One site have four NEs(one 7500 and three 1600G), OSN7500 version is V100R008C02SPH202, 1600G version is V1R6C02SPC800, all NE were unmanaged. these both were connected to the common Hub, before getting unmanaged, activity was performed to add a new link in the network. So for this one cable was connected from the old hub to the new one in which the new link was getting configured. After conencting & disconnecting the cable from old hub to new hub, NE s got unmanaged.
1、this in no-GNE, the communication is working from NMS to GNE.
2、the receive and send optical power is normal, and can't find ECC error.
3、send one personl go to the side, U2000 LCT can managed four NEs(one 7500 and three 1600G).
4、Checked the physical connectivity, it was OK.
5、Checked the ECC route creation via command ":cm-get-ecccrc” , found that somebody opened the HWECC CRC verify, This causes NEs get unmanaged.
6、checked the NE operate log, found that somebody enable HWECC CRC verify, project personal mistake input this command to OSN7500, bring on NEs get unmanaged.
7、Close HWECC CRC funcation by command ":cm-set-ecccrc:disable;", NEs get managed on NMS.
1. dcn issue.
2. fiber issue.
3. gscc board issue.
4. NE communication issue.
The ecccrc should be closed on both the sides of interconnecting NEs else NE gets unmanaged.