If a request to stop the duplexing process is received while structure alter is in progress, the following general rule applies: A structure alter is automatically stopped for the structure which will be deallocated. Structure alter continues, if not already started or completed, for that structure which will remain after the stop or switch. For example, a request to stop the duplexing process is received while structure alter is in progress:

• If the old structure is being altered and a Stop Duplex request is received to keep the old structure:
  • The system issues a request to stop the alter of the new structure (which is not yet in progress)
  • All connectors receive a RebuildStop event for the new structure and respond to it
  • The new structure is deallocated
  • Structure alter completes for the old structure
  • Structure AlterBegin and AlterEnd events are not delivered for the new structure, which has now been deallocated.
• If the old structure is being altered and a Stop Duplex request is received to keep the new structure:
  • The system issues a request to stop the alter of the old structure, and proceeds to initiate alter of the new structure
  • All connectors receive a RebuildStop event for the old structure and respond to it
  • The old structure is deallocated
  • Structure alter completes for the new structure
  • Structure AlterBegin and AlterEnd events are delivered for both the new and old structures.
• If the new structure is being altered and a Stop Duplex request is received to keep the old structure:
  • The system issues a request to stop the alter of the new structure
  • All connectors receive the RebuildStop event and respond to it
  • The new structure is deallocated
  • AlterBegin and AlterEnd events are delivered for the new structure, which has now been deallocated.
• If the new structure is being altered and a Stop Duplex request is received to keep the new structure:
  • All connectors receive the RebuildStop event and respond to it
  • The old structure is deallocated
  • AlterBegin and AlterEnd events are delivered for the new structure.