+extern uchar NetEtherNullAddr[6];
+
+#define VLAN_NONE 4095 /* untagged */
+#define VLAN_IDMASK 0x0fff /* mask of valid vlan id */
+extern ushort NetOurVLAN; /* Our VLAN */
+extern ushort NetOurNativeVLAN; /* Our Native VLAN */
+
+extern uchar NetCDPAddr[6]; /* Ethernet CDP address */
+extern ushort CDPNativeVLAN; /* CDP returned native VLAN */
+extern ushort CDPApplianceVLAN; /* CDP returned appliance VLAN */