--- a/package/base-files/files/lib/functions/uci-defaults.sh
+++ b/package/base-files/files/lib/functions/uci-defaults.sh
@@ -162,7 +162,7 @@
 
 				if [ ${need_tag:-0} -eq 1 -o ${want_untag:-0} -ne 1 ]; then
 					num="${num}t"
-					device="${device}.${index}"
+					device="${device}.$((index - 1))"
 				fi
 
 				json_select roles
--- a/package/base-files/files/bin/config_generate
+++ b/package/base-files/files/bin/config_generate
@@ -151,10 +151,11 @@
 				json_get_vars ports
 			json_select ..
 
+			vlan_num=$((role - 1))
 			uci -q batch <<-EOF
 				add network switch_vlan
 				set network.@switch_vlan[-1].device='$switch'
-				set network.@switch_vlan[-1].vlan='$role'
+				set network.@switch_vlan[-1].vlan='$vlan_num'
 				set network.@switch_vlan[-1].ports='$ports'
 			EOF
 		done
--- a/target/linux/ar71xx/base-files/etc/board.d/02_network
+++ b/target/linux/ar71xx/base-files/etc/board.d/02_network
@@ -13,7 +13,7 @@
 	case "$board" in
 	airgatewaypro)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "4:lan" "5:wan"
+			"0@eth0" "4:lan" "5t:wan" "5t:dtdlink"
 		;;
 	airrouter|\
 	ap121|\
@@ -57,9 +57,9 @@
 	whr-hp-gn|\
 	wzr-hp-ag300h|\
 	zbt-we1526)
-		ucidef_set_interfaces_lan_wan "eth0.1" "eth1"
+		ucidef_set_interface_wan "eth1"
 		ucidef_add_switch "switch0" \
-			"0@eth0" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1"
+			"0@eth0" "4:lan:1" "3:lan:2" "2:lan:3" "1t:unused" "1t:dtdlink"
 		;;
 	alfa-ap120c|\
 	all0305|\
@@ -146,7 +146,8 @@
 	wifi-pineapple-nano|\
 	wndap360|\
 	wp543)
-		ucidef_set_interface_lan "eth0"
+		ucidef_set_interfaces_lan_wan "eth0" "eth0.1" 
+		ucidef_set_interface_raw "dtdlink" "eth0.2" "static"
 		;;
 	a40|\
 	a60|\
@@ -173,15 +174,16 @@
 	tl-wr810n-v2|\
 	wpe72|\
 	wrtnode2q)
-		ucidef_set_interfaces_lan_wan "eth1" "eth0"
+		ucidef_set_interfaces_lan_wan "eth0" "eth0.1"
+		ucidef_set_interface_raw "dtdlink" "eth0.2" "static"
 		;;
 	rb-750-r2|\
 	rb-750p-pbr2|\
 	rb-750up-r2|\
 	rb-951ui-2nd)
-		ucidef_set_interfaces_lan_wan "eth1.1" "eth0"
+		ucidef_set_interface_wan "eth0"
 		ucidef_add_switch "switch0" \
-			"0@eth1" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1"
+			"0@eth1" "1:lan:4" "2:lan:3" "3:lan:2" "4t:unused" "4t:dtdlink"
 		;;
 	all0258n|\
 	all0315n|\
@@ -191,7 +193,8 @@
 	ja76pf2|\
 	rocket-m-ti|\
 	ubnt-unifi-outdoor)
-		ucidef_set_interface_lan "eth0 eth1"
+		ucidef_set_interfaces_lan_wan "eth0" "eth0.1"
+		ucidef_set_interface_raw "dtdlink" "eth0.2" "static"
 		;;
 	wzr-hp-g300nh2)
 		ucidef_add_switch "switch0" \
@@ -207,7 +210,7 @@
 	wlr8100|\
 	wzr-hp-g450h)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "2:lan" "3:lan" "4:lan" "5:lan" "1:wan"
+			"0@eth0" "2:lan" "3:lan" "4:lan" "1:wan" "5t:dtdlink"
 		;;
 	ap135-020|\
 	ap136-020|\
@@ -287,7 +290,7 @@
 	wbs210|\
 	wbs510)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "5:lan" "4:wan"
+			"0@eth0" "5:lan" "4t:wan" "4t:dtdlink"
 		;;
 	cr3000)
 		ucidef_set_interfaces_lan_wan "eth0.1" "eth1"
@@ -436,7 +439,7 @@
 		;;
 	nanostation-m-xw)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "5:lan" "1:wan"
+			"0@eth0" "5:lan" "1t:wan" "1t:dtdlink"
 		;;
 	onion-omega)
 		ucidef_set_interface_lan "wlan0"
@@ -447,9 +450,9 @@
 			"0:lan:4" "1:lan:3" "2:lan:2" "3:lan:1" "5@eth1"
 		;;
 	routerstation-pro)
-		ucidef_set_interfaces_lan_wan "eth1.1" "eth0"
+		ucidef_set_interface_wan "eth0"
 		ucidef_add_switch "switch0" \
-			"0@eth1" "2:lan:3" "3:lan:2" "4:lan:1"
+			"0@eth1" "2:lan:3" "3:lan:2" "4t:unused" "4t:dtdlink"
 		;;
 	rb-493g)
 		ucidef_set_interfaces_lan_wan "eth0.1 eth1.1" "eth1.2"
@@ -550,7 +553,8 @@
 			"0@eth0" "1:lan:1" "2:lan:2" "3:lan:3" "4:lan:4" "5:wan"
 		;;
 	*)
-		ucidef_set_interfaces_lan_wan "eth0" "eth1"
+		ucidef_set_interfaces_lan_wan "eth0" "eth0.1"
+		ucidef_set_interface_raw "dtdlink" "eth0.2" "static"
 		;;
 	esac
 }