Hello Michael,

without aaa new-model

no aaa new-model

username usr1 password pass1

line vty 0 4

login local

with aaa new-model

aaa new-model

aaa authentication login onlylocal local

username usr1 password pass1

line vty 0 4

login authentication onlylocal

with aaa other commands can be used for accounting and authorization.

I would start with the first option

multiple username/pwds are supported

Hope to help

Giuseppe