In Debian Bug #799042 at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=799042 Vincent Lefevre observes on CUPS 2.3.0-7 (with a default destination set) that

Since lip-multi-1 is the default printer (note: none of the LPDEST and
PRINTER environment variables are set, so that the default destination
is obtained from ~/.cups/lpoptions), "lpoptions" should be equivalent
to "lpoptions -plip-multi-1", as documented.

Regards,

Brian.