Method used to set Shelf Link Mode

Before connecting a subrack, you need to set Shelf Link Mode to be consistent with the actual physical cascading mode the subracks on the U2000 to ensure proper functioning of the subracks and normal communication between subracks on an NE.
The procedure is as follows:
In the NE Explorer, select the NE and choose Configuration > Shelf Link Management. In the right pane, click the Shelf Link Mode.
Double-click the desired NE, and set it to Tree or Ring according to the actual physical cascading mode of the subracks.
Click Apply.

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