Use sp_addserver to add entries to the sysservers table.
sp_addserver server_name [,server_class [,network_name]]
server_name is the name used to identify the server. It must be unique.
server_class is one of the supported server classes. The default value is ASEnterprise. If server_class is set to local, network_name is ignored.
network_name is the server name in the interfaces file. This name may be the same as server_name, or it may differ. The network_name is sometimes referred to as the physical name.
You must reboot SAP ASE after your add a local server.
sp_addserver big_server, local sp_addserver CTOSDEMO, ASEnterprise, CTOSDEMO