You could construct a HoA keyed by IP with the values being anonymous arrays of concatenated component and eth. Any array with more than one element will show a positive match.

use strict;
use warnings;

use Data::Dumper;

my %components = (
   COMP1 => {
            eth1    => q{10.172.9.21/24},
            eth1_gw => q{10.172.1.1},
            eth2    => q{10.172.10.21/24},
        },
   COMP2 => {
            eth1    => q{10.172.9.22/24},
            eth2    => q{10.172.11.21/24},
        },
   COMP3 => {
            eth1    => q{10.172.11.21/24},
            eth2    => q{10.172.13.21/24},
            eth3    => q{10.173.2.98/24},
        },
  );

my %byIP = ();
foreach my $comp ( keys %components )
{
    foreach my $eth ( keys %{ $components{ $comp } } )
    {
        push @{ $byIP{ $components{ $comp }->{ $eth } } },
           qq{$comp:$eth};
    }
}

print Data::Dumper->Dumpxs( [ \ %byIP ], [ qw{ *byIP } ] );

[download]

The Data::Dumper output showing that "COMP2 eth2" and "COMP3 eth1" match.

%byIP = (
          '10.172.9.22/24' => [
                                'COMP2:eth1'
                              ],
          '10.172.1.1' => [
                            'COMP1:eth1_gw'
                          ],
          '10.172.10.21/24' => [
                                 'COMP1:eth2'
                               ],
          '10.172.9.21/24' => [
                                'COMP1:eth1'
                              ],
          '10.172.11.21/24' => [
                                 'COMP3:eth1',
                                 'COMP2:eth2'
                               ],
          '10.173.2.98/24' => [
                                'COMP3:eth3'
                              ],
          '10.172.13.21/24' => [
                                 'COMP3:eth2'
                               ]
        );

[download]

I hope this is useful.

Cheers,

JohnGG

Update: Sorry, I should have read ig's reply properly before posting this. My solutions is essentially identical to his second solution. Please ++ his post, not mine.

In reply to Re: Comparing hash values against other hash values by johngg
in thread Comparing hash values against other hash values by carcassonne

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