Using the MODIFY DR command, you can move a PU (and its LUs) from one line to another line, delete a PU (and its LUs) from a line, or delete an LU from a PU. Figure 2 shows how to delete PUs and LUs using the MODIFY DR command. Figure 3 shows how to move a PU and its LUs using the MODIFY DR command. You can change the SDLC address for a PU by requesting a move in which the new line and old line are the same, but the address is different.

The NCP to be reconfigured must be active, and the resource to be deleted or moved must be inactive.

Dynamic reconfiguration with the MODIFY DR command should be used only as a temporary method; a new NCP must be generated to reflect the changes as soon as possible. The NCP must be reloaded to reflect the permanent changes.

Dynamic reconfiguration changes made by MODIFY DR are not recorded in NODELST. Therefore, they are not automatically applied and can cause errors because they are not used during a warm start.