diff --git a/target/linux/ath79/generic/base-files/etc/board.d/02_network b/target/linux/ath79/generic/base-files/etc/board.d/02_network
index 1d5ddc605c..24487f0c90 100644
--- a/target/linux/ath79/generic/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/generic/base-files/etc/board.d/02_network
@@ -136,7 +136,7 @@ ath79_setup_interfaces()
 		;;
 	airtight,c-75)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "2:wan" "3:lan" "6@eth1"
+			"0u@eth0" "2:wan" "3:lan" "6u@eth1"
 		;;
 	alfa-network,ap121fe)
 		ucidef_set_interface_lan "eth0 usb0"
@@ -200,7 +200,7 @@ ath79_setup_interfaces()
 	tplink,tl-wdr4900-v2|\
 	tplink,tl-wdr7500-v3)
 		ucidef_add_switch "switch0" \
-			"0@eth1" "2:lan" "3:lan" "4:lan" "5:lan" "6@eth0" "1:wan"
+			"0u@eth1" "2:lan" "3:lan" "4:lan" "5:lan" "6u@eth0" "1:wan"
 		;;
 	buffalo,bhr-4grv|\
 	buffalo,wzr-hp-g450h)
@@ -210,11 +210,11 @@ ath79_setup_interfaces()
 	buffalo,bhr-4grv2|\
 	trendnet,tew-823dru)
 		ucidef_add_switch "switch0" \
-			"0@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6@eth0"
+			"0u@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6u@eth0"
 		;;
 	buffalo,wzr-450hp2)
 		ucidef_add_switch "switch0" \
-			"6@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "0@eth0"
+			"6u@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "0u@eth0"
 		;;
 	buffalo,wzr-600dhp|\
 	buffalo,wzr-hp-ag300h|\
@@ -287,7 +287,7 @@ ath79_setup_interfaces()
 	comfast,cf-wr650ac-v2|\
 	zyxel,nbg6616)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6@eth1"
+			"0u@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6u@eth1"
 		;;
 	compex,wpj344-16m|\
 	compex,wpj563)
@@ -301,7 +301,7 @@ ath79_setup_interfaces()
 	dell,apl26-0ae|\
 	dell,apl27-0b1)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "2:lan:1" "3:lan:2" "6@eth1"
+			"0u@eth0" "2:lan:1" "3:lan:2" "6u@eth1"
 		;;
 	devolo,dlan-pro-1200plus-ac|\
 	devolo,magic-2-wifi)
@@ -318,11 +318,11 @@ ath79_setup_interfaces()
 		;;
 	dlink,dap-2695-a1)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "2:lan" "3:wan" "6@eth1"
+			"0u@eth0" "2:lan" "3:wan" "6u@eth1"
 		;;
 	dlink,dap-3662-a1)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "1:lan:2" "2:lan:1" "6@eth1"
+			"0u@eth0" "1:lan:2" "2:lan:1" "6u@eth1"
 		;;
 	dlink,dch-g020-a1)
 		ucidef_add_switch "switch0" \
@@ -393,7 +393,7 @@ ath79_setup_interfaces()
 		;;
 	jjplus,jwap230)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "5:wan:1" "1:lan:2" "6@eth1"
+			"0u@eth0" "5:wan:1" "1:lan:2" "6u@eth1"
 		;;
 	joyit,jt-or750i)
 		ucidef_set_interface_wan "eth1"
@@ -416,7 +416,7 @@ ath79_setup_interfaces()
 		;;
 	librerouter,librerouter-v1)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "5:wan" "6@eth1" "4:lan"
+			"0u@eth0" "5:wan" "6u@eth1" "4:lan"
 		;;
 	longdata,aps256)
 		ucidef_set_interface_wan "eth1"
@@ -512,7 +512,7 @@ ath79_setup_interfaces()
 		;;
 	ruckus,r500)
 		ucidef_add_switch "switch0" \
-			"6u@eth0" "5:lan:1" "3:lan:2" "0@eth1"
+			"6u@eth0" "5:lan:1" "3:lan:2" "0u@eth1"
 		;;
 	teltonika,rut955|\
 	teltonika,rut955-h7v3c0)
@@ -527,7 +527,7 @@ ath79_setup_interfaces()
 	tplink,archer-d7-v1|\
 	tplink,archer-d7b-v1)
 		ucidef_add_switch "switch0" \
-			"0@eth1" "3:lan:3" "4:lan:2" "5:lan:1" "6@eth0" "2:wan:4" "1:wan:5"
+			"0u@eth1" "3:lan:3" "4:lan:2" "5:lan:1" "6u@eth0" "2:wan:4" "1:wan:5"
 		;;
 	tplink,deco-m4r-v1|\
 	tplink,deco-s4-v2)
@@ -567,7 +567,7 @@ ath79_setup_interfaces()
 	tplink,tl-wr1043nd-v3|\
 	tplink,tl-wr1045nd-v2)
 		ucidef_add_switch "switch0" \
-			"0@eth1" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1" "5:wan" "6@eth0"
+			"0u@eth1" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1" "5:wan" "6u@eth0"
 		;;
 	tplink,tl-wr2543-v1)
 		ucidef_add_switch "switch0" \
diff --git a/target/linux/ath79/nand/base-files/etc/board.d/02_network b/target/linux/ath79/nand/base-files/etc/board.d/02_network
index 362898630f..2f0b74e5ff 100644
--- a/target/linux/ath79/nand/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/nand/base-files/etc/board.d/02_network
@@ -13,7 +13,7 @@ ath79_setup_interfaces()
 		;;
 	domywifi,dw33d)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "1:wan" "2:lan" "3:lan" "4:lan" "5:lan" "6@eth1"
+			"0u@eth0" "1:wan" "2:lan" "3:lan" "4:lan" "5:lan" "6u@eth1"
 		;;
 	dongwon,dw02-412h-64m|\
 	dongwon,dw02-412h-128m)
@@ -42,7 +42,7 @@ ath79_setup_interfaces()
 		;;
 	linksys,ea4500-v3)
 		ucidef_add_switch "switch0" \
-			"6@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "0@eth0"
+			"6u@eth1" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "0u@eth0"
 		;;
 	netgear,pgzng1)
 		ucidef_set_interfaces_lan_wan "eth1" "eth0"
@@ -81,7 +81,7 @@ ath79_setup_interfaces()
 	zyxel,emg2926-q10a|\
 	zyxel,nbg6716)
 		ucidef_add_switch "switch0" \
-			"0@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6@eth1"
+			"0u@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan" "6u@eth1"
 		;;
 	*)
 		ucidef_set_interfaces_lan_wan "eth0" "eth1"