code: function updateLastRoundIndexFromPeers( nLastRoundIndex, nLastMainChainIndex )
  {
  	if ( 'number' === typeof nLastRoundIndex && nLastRoundIndex > 0 &&
  		 'number' === typeof nLastMainChainIndex && nLastMainChainIndex > 0 )
  	{
  		if ( null === _nLastRoundIndexFromPeers || nLastRoundIndex > _nLastRoundIndexFromPeers ||
  			 null === _nLastMainChainIndexFromPeers || nLastMainChainIndex > _nLastMainChainIndexFromPeers )
  		{
  			_nLastRoundIndexFromPeers = nLastRoundIndex;
  			_nLastMainChainIndexFromPeers = nLastMainChainIndex;
  			_event_bus.emit( 'updated_last_round_index_from_peers', _nLastRoundIndexFromPeers, _nLastMainChainIndexFromPeers );
  		}
  	}
  }
docs: update last round index from all outbound peers
  @return	{void}