Include the Backup Server name when you using the shutdown command.
The default is with wait, so any dumps or loads in progress complete before the Backup Server process halts. After you issue a shutdown command, no new dump or load sessions can be started on the Backup Server.
Listed in sysservers on your SAP ASE, and
Listed in your local interfaces file.
Use sp_addserver to add a Backup Server to sysservers.