Dissector for Cisco's Virtual Trunking Protocol.

svn path=/trunk/; revision=1603

1 files changed, 700 insertions, 0 deletions

diff --git a/packet-vtp.c b/packet-vtp.c
new file mode 100644
index 0000000000..d53fb13a6e
--- /dev/null
+++ b/packet-vtp.c
@@ -0,0 +1,700 @@
+/* packet-vtp.c
+ * Routines for the disassembly of Cisco's Virtual Trunking Protocol
+ *
+ * $Id: packet-vtp.c,v 1.1 2000/02/05 09:19:04 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@zing.org>
+ * Copyright 1998 Gerald Combs
+ * 
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+ 
+#include "config.h"
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <glib.h>
+#include "packet.h"
+
+/*
+ * See
+ *
+ *	http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
+ *
+ * for some information on VTP.
+ *
+ * It's incomplete, and it appears to be inaccurate in a number of places,
+ * but it's all I could find....
+ */
+
+static int proto_vtp = -1;
+static int hf_vtp_version = -1;
+static int hf_vtp_code = -1;
+static int hf_vtp_followers = -1;
+static int hf_vtp_md_len = -1;
+static int hf_vtp_md = -1;
+static int hf_vtp_conf_rev_num = -1;
+static int hf_vtp_upd_id = -1;
+static int hf_vtp_upd_ts = -1;
+static int hf_vtp_md5_digest = -1;
+static int hf_vtp_seq_num = -1;
+static int hf_vtp_start_value = -1;
+static int hf_vtp_vlan_info_len = -1;
+static int hf_vtp_vlan_status_vlan_susp = -1;
+static int hf_vtp_vlan_type = -1;
+static int hf_vtp_vlan_name_len = -1;
+static int hf_vtp_isl_vlan_id = -1;
+static int hf_vtp_mtu_size = -1;
+static int hf_vtp_802_10_index = -1;
+static int hf_vtp_vlan_name = -1;
+static int hf_vtp_vlan_tlvtype = -1;
+static int hf_vtp_vlan_tlvlength = -1;
+
+static gint ett_vtp = -1;
+static gint ett_vtp_vlan_info = -1;
+static gint ett_vtp_vlan_status = -1;
+static gint ett_vtp_tlv = -1;
+
+static int
+dissect_vlan_info(const u_char *pd, int offset, proto_tree *tree);
+static void
+dissect_vlan_info_tlv(const u_char *pd, int offset, int length,
+    proto_tree *tree, proto_item *ti, guint8 type);
+
+#define SUMMARY_ADVERT		0x01
+#define SUBSET_ADVERT		0x02
+#define ADVERT_REQUEST		0x03
+
+static const value_string type_vals[] = {
+	{ SUMMARY_ADVERT, "Summary-Advert" },
+	{ SUBSET_ADVERT,  "Subset-Advert" },
+	{ ADVERT_REQUEST, "Advert-Request" },
+	{ 0,              NULL },
+};
+	
+void 
+dissect_vtp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+{
+	proto_item *ti; 
+	proto_tree *vtp_tree = NULL;
+	guint8 code;
+	guint8 md_len;
+	int vlan_info_len;
+
+	if (check_col(fd, COL_PROTOCOL))
+		col_add_str(fd, COL_PROTOCOL, "VTP");
+	if (check_col(fd, COL_INFO))
+		col_add_str(fd, COL_INFO, "Virtual Trunking Protocol"); 
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_vtp, offset, END_OF_FRAME,
+		    NULL);
+		vtp_tree = proto_item_add_subtree(ti, ett_vtp);
+
+		proto_tree_add_item(vtp_tree, hf_vtp_version, offset, 1,
+		    pd[offset]);
+		offset += 1;
+
+		code = pd[offset];
+		proto_tree_add_item(vtp_tree, hf_vtp_code, offset, 1,
+		    code);
+		offset += 1;
+		
+		switch (code) {
+
+		case SUMMARY_ADVERT:
+			proto_tree_add_item(vtp_tree, hf_vtp_followers, offset,
+			    1, pd[offset]);
+			offset += 1;
+
+			md_len = pd[offset];
+			proto_tree_add_item(vtp_tree, hf_vtp_md_len, offset,
+			    1, md_len);
+			offset += 1;
+
+			proto_tree_add_item_format(vtp_tree, hf_vtp_md, offset,
+			    32, &pd[offset], "Management Domain: %.32s",
+			    &pd[offset]);
+			offset += 32;
+
+			proto_tree_add_item(vtp_tree, hf_vtp_conf_rev_num,
+			    offset, 4, pntohl(&pd[offset]));
+			offset += 4;
+
+			proto_tree_add_item(vtp_tree, hf_vtp_upd_id,
+			    offset, 4, &pd[offset]);
+			offset += 4;
+
+			proto_tree_add_item_format(vtp_tree, hf_vtp_upd_ts,
+			    offset, 12, &pd[offset],
+			    "Update Timestamp: %.2s-%.2s-%.2s %.2s:%.2s:%.2s",
+			    &pd[offset], &pd[offset+2], &pd[offset+4],
+			    &pd[offset+6], &pd[offset+8], &pd[offset+10]);
+			offset += 12;
+
+			proto_tree_add_item(vtp_tree, hf_vtp_md5_digest,
+			    offset, 16, &pd[offset]);
+			break;
+
+		case SUBSET_ADVERT:
+			proto_tree_add_item(vtp_tree, hf_vtp_seq_num, offset,
+			    1, pd[offset]);
+			offset += 1;
+
+			md_len = pd[offset];
+			proto_tree_add_item(vtp_tree, hf_vtp_md_len, offset,
+			    1, md_len);
+			offset += 1;
+
+			proto_tree_add_item_format(vtp_tree, hf_vtp_md, offset,
+			    32, &pd[offset], "Management Domain: %.32s",
+			    &pd[offset]);
+			offset += 32;
+
+			proto_tree_add_item(vtp_tree, hf_vtp_conf_rev_num,
+			    offset, 4, pntohl(&pd[offset]));
+			offset += 4;
+
+			for (;;) {
+				vlan_info_len = 
+				    dissect_vlan_info(pd, offset, vtp_tree);
+				if (vlan_info_len < 0)
+					break;
+				offset += vlan_info_len;
+			}
+			break;
+
+		case ADVERT_REQUEST:
+			offset += 1;	/* skip reserved field */
+
+			md_len = pd[offset];
+			proto_tree_add_item(vtp_tree, hf_vtp_md_len, offset,
+			    1, md_len);
+			offset += 1;
+
+			proto_tree_add_item(vtp_tree, hf_vtp_start_value,
+			    offset, 2, pntohs(&pd[offset]));
+			break;
+
+		case 0x04:
+			/*
+			 * Mysterious type, seen a lot.
+			 * Is this some mutant variant of Advert-Request?
+			 */
+			offset += 1;	/* skip unknown field */
+
+			md_len = pd[offset];
+			proto_tree_add_item(vtp_tree, hf_vtp_md_len, offset,
+			    1, md_len);
+			offset += 1;
+
+			proto_tree_add_item_format(vtp_tree, hf_vtp_md, offset,
+			    32, &pd[offset], "Management Domain: %.32s",
+			    &pd[offset]);
+			offset += 32;
+
+			offset += 2;	/* skip unknown field */
+
+			proto_tree_add_text(vtp_tree, offset, 2,
+			    "VLAN ID of some sort: 0x%04x",
+			    pntohs(&pd[offset]));
+			offset += 2;
+			break;
+		}
+	}
+}
+
+#define	VLAN_SUSPENDED	0x01
+
+static const value_string vlan_type_vals[] = {
+	{ 0x01, "Ethernet" },
+	{ 0x02, "FDDI" },
+	{ 0x03, "TrCRF" },
+	{ 0x04, "FDDI-net" },
+	{ 0x05, "TrBRF" },
+	{ 0,    NULL },
+};
+
+#define	SR_RING_NUM		0x01
+#define	SR_BRIDGE_NUM		0x02
+#define	STP_TYPE		0x03
+#define	PARENT_VLAN		0x04
+#define	TR_BRIDGED_VLANS	0x05
+#define	PRUNING			0x06
+#define	BRIDGE_TYPE		0x07
+#define	MAX_ARE_HOP_CNT		0x08
+#define	MAX_STE_HOP_CNT		0x09
+#define	BACKUP_CRF_MODE		0x0A
+
+static const value_string vlan_tlv_type_vals[] = {
+	{ SR_RING_NUM,      "Source-Routing Ring Number" },
+	{ SR_BRIDGE_NUM,    "Source-Routing Bridge Number" },
+	{ STP_TYPE,         "Spanning-Tree Protocol Type" },
+	{ PARENT_VLAN,      "Parent VLAN" },
+	{ TR_BRIDGED_VLANS, "Translationally Bridged VLANs" },
+	{ PRUNING,          "Pruning" },
+	{ BRIDGE_TYPE,      "Bridge Type" },
+	{ MAX_ARE_HOP_CNT,  "Max ARE Hop Count" },
+	{ MAX_STE_HOP_CNT,  "Max STE Hop Count" },
+	{ BACKUP_CRF_MODE,  "Backup CRF Mode" },
+	{ 0,                NULL },
+};
+
+static int
+dissect_vlan_info(const u_char *pd, int offset, proto_tree *tree)
+{
+	proto_item *ti; 
+	proto_tree *vlan_info_tree;
+	proto_tree *status_tree;
+	guint8 vlan_info_len;
+	int vlan_info_left;
+	guint8 status;
+	guint8 vlan_name_len;
+	guint16 type;
+	int length;
+	char *type_str;
+	proto_tree *tlv_tree;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 1))
+		return -1;
+	vlan_info_len = pd[offset];
+	ti = proto_tree_add_text(tree, offset, vlan_info_len,
+	    "VLAN Information");
+	vlan_info_tree = proto_item_add_subtree(ti, ett_vtp_vlan_info);
+	vlan_info_left = vlan_info_len;
+
+	proto_tree_add_item(vlan_info_tree, hf_vtp_vlan_info_len, offset, 1,
+	    vlan_info_len);
+	offset += 1;
+	vlan_info_left -= 1;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 1) || vlan_info_left < 1)
+		return -1;
+	status = pd[offset];
+	ti = proto_tree_add_text(vlan_info_tree, offset, 1,
+	    "Status: 0x%02x%s", status,
+	    (status & VLAN_SUSPENDED) ? "(VLAN suspended)" : "");
+	status_tree = proto_item_add_subtree(ti, ett_vtp_vlan_status);
+	proto_tree_add_item(status_tree, hf_vtp_vlan_status_vlan_susp, offset, 1,
+	    status);
+	offset += 1;
+	vlan_info_left -= 1;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 1) || vlan_info_left < 1)
+		return -1;
+	proto_tree_add_item(vlan_info_tree, hf_vtp_vlan_type, offset, 1,
+	    pd[offset]);
+	offset += 1;
+	vlan_info_left -= 1;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 1) || vlan_info_left < 1)
+		return -1;
+	vlan_name_len = pd[offset];
+	proto_tree_add_item(vlan_info_tree, hf_vtp_vlan_name_len, offset, 1,
+	    vlan_name_len);
+	offset += 1;
+	vlan_info_left -= 1;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 2) || vlan_info_left < 2)
+		return -1;
+	proto_tree_add_item(vlan_info_tree, hf_vtp_isl_vlan_id, offset, 2,
+	    pntohs(&pd[offset]));
+	offset += 2;
+	vlan_info_left -= 2;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 2) || vlan_info_left < 2)
+		return -1;
+	proto_tree_add_item(vlan_info_tree, hf_vtp_mtu_size, offset, 2,
+	    pntohs(&pd[offset]));
+	offset += 2;
+	vlan_info_left -= 2;
+
+	if (!BYTES_ARE_IN_FRAME(offset, 4) || vlan_info_left < 4)
+		return -1;
+	proto_tree_add_item(vlan_info_tree, hf_vtp_802_10_index, offset, 4,
+	    pntohl(&pd[offset]));
+	offset += 4;
+	vlan_info_left -= 4;
+
+	/* VLAN name length appears to be rounded up to a multiple of
+	   4. */
+	vlan_name_len = 4*((vlan_name_len + 3)/4);
+	if (!BYTES_ARE_IN_FRAME(offset, vlan_name_len)
+	    || vlan_info_left < vlan_name_len)
+		return -1;
+	proto_tree_add_item_format(vlan_info_tree, hf_vtp_vlan_name, offset,
+	    vlan_name_len, &pd[offset], "VLAN Name: %.*s", vlan_name_len,
+	    &pd[offset]);
+	offset += vlan_name_len;
+	vlan_info_left -= vlan_name_len;
+
+	while (IS_DATA_IN_FRAME(offset) && vlan_info_left > 0) {
+		type = pd[offset + 0];
+		length = pd[offset + 1];
+		type_str = val_to_str(type, vlan_tlv_type_vals,
+		    "Unknown (0x%04x)");
+
+		ti = proto_tree_add_notext(vlan_info_tree, offset,
+		    2 + length*2);
+		tlv_tree = proto_item_add_subtree(ti, ett_vtp_tlv);
+		proto_tree_add_item(tlv_tree, hf_vtp_vlan_tlvtype, offset,
+		    1, type);
+		proto_tree_add_item(tlv_tree, hf_vtp_vlan_tlvlength, offset+1,
+		    1, length);
+		offset += 2;
+		vlan_info_left -= 2;
+		if (length > 0) {
+			dissect_vlan_info_tlv(pd, offset, length*2, tlv_tree,
+			    ti, type);
+		}
+		offset += length*2;
+		vlan_info_left -= length*2;
+	}
+
+	return vlan_info_len;
+}
+
+static const value_string stp_type_vals[] = {
+	{ 1, "SRT" },
+	{ 2, "SRB" },
+	{ 3, "Auto" },
+	{ 0, NULL },
+};
+
+static const value_string pruning_vals[] = {
+	{ 1, "Enabled" },
+	{ 2, "Disabled" },
+	{ 0, NULL },
+};
+
+static const value_string bridge_type_vals[] = {
+	{ 1, "SRT" },
+	{ 2, "SRB" },
+	{ 0, NULL },
+};
+
+static const value_string backup_crf_mode_vals[] = {
+	{ 1, "TrCRF is configured as a backup" },
+	{ 2, "TrCRF is not configured as a backup" },
+	{ 0, NULL },
+};
+
+static void
+dissect_vlan_info_tlv(const u_char *pd, int offset, int length,
+    proto_tree *tree, proto_item *ti, guint8 type)
+{
+	switch (type) {
+
+	case SR_RING_NUM:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Source-Routing Ring Number: 0x%04x",
+			    pntohs(&pd[offset]));
+			proto_tree_add_text(tree, offset, 2,
+			    "Source-Routing Ring Number: 0x%04x",
+			    pntohs(&pd[offset]));
+		} else {
+			proto_item_set_text(ti,
+			    "Source-Routing Ring Number: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Source-Routing Ring Number: Bad length %u",
+			    length);
+		}
+		break;
+
+	case SR_BRIDGE_NUM:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Source-Routing Bridge Number: 0x%04x",
+			    pntohs(&pd[offset]));
+			proto_tree_add_text(tree, offset, 2,
+			    "Source-Routing Bridge Number: 0x%04x",
+			    pntohs(&pd[offset]));
+		} else {
+			proto_item_set_text(ti,
+			    "Source-Routing Bridge Number: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Source-Routing Bridge Number: Bad length %u",
+			    length);
+		}
+		break;
+
+	case STP_TYPE:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Spanning-Tree Protocol Type: %s",
+			    val_to_str(pntohs(&pd[offset]), stp_type_vals,
+			      "Unknown (0x%04x)"));
+			proto_tree_add_text(tree, offset, 2,
+			    "Spanning-Tree Protocol Type: %s",
+			    val_to_str(pntohs(&pd[offset]), stp_type_vals,
+			      "Unknown (0x%04x)"));
+		} else {
+			proto_item_set_text(ti,
+			    "Spanning-Tree Protocol Type: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Spanning-Tree Protocol Type: Bad length %u",
+			    length);
+		}
+		break;
+
+	case PARENT_VLAN:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Parent VLAN: 0x%04x",
+			    pntohs(&pd[offset]));
+			proto_tree_add_text(tree, offset, 2,
+			    "Parent VLAN: 0x%04x",
+			    pntohs(&pd[offset]));
+		} else {
+			proto_item_set_text(ti,
+			    "Parent VLAN: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Parent VLAN: Bad length %u",
+			    length);
+		}
+		break;
+
+	case TR_BRIDGED_VLANS:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Translationally Bridged VLANs: 0x%04x",
+			    pntohs(&pd[offset]));
+			proto_tree_add_text(tree, offset, 2,
+			    "Translationally Bridged VLANs: 0x%04x",
+			    pntohs(&pd[offset]));
+		} else {
+			proto_item_set_text(ti,
+			    "Translationally Bridged VLANs: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Translationally Bridged VLANs: Bad length %u",
+			    length);
+		}
+		break;
+
+	case PRUNING:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Pruning: %s",
+			    val_to_str(pntohs(&pd[offset]), pruning_vals,
+			      "Unknown (0x%04x)"));
+			proto_tree_add_text(tree, offset, 2,
+			    "Pruning: %s",
+			    val_to_str(pntohs(&pd[offset]), pruning_vals,
+			      "Unknown (0x%04x)"));
+		} else {
+			proto_item_set_text(ti,
+			    "Pruning: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Pruning: Bad length %u",
+			    length);
+		}
+		break;
+
+	case BRIDGE_TYPE:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Bridge Type: %s",
+			    val_to_str(pntohs(&pd[offset]), bridge_type_vals,
+			      "Unknown (0x%04x)"));
+			proto_tree_add_text(tree, offset, 2,
+			    "Bridge Type: %s",
+			    val_to_str(pntohs(&pd[offset]), bridge_type_vals,
+			      "Unknown (0x%04x)"));
+		} else {
+			proto_item_set_text(ti,
+			    "Bridge Type: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Bridge Type: Bad length %u",
+			    length);
+		}
+		break;
+
+	case MAX_ARE_HOP_CNT:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Max ARE Hop Count: %u",
+			    pntohs(&pd[offset]));
+			proto_tree_add_text(tree, offset, 2,
+			    "Max ARE Hop Count: %u",
+			    pntohs(&pd[offset]));
+		} else {
+			proto_item_set_text(ti,
+			    "Max ARE Hop Count: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Max ARE Hop Count: Bad length %u",
+			    length);
+		}
+		break;
+
+	case MAX_STE_HOP_CNT:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Max STE Hop Count: %u",
+			    pntohs(&pd[offset]));
+			proto_tree_add_text(tree, offset, 2,
+			    "Max STE Hop Count: %u",
+			    pntohs(&pd[offset]));
+		} else {
+			proto_item_set_text(ti,
+			    "Max STE Hop Count: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Max STE Hop Count: Bad length %u",
+			    length);
+		}
+		break;
+
+	case BACKUP_CRF_MODE:
+		if (length == 2) {
+			proto_item_set_text(ti,
+			    "Backup CRF Mode: %s",
+			    val_to_str(pntohs(&pd[offset]), backup_crf_mode_vals,
+			      "Unknown (0x%04x)"));
+			proto_tree_add_text(tree, offset, 2,
+			    "Backup CRF Mode: %s",
+			    val_to_str(pntohs(&pd[offset]), backup_crf_mode_vals,
+			      "Unknown (0x%04x)"));
+		} else {
+			proto_item_set_text(ti,
+			    "Backup CRF Mode: Bad length %u",
+			    length);
+			proto_tree_add_text(tree, offset, length,
+			    "Backup CRF Mode: Bad length %u",
+			    length);
+		}
+		break;
+
+	default:
+		proto_item_set_text(ti, "Unknown TLV type: 0x%02x", type);
+		proto_tree_add_text(tree, offset, length, "Data");
+		break;
+	}
+}
+
+void
+proto_register_vtp(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_vtp_version,
+		{ "Version",	"vtp.version", FT_UINT8, BASE_HEX, NULL, 0x0,
+			"" }},
+
+		{ &hf_vtp_code,
+		{ "Code",	"vtp.code", FT_UINT8, BASE_HEX, VALS(type_vals), 0x0,
+			"" }},
+
+		{ &hf_vtp_followers,
+		{ "Followers",	"vtp.followers", FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Number of following Subset-Advert messages" }},
+
+		{ &hf_vtp_md_len,
+		{ "Management Domain Length", "vtp.md_len", FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Length of management domain string" }},
+
+		{ &hf_vtp_md,
+		{ "Management Domain", "vtp.md", FT_STRING, BASE_DEC, NULL, 0,
+			"Management domain" }},
+
+		{ &hf_vtp_conf_rev_num,
+		{ "Configuration Revision Number", "vtp.conf_rev_num", FT_UINT32, BASE_DEC, NULL, 0x0,
+			"Revision number of the configuration information" }},
+
+		{ &hf_vtp_upd_id,
+		{ "Updater Identity", "vtp.upd_id", FT_IPv4, BASE_NONE, NULL, 0x0,
+			"IP address of the updater" }},
+
+		{ &hf_vtp_upd_ts,
+		{ "Update Timestamp", "vtp.upd_ts", FT_STRING, BASE_DEC, NULL, 0,
+			"Time stamp of the current configuration revision" }},
+
+		{ &hf_vtp_md5_digest,
+		{ "MD5 Digest",	"vtp.md5_digest", FT_BYTES, BASE_HEX, NULL, 0x0,
+			"" }},
+
+		{ &hf_vtp_seq_num,
+		{ "Sequence Number",	"vtp.seq_num", FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Order of this frame in the sequence of Subset-Advert frames" }},
+
+		{ &hf_vtp_start_value,
+		{ "Start Value",	"vtp.start_value", FT_UINT16, BASE_HEX, NULL, 0x0,
+			"Virtual LAN ID of first VLAN for which information is requested" }},
+
+		{ &hf_vtp_vlan_info_len,
+		{ "VLAN Information Length",	"vtp.vlan_info.len", FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Length of the VLAN information field" }},
+
+		{ &hf_vtp_vlan_status_vlan_susp,
+		{ "VLAN suspended",	"vtp.vlan_info.status.vlan_susp", FT_BOOLEAN, 8, NULL, VLAN_SUSPENDED,
+			"VLAN suspended" }},
+
+		{ &hf_vtp_vlan_type,
+		{ "VLAN Type",	"vtp.vlan_info.vlan_type", FT_UINT8, BASE_HEX, VALS(vlan_type_vals), 0x0,
+			"Type of VLAN" }},
+
+		{ &hf_vtp_vlan_name_len,
+		{ "VLAN Name Length", "vtp.vlan_info.vlan_name_len", FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Length of VLAN name string" }},
+
+		{ &hf_vtp_isl_vlan_id,
+		{ "ISL VLAN ID",	"vtp.vlan_info.isl_vlan_id", FT_UINT16, BASE_HEX, NULL, 0x0,
+			"ID of this VLAN on ISL trunks" }},
+
+		{ &hf_vtp_mtu_size,
+		{ "MTU Size",	"vtp.vlan_info.mtu_size", FT_UINT16, BASE_DEC, NULL, 0x0,
+			"MTU for this VLAN" }},
+
+		{ &hf_vtp_802_10_index,
+		{ "802.10 Index", "vtp.vlan_info.802_10_index", FT_UINT32, BASE_HEX, NULL, 0x0,
+			"IEEE 802.10 security association identifier for this VLAN" }},
+
+		{ &hf_vtp_vlan_name,
+		{ "VLAN Name", "vtp.vlan_info.vlan_name", FT_STRING, BASE_DEC, NULL, 0,
+			"VLAN name" }},
+
+		{ &hf_vtp_vlan_tlvtype,
+		{ "Type",	"vtp.vlan_info.tlv_type", FT_UINT8, BASE_HEX, VALS(vlan_tlv_type_vals), 0x0,
+			"" }},
+
+		{ &hf_vtp_vlan_tlvlength,
+		{ "Length",	"vtp.vlan_info.tlv_len", FT_UINT8, BASE_DEC, NULL, 0x0,
+			"" }},
+        };
+	static gint *ett[] = {
+		&ett_vtp,
+		&ett_vtp_vlan_info,
+		&ett_vtp_vlan_status,
+		&ett_vtp_tlv,
+	};
+
+        proto_vtp = proto_register_protocol("Virtual Trunking Protocol", "vtp");
+        proto_register_field_array(proto_vtp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}