1*a3d991bdSwdenkU-Boot has networking support for VLANs (802.1q), and CDP (Cisco 2*a3d991bdSwdenkDiscovery Protocol). 3*a3d991bdSwdenk 4*a3d991bdSwdenkYou control the sending/receiving of VLAN tagged packets with the 5*a3d991bdSwdenk"vlan" environmental variable. When not present no tagging is 6*a3d991bdSwdenkperformed. 7*a3d991bdSwdenk 8*a3d991bdSwdenkCDP is used mainly to discover your device VLAN(s) when connected to 9*a3d991bdSwdenka Cisco switch. 10*a3d991bdSwdenk 11*a3d991bdSwdenkNote: In order to enable CDP support a small change is needed in the 12*a3d991bdSwdenknetworking driver. You have to enable reception of the 13*a3d991bdSwdenk01:00:0c:cc:cc:cc MAC address which is a multicast address. 14*a3d991bdSwdenk 15*a3d991bdSwdenkVarious defines control CDP; see the README section. 16