1 U-Boot has networking support for VLANs (802.1q), and CDP (Cisco 2 Discovery Protocol). 3 4 You control the sending/receiving of VLAN tagged packets with the 5 "vlan" environmental variable. When not present no tagging is 6 performed. 7 8 CDP is used mainly to discover your device VLAN(s) when connected to 9 a Cisco switch. 10 11 Note: In order to enable CDP support a small change is needed in the 12 networking driver. You have to enable reception of the 13 01:00:0c:cc:cc:cc MAC address which is a multicast address. 14 15 Various defines control CDP; see the README section. 16
