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-U-Boot has networking support for VLANs (802.1q), and CDP (Cisco
-Discovery Protocol).
-
-You control the sending/receiving of VLAN tagged packets with the
-"vlan" environmental variable. When not present no tagging is
-performed.
-
-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.