table netdev t {
	set s {
		typeof ether saddr . vlan id
		size 2048
		flags dynamic,timeout
	}

	chain c {
		ether type != 8021q add @s { ether saddr . 0 timeout 5s } counter packets 0 bytes 0 return
		ether type != 8021q update @s { ether daddr . 123 timeout 1m } counter packets 0 bytes 0 return
	}
}