You can use dynamic reconfiguration to logically move physical and logical units to an alternate line. The task is about steps to define dynamic reconfiguration with both LPDA-1 modems and LPDA-2 DCEs.

To define dynamic reconfiguration with both LPDA-1 modems and LPDA-2 DCEs, perform the following steps.

1. Generate the NCP to include dynamic reconfiguration.
2. Generate alternate ports in the NCP as nonswitched lines.
   • For LPDA-1 modems, generate LPDA-1 lines.
   • For LPDA-2 DCEs, generate LPDA-2 lines.
3. Create the dynamic reconfiguration definitions and store them in the VTAM® definition library. The file should include:
   • DELETE statements for the physical units being backed up
   • ADD statements to add these physical units to the backup link
4. Activate the backup line.
5. Enter a VARY DRDS command to invoke the dynamic reconfiguration. The backup switched line is now ready for use.