If you want concise output, you might try my module Data::XDumper instead: it tries to dump sub-structures on a single line whenever possible without exceeding some (configurable) line length.

More like:

{
   tree => {
      'att-2' => {1 => 'att-products', 2 => 'att-mgmt'},
      'att-products' => {9 => 'att-cnmAgent'},
      attCNMds1ErrorsEntry => {
         1 => 'attCNMds1ErrorsIndex',
         2 => 'attCNMds1ErrorsInterval',
         3 => 'attCNMds1ErrorsTimeStamp',
         9 => 'attCNMds1ESs'
      },
      attCNMds1ErrorsTable => {1 => 'attCNMds1ErrorsEntry'},
      attCNMds1StatusEntry => {
         1 => 'attCNMds1StatusIndex',
         2 => 'attCNMds1LineStatus'
      },
      attCNMds1StatusTable => {1 => 'attCNMds1StatusEntry'},
      enterprises => {74 => 'att-2'}
   }
}
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(this is with prefix set to "" because you don't have any cross-references, and a reduced maximum line length)