Switch fails to get IP address from DHCP when server is not up during booting
Using ifplugd, WR Switch gets IP address from DHCP server only when the link goes up. That means if the switch starts with link up on the management port, but the DHCP server is not ready and won't respond to DHCP requests, WR Switch won't ever get the IP address. Ifplugd runs DHCP client (udhcpc) with "-n" option on link up, making it exit when a few attempts to reach DHCP server are not answered.