|U-Boot has networking support for VLANs (802.1q), and CDP (Cisco
|You control the sending/receiving of VLAN tagged packets with the
|"vlan" environmental variable. When not present no tagging is
|CDP is used mainly to discover your device VLAN(s) when connected to
|a Cisco switch.
|Note: In order to enable CDP support a small change is needed in the
|networking driver. You have to enable reception of the
|01:00:0c:cc:cc:cc MAC address which is a multicast address.
|Various defines control CDP; see the README section.