# sample data
my %network = ( 10.1.0.1, { 'name' => 'vlan 2' }
                 10.2.0.2, { 'name' => 'vlan 3' } );

foreach my $network (sort { by_num($networks{$a}->{'name'}) <=> by_num($networks{$b}->{'name'})
                             or $a cmp $b } keys %networks )
{
      # do stuff...
}

# Extract the number from a string
# Used to sort Network names by vlan number, rather than alphabetically
sub by_num
{
        my $key = shift;
        $key =~ /(\d+)/;
        return $1;
}

##</code><code>##

#### untested/concept code below

# set the following to either 'alpha' or 'num'
$sortby= 'alpha';

my %sort_network;

$sort_network{'alpha'} = sub { $a->{'name'} cmp $b->{'name'} };
$sort_network{'num'} = sub { by_num($a->{'name'}) <=> by_num($b->{'name'} )
                              or $a->{'name'} cmp $b->{'name'};

foreach my $network (sort &$sort_network{$sortby} keys %networks )
{
      # do stuff...
}