Problem Description

A bureau OSN2500 equipment N2EGS2 single-board second port, and industry soft switch pairs to open the Ethernet service, the switch port reported LINK_DOWN alarm can not UP, transmission without any span>, and the transmission does not have any alarms.

Alarm information

None, the switch port reports the LINK_DOWN alarm.

Processing

1, on-site testing through the test frames to test the service configuration is not a problem;

No. p class="MsoNormal"> 2、交换机和传输对接端口工作模式设置一致故障依旧；

3、更换交换机端口故障依旧，调整业务到另一块< N2EGS2 single board failure to solve the problem, suspected transmission board failure, but the first port of the single board business is normal;

4, through the manufacture of the information to view the two optical ports of the manufacture of information does not match the port of the failure of the optical module manufacturing information can not be displayed, remove the optical module manufacture 信息不能显示，拔下光模块查看型号为多模多速率光口，重新更换与交换机一致波长和速率的光模块后，进行测试，交换机端口LINK_UP业务正常。

Root cause

On-site inspection of the transmission side and the switch side of the input and output optical power is normal, the transmission side of the absence of any alarm, the probable reasons are as follows:

1, transmission service configuration error Ethernet service is not available;

2, the docking port working mode is not the same; <

3, N2EGS2 single board or switch port failure;

4, docking optical port operating wavelength and rate inconsistency;

Solution

Recommendations and Summary

Nowadays Most Ethernet veneer boards use pluggable optical modules, and you need to pay attention to whether the optical module model is consistent with the docking device when you open the board.