In last one year we faced fluctuation in DWDM DCN Network and different cause and different solution found;

Friends I am now sharing with you case by case in different posts in this forum.

Case-1: http://support.huawei.com/gsbbs/bbs/9065.html

Case-2: http://support.huawei.com/gsbbs/bbs/9071.html

Case-3: All NE goes offline and after sometimes it comes again online and after fluctuation for almost one hour all NE goes offline parmanently

NE Type: OSN6800

Alarms: NE_NOT_LOGIN alarms in U2000

Analysis: At first NMS design docment analysed. It is found that all GNE(primary & secondary) connection is normal GNE connection mode is revertive. And all NEs are connected to primary GNE; No switching happened.

Findings: After analysis we became sure that no problem in GNE. Then we analysed the U2000 server connectivity; There is two U2000 server; One is primary another is secondary; HA(High Availability) link between primary and secondary was also OK; But between GNE & U2000 server there was L2 switch; Switch ethernet port was not blinking.

Solution: After changing connectivity to different port problem solved.

Thanks for share your experience! It?s a good troubleshooting flow for this cases!

I have red your three DCN fluctuation cases and those are good references for our daily work.