Hello, everyone!
Today, I'd like to share a case with you.
Problem Description
A site have three subrack to be installed, when engineer connected to the equipment by ethernet cable one by one to modify ID, found that have a OSN 1800 cannot log in. Check SCC board run normal, STAT, PROG, SRV display often green.
Problem Analysis
1, The other 2 subracks can login, exchange SCC board between normal one and problem subrack, the one can't login before still can't login. Therefore, it is doubted that it is the master-slave mode problem.
2, The engineer login 2 normal subracks one by one, use :cfg-get-shelfid command to query whether two subracks are in master-slave mode, return result are as follows:
The first one, return the result:
:cfg-get-shelfid
PHY-SHELF ID SHELF-ID BARCODE
0 2102113354P0F3000369
Total records:1
Second normal one, return result:
:cfg-get-shelfid
PHY-SHELF ID SHELF-ID BARCODE
255 2102113354P0F3000378
Total records:1
SHELF-ID for 255 is stand alone subrack,SHELF-ID 0 is master subrack which is under the master - slave subrack mode, so the first one is in master - slave subrack mode and SHELF-ID is 0.
3. Connect ETH2 port of the first normal subrack to the one which can't be login. Enter the following commands:
:cfg-add-shelf:1,2U
:cfg-add-shelf:2,2U
:cfg-add-shelf:3,2U
:cfg-add-shelf:4,2U
:cfg-add-shelf:5,2U
:cfg-add-shelf:6,2U
Because do not know the SHELF-ID of problem subrack, manually add all possible ID(Note: OptiX OSN 1800support 6 slave subracks at maximum).
4, and use:cfg-get-shelfid query. The returned result is as follows:
:cfg-get-shelfid
PHY-SHELF ID SHELF-ID BARCODE
0 2102113354P0F3000369
1 2102113354P0F3000332
Total records:2
From the above returned result, the problem subrack is also in master - slave subrack mode, and SHELF-ID is 1.
5, These all 3 subracks need to be set as stand alone subracks, So the first a normal one and problem subrack are need to be set as stand alone subracks, can use cfg-set-shelfid commands, the command format is:cfg-set-shelfid:BarCode,OldShelfID,NewShelfID. Run the following command (need set slave subrack first, because this command will lead to subrack automatically resets).
:cfg-set-shelfid:"2102113354P0F3000332",1,255
:cfg-set-shelfid:"2102113354P0F3000369",0,255
6, After the settings are complete, all the problem resolved.
Root Cause
1, Problem subrack is set as slave subrack, it cannot be login when conencted it to PC direcctly.
2, Master-slve subrack attribute is saved on back plane, so replace SCC can't solve this issue.
Solution Description
Change as independent subrack
Suggestion
Set according to design requirement as independent subrack.
Thank you!
