Yes - you are asking the right questions - so you are close to "getting it".

When you invoke

  $cisco->login_auth( $whatever );
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you are actually passing TWO parameters into login_auth - which you can retrieve using:

sub login_auth{
  my ($self, $whatever) = @_;
  # Now $self contains whatever sub new() put into it.
  # and $self can be updated to include more useful things.
}
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Instead of passing @ARGV, you should pass it as a reference : \@ARGV.

This will allow passing additional parameters if necessary.

OK - next question ?...