u-boot/doc/README.VLAN
wdenk a3d991bd0d Patches by Pantelis Antoniou, 30 Mar 2004:
add networking support for VLANs (802.1q), and CDP (Cisco Discovery Protocol)
2004-04-15 21:48:45 +00:00

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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.