public function instances( $name = null )
    {
        if( $name === null )
            $name = $this->getSNMP()->useCisco_MST()->regionName() . '.';
            
        $hops = $this->remainingHopCount();
        
        $instances = [];
        foreach( $hops as $i => $h )
            if( $h != -1 )
                $instances[ $i ] = "{$name}{$i}";
        
        return $instances;
    }