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use strict;
use warnings;
...
}

print Dumper \%key_hash;

__DATA__
KEY: request_1.3.6.1.2.1.2.2.1.12.27
...
OID: 1.3.6.1.2.1.2.2.1.3.27
NAME: ifType.27
Error Status No error

$VAR1 = {
   'request_1.3.6.1.2.1.2.2.1.12.27' => {
...
        'Error_Status' => 'No error'
   }
 };