SDH analyzer, according to the guidance of SDH analyzer, the configuration of SDH analyzer is correct,

SDH analyzer send and receive both ends are configured 2M rate, HDB3 coding form. Troubleshoot the configuration of SDH analyzer

error fault.

3. Use the pigtail fiber to change back to the single board with the alarm, the alarm disappeared, to rule out the single board failure.

4. Look at the version configuration of the whole network, and find that the two main control boards of the faulty site, the main main control board is the version of V1R10, and , the backup main control board is the version of V1R8.

The backup main control board is the version of V1R8, the version of the two main control boards is inconsistent, in the V1R10 version of the main control board as

When the V1R10 version of the main control board is used as the main control board, there is an AU-LOP alarm, and it is forced to switch to the V1R8 version of the main control board as the main control board.

The AU-LOP alarm disappeared and the SNCP switchover was successful. When the AU-LOP alarm disappears, carry out the inversion test.

The SNCP switchover test is successful. The reversal time is within 50ms.

Root Cause

Analyze the reasons for unsuccessful service reversal test as follows:

1. SNCP service configuration error.

2.SDH analyzer setup error.

3. Single board failure.

4. Mismatch of network element single board version , the high level cross capacity of V1R10 is 40G, and the main control board of V1R8 is 20G .

cross capacity is not consistent. When V1R10 's main control board is used as the main control board, and V1R8 's main control board is used as the spare main control board.

is used as a spare motherboard, the V1R8 version of the motherboard has a lower crossover capacity than the V1R10 version of the motherboard, and when the crossover capacity of the V1R10 version of the motherboard is higher than the V1R10 version of the motherboard, the

When the cross-capacity is large, the SNCP inversion will be unsuccessful, and when the V1R8 motherboard is used as the main

This will not happen when using the V1R8 as the main control board.

Suggestions and summaries

Suggestions and summaries:

1. In the process of opening the board, make sure that the shipped version should match. Before testing, check the version of the whole network

information is consistent. Before testing, it is important to guarantee that the information is consistent across the network.

END