proc CreateQinQStackAndTrackHlt { packetStack } {
    foreach stack $packetStack {
	if {[regexp "vlan" $stack]} {
	    puts "\nCreateQinQStackAndTrackHlt: $stack" 
	    set streamResult [::ixia::traffic_config  \
				  -mode modify \
				  -stream_id $stack \
				  -vlan enable \
				  -vlan_id_tracking 1 \
				 ]
	    if {[keylget streamResult status] != $::SUCCESS} {
		puts "\nError CreateQinQStackAndTrackHlt: $stack\n"
		return 1
	    }
	}
    }
    return 0
}