LLA provides better performance when VLF services are available, so it is better (although not necessary) to start VLF before LLA. However, the operation of LLA does not depend on VLF.

//VLF     PROC  NN=00
//VLF     EXEC  PGM=COFMINIT,PARM='NN=&NN'

When you issue the START VLF command, the VLF procedure activates the IBM-supplied COFVLF00 member, which contains a CLASS statement for LLA.