diff -Naur Net-CDP-0.09/libcdp/src/encoding.c Net-CDP-0.09.new/libcdp/src/encoding.c
--- Net-CDP-0.09/libcdp/src/encoding.c	2005-07-20 21:44:13.000000000 +0800
+++ Net-CDP-0.09.new/libcdp/src/encoding.c	2007-11-04 14:49:57.000000000 +0800
@@ -236,32 +236,46 @@
 		case CDP_TYPE_APPLIANCE_REPLY:
 			if (packet->appliance)
 				DUPLICATE("Appliance VLAN-ID Reply TLV");
+            /*
 			if (tlv_length != sizeof(uint8_t) + sizeof(uint16_t))
 				INVALID2("Appliance VLAN-ID Reply TLV length (not %d)",
 					sizeof(uint8_t) + sizeof(uint16_t));
+               */
 			{
 				uint8_t id;
 				uint16_t vlan;
+            uint8_t pad;
+            
 				if (!GRAB_UINT8(id))
 					EOP("appliance ID in Appliance VLAN-ID Reply TLV");
 				if (!GRAB_UINT16(vlan))
 					EOP("appliance VLAN in Appliance VLAN-ID Reply TLV");
+            if (tlv_length == (sizeof(uint8_t) + sizeof(uint16_t)+sizeof(uint8_t))) {
+               if (!GRAB_UINT8(pad))
+                  EOP("Pad Byte in Appliance VLAN-ID Reply TLV");
+            }
 				packet->appliance = cdp_appliance_new(id, vlan);
 			}
 			break;
 		case CDP_TYPE_APPLIANCE_QUERY:
 			if (packet->appliance_query)
 				DUPLICATE("Appliance VLAN-ID Query TLV");
+         /*
 			if (tlv_length != sizeof(uint8_t) + sizeof(uint16_t))
 				INVALID2("Appliance VLAN-ID TLV Query length (not %d)",
 					sizeof(uint8_t) + sizeof(uint16_t));
+               */
 			{
 				uint8_t id;
 				uint16_t vlan;
+				uint8_t pad;
+
 				if (!GRAB_UINT8(id))
 					EOP("appliance ID in Appliance VLAN-ID Query TLV");
 				if (!GRAB_UINT16(vlan))
 					EOP("appliance VLAN in Appliance VLAN-ID Query TLV");
+            if (!GRAB_UINT8(pad))
+					EOP("Pad Byte in Appliance VLAN-ID Reply TLV");
 				packet->appliance_query =
 					cdp_appliance_new(id, vlan);
 			}
@@ -369,6 +383,7 @@
 	return packet;
 
 fail:
+   fprintf(stderr, "\n\nSome error: %s\n\n", errors);
 	cdp_packet_free(packet);
 	
 	return NULL;
@@ -552,7 +567,8 @@
 	if (packet->appliance_query && !(
 		START_TLV(CDP_TYPE_APPLIANCE_QUERY) &&
 		PUSH_UINT8(packet->appliance_query->id) &&
-		PUSH_UINT16(packet->appliance_query->vlan)
+		PUSH_UINT16(packet->appliance_query->vlan) &&
+		PUSH_UINT8(0x01)
 	))
 		return 0;
 	END_TLV;