Guest

Virtual LANs/VLAN Trunking Protocol (VLANs/VTP)

Configuring VLAN Trunk Protocol (VTP)

Document ID: 98154

Updated: Nov 29, 2011

   Print

Introduction

This document provides information on how to configure VLAN Trunk Protocol (VTP). VTP reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst series products.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Understand VTP

Refer to Understanding VLAN Trunk Protocol (VTP) for more information on VTP.

VTP Configuration Guidelines

This section provides some guidelines for the configuration of VTP in the network.

  • All switches have the same the VTP domain name, unless the network design insists for different VTP domains.

    Note: Trunk negotiation does not work across VTP domains. Refer to the Data Traffic Blocked between VTP Domains section of Troubleshooting VLAN Trunk Protocol (VTP) for more information.

  • All switches in a VTP domain must run the same VTP version.

  • All switches in a VTP domain has the same VTP password, if there is any.

  • All VTP Server switch(es) should have the same configuration revision number and it should also be the highest in the domain.

  • When you move a VTP mode of a switch from Transparent to Server, VLANs configured on the VTP Transparent switch should exist on the Server switch.

VTP Configuration on Catalyst Switches

This section provides some basic commands in order to configure VTP on the most commonly used Catalyst switches.

Note: The Catalyst 2948G-L3 and Catalyst 4908G-L3 Layer 3 (L3) switches do not support several Layer 2 (L2)-oriented protocols that are found on other Catalyst switches. Such protocols include VTP, DTP, and Port Aggregation Protocol (PAgP).

Catalyst 6500/6000 Series Cisco IOS Software/Catalyst 4500/4000 Cisco IOS Software (Supervisor Engine III/Supervisor Engine IV), Catalyst 2950, 3550, and 3750 Series Switches

There are two methods that you can use in order to configure VTP, as this section shows. Method 2 (the global configuration mode method) is not available in earlier software on Catalyst 6500 series switches that run Cisco IOS® Software.

  1. In VLAN database mode:

    In Cisco IOS Software, you can configure the VTP domain name, the VTP mode, and the VLANs in VLAN configuration mode.

    1. In EXEC mode, issue this command in order to enter VLAN configuration mode:

      Router#vlan database
      
      !--- Issue this command in privileged EXEC mode,
      !--- not in global configuration mode.
      
      Router(vlan)#
      
      !--- This is VLAN configuration mode.
      
      
    2. Issue this command in order to set the VTP domain name:

      Router(vlan)#vtp domain domain-name
      
      
    3. Issue this command in order to set the VTP mode:

      Router(vlan)#vtp {client | server | transparent}
      
    4. Issue the exit command in order to exit VLAN configuration mode.

      Note: The end and the Ctrl-Z commands do not work in this mode.

      Router(vlan)#end
      
      Router(vlan)#^Z
      
      % Invalid input detected at '^' marker.
      
      Router(vlan)#
      
      Router(vlan)#exit
      
      APPLY completed.
      Exiting....
      Router#
  2. In global configuration mode:

    In Cisco IOS Software global configuration mode, you can configure all VTP parameters with Cisco IOS Software commands. This is the command format:

    Router(config)#vtp ?
    
    domain     Set the name of the VTP administrative domain.
    file       Configure IFS filesystem file where VTP configuration is stored.
    interface  Configure interface as the preferred source for the VTP IP updater
               address. 
    mode       Configure VTP device mode
    password   Set the password for the VTP administrative domain
    pruning    Set the administrative domain to permit pruning
    version    Set the administrative domain to VTP version
  3. Issue these commands in order to monitor VTP operation and status:

    Router#show vtp status
    
    Router#show vtp counters
    

Catalyst 4500/4000, 5500/5000, or 6500/6000 Series CatOS

Complete these steps:

  1. Issue this command in order to set the domain name:

    set vtp domain name
    
    

    Note: When you configure a new switch, the VTP domain name should be configured before you create any non-default VLANs.

  2. Issue this command in order to set the mode:

    set vtp mode [server | client | transparent]
    
  3. Issue these commands in order to monitor the VTP operation and status:

    show vtp domain
    show vtp statistics
    

Catalyst 2900XL, 3500XL, 2950, and 3550

Complete these steps:

  1. Issue these commands from the VLAN database mode:

    Note: This is similar to the method for Cisco 6500 series switches that run Cisco IOS Software.

    vtp [client | server | transparent]
    vtp domain name
    
    
  2. From enable mode, issue these commands in order to monitor VTP operation:

    show vtp counters
    show vtp status
    

    Note: The Catalyst 2900XL series switches with Cisco IOS Software Release 11.2(8)SA4 and later support VTP protocol. The Cisco IOS Software Release 11.2(8)SA3 and earlier code do not support VTP protocol on Catalyst 2900XL series switches.

Catalyst Express 500 Series Switches

Catalyst Express 500 series switches support only VTP transparent mode. There is currently no support for VTP client or VTP server mode. The user must manually configure all VLANs that are used on the switch.

Open the Switch Management, choose Configure > VLAN > Create, and fill out the available fields in order to configure a VLAN on a Catalyst Express 500 series switch.

Refer to the Create, Modify, and Delete VLANs section of Customization for more information.

Practical Examples

Example 1:

This example involves two Catalyst 4000 switches that are connected by a Fast Ethernet link:

  1. Bing is a new switch that has no VTP domain name and no VLAN. Clic is a switch that currently exists and runs with 12 VLANs in the VTP domain test.

  2. In this sample output from the show vtp domain command, you can see that the VTP version is set at 2. This means that the switch is VTP V2-capable. However, the switch does not run VTP V2 in this case. The switch only runs VTP V2 if the V2 mode is enabled with the set vtp v2 enable command:

    bing (enable) show vtp domain
    
    Domain Name                      Domain Index VTP Version Local Mode  Password
    -------------------------------- ------------ ----------- ----------- ----------
                                       1            2           server      -
    
    Vlan-count Max-vlan-storage Config Revision Notifications
    ---------- ---------------- --------------- -------------
    5          1023             0               disabled
    
    Last Updater    V2 Mode  Pruning  PruneEligible on Vlans
    --------------- -------- -------- -------------------------
    0.0.0.0         disabled disabled 2-1000
    bing (enable)
    
    bing (enable) show vlan
    
    VLAN Name                             Status    IfIndex Mod/Ports, Vlans
    ---- -------------------------------- --------- ------- ------------------------
    1    default                          active    67      2/1-2,2/4-48
                                                            3/1-6
    1002 fddi-default                     active    68
    1003 token-ring-default               active    71
    1004 fddinet-default                  active    69
    1005 trnet-default                    active    70
    
    clic (enable)  show vtp domain
    
    Domain Name                      Domain Index VTP Version Local Mode  Password
    -------------------------------- ------------ ----------- ----------- ----------
    test                             1            2           server      -
    
    Vlan-count Max-vlan-storage Config Revision Notifications
    ---------- ---------------- --------------- -------------
    12         1023             11              disabled
    
    Last Updater    V2 Mode  Pruning  PruneEligible on Vlans
    --------------- -------- -------- -------------------------
    0.0.0.0         disabled disabled 2-1000
    
    clic (enable) show vlan
    
    VLAN Name                             Status    IfIndex Mod/Ports, Vlans
    ---- -------------------------------- --------- ------- ------------------------
    1    default                          active    65      2/1-2,2/4-50
    2    VLAN0002                         active    77
    3    VLAN0003                         active    78      2/3
    4    VLAN0004                         active    79
    5    VLAN0005                         active    73
    6    VLAN0006                         active    74
    7    VLAN0007                         active    76
    10   VLAN0010                         active    80
    1002 fddi-default                     active    66
    1003 token-ring-default               active    69
    1004 fddinet-default                  active    67
    1005 trnet-default                    active    68      68
  3. At this stage, a trunk is created between the two switches. Notice how they synchronize and watch the VTP packet exchange:

    MAC 005014BB63FD is clic
    
    MAC 003019798CFD is bing
  4. Clic sends a summary advertisement to bing. Bing learns the VTP domain name from this packet, in FRAME 1 in this sample output:

    
    !--- On bing:
    
    received vtp packet: mNo = 2 pNo = 1
    VTP: i summary, domain = test, rev = 11, followers = 0
    
    !--- This indicates that bing has received its
    !--- first summary advertisement.
    
    domain change notification sent
    VTP: transitioning from null to test domain
    
    !--- This is where bing gets the VTP domain name.
    
    VTP: summary packet rev 11 greater than domain test rev 0
    VTP: domain test currently not in updating state
    VTP: summary packet with followers field zero
    
    ------------------FRAME 1-----------------------------------
    DLC:  ----- DLC Header -----
          DLC:
          DLC:  Frame 1988 arrived at  15:01:00.1223; frame size is 99 (0063 hex) bytes.
          DLC:  Destination = Multicast 01000CCCCCCC
          DLC:  Source      = Station 005014BB63FD
          DLC:  802.3 length = 85
          DLC:
    LLC:  ----- LLC Header -----
          LLC:
          LLC:  DSAP Address = AA, DSAP IG Bit = 00 (Individual Address)
          LLC:  SSAP Address = AA, SSAP CR Bit = 00 (Command)
          LLC:  Unnumbered frame: UI
          LLC:
    SNAP: ----- SNAP Header -----
          SNAP:
          SNAP: Vendor ID = Cisco1
          SNAP: Type = 2003 (VTP)
          SNAP:
    VTP: ----- Cisco Virtual Trunk Protocol (VTP) Packet -----
          VTP:
          VTP: Version                          = 1
          VTP: Message type                     = 0x01 (Summary-Advert)
          VTP: Number of Subset-Advert messages = 0
          VTP: Length of management domain name = 4
          VTP: Management domain name           = "test"
          VTP: Number of Padding bytes          = 28
          VTP: Configuration revision number    = 0x0000000b
          VTP: Updater Identity IP address      = 0.0.0.0
          VTP: Update Timestamp                 = "930525053753"
          VTP: MD5 Digest value                 = 0x857610862F3015F0
          VTP:                                    0x220A52427247A7A0
    -----------------------------------------------------------
  5. With the trace command set, bing receives a summary advertisement with no followers. Therefore, bing updates its domain name and sends advertisement requests to obtain the VLAN information, in FRAME 2 in this sample output:

    
    !--- On bing:
    
    VTP: tx vtp request, domain test, start value 0
    
    !--- This is where the advertisement request is sent.
    
    ----------------------FRAME 2--------------------------------
    DLC:  ----- DLC Header -----
          DLC:
          DLC:  Frame 1683 arrived at  17:38:55.9383; frame size is 60 (003C hex) bytes.
          DLC:  Destination = Multicast 01000CCCCCCC
          DLC:  Source      = Station 003019798CFD
          DLC:  802.3 length = 46
          DLC:
    LLC:  ----- LLC Header -----
          LLC:
          LLC:  DSAP Address = AA, DSAP IG Bit = 00 (Individual Address)
          LLC:  SSAP Address = AA, SSAP CR Bit = 00 (Command)
          LLC:  Unnumbered frame: UI
          LLC:
    SNAP: ----- SNAP Header -----
          SNAP:
          SNAP: Vendor ID = Cisco1
          SNAP: Type = 2003 (VTP)
          SNAP:
    VTP: ----- Cisco Virtual Trunk Protocol (VTP) Packet -----
          VTP:
          VTP: Version                          = 1
          VTP: Message type                     = 0x03 (Advert-Request)
          VTP: Reserved
          VTP: Length of management domain name = 4
          VTP: Management domain name           = "test"
          VTP: Padding bytes                    = 28
          VTP: Start value                      = 0 (all VLANs)
    --------------------------------------------------------
  6. Clic sends another summary advertisement with field followers to VLAN 1. The subset advertisement that contains all VLANs, in FRAME 3 in this output, follows this packet. Then, bing configures all the VLANs:

    
    !--- On bing:
    
    received vtp packet: mNo = 2 pNo = 1
    VTP: i summary, domain = test, rev = 11, followers = 1
    
    !--- Bing has received its second summary advertisement.
    
    VTP: domain test, current rev = 0 found for summary pkt
    VTP: summary packet rev 11 greater than domain test rev 0
    
    !--- This configuration revision is higher than that on bing.
    
    VTP: domain test currently not in updating state
    received vtp packet: mNo = 2 pNo = 1
    VTP: i subset, domain = test, rev = 11, seq = 1, length = 344
    
    !--- Bing has received its subset advertisement.
    
    VTP: domain test, current rev = 0 found for subset pkt
    domain change notification sent
    vlan 1 unknown tlv change notification sent
    vlan 2 unknown tlv change notification sent
    vtp_vlan_change_notification: vlan = 2, mode = 1
    (ADD,ACTIVE), mNo = 2 pNo = 1 vlan = 2
    vlan 3 unknown tlv change notification sent
    vtp_vlan_change_notification: vlan = 3, mode = 1
    (ADD,ACTIVE), mNo = 2 pNo = 1 vlan = 3
    vlan 4 unknown tlv change notification sent
    vtp_vlan_change_notification: vlan = 4, mode = 1
    (ADD,ACTIVE), mNo = 2 pNo = 1 vlan = 4
    vlan 5 unknown tlv change notification sent
    vtp_vlan_change_notification: vlan = 5, mode = 1
    (ADD,ACTIVE), mNo = 2 pNo = 1 vlan = 5
    vlan 6 unknown tlv change notification sent
    vtp_vlan_change_notification: vlan = 6, mode = 1
    (ADD,ACTIVE), mNo = 2 pNo = 1 vlan = 6
    vlan 7 unknown tlv change notification sent
    vtp_vlan_change_notification: vlan = 7, mode = 1
    (ADD,ACTIVE), mNo = 2 pNo = 1 vlan = 7
    
    -----------------FRAME 3----------------------------------
    DLC:  ----- DLC Header -----
          DLC:
          DLC:  Frame 2008 arrived at  15:01:03.9661; frame size is 99 (0063 hex) bytes.
          DLC:  Destination = Multicast 01000CCCCCCC
          DLC:  Source      = Station 003019798CFD
          DLC:  802.3 length = 85
          DLC:
    LLC:  ----- LLC Header -----
          LLC:
          LLC:  DSAP Address = AA, DSAP IG Bit = 00 (Individual Address)
          LLC:  SSAP Address = AA, SSAP CR Bit = 00 (Command)
          LLC:  Unnumbered frame: UI
          LLC:
    SNAP: ----- SNAP Header -----
          SNAP:
          SNAP: Vendor ID = Cisco1
          SNAP: Type = 2003 (VTP)
          SNAP:
    VTP: ----- Cisco Virtual Trunk Protocol (VTP) Packet -----
          VTP:
          VTP: Version                          = 1
          VTP: Message type                     = 0x01 (Summary-Advert)
          VTP: Number of Subset-Advert messages = 1
    
    !--- Here are the numbers.
    
          VTP: Length of management domain name = 4
          VTP: Management domain name           = "test"
          VTP: Number of Padding bytes          = 28
          VTP: Configuration revision number    = 0x0000000b
          VTP: Updater Identity IP address      = 0.0.0.0
          VTP: Update Timestamp                 = "930525053753"
          VTP: MD5 Digest value                 = 0x857610862F3015F0
          VTP:                                    0x220A52427247A7A0
    
    DLC:  ----- DLC Header -----
          DLC:
          DLC:  Frame 2009 arrived at  15:01:03.9664; frame size is 366 (016E hex) bytes.
          DLC:  Destination = Multicast 01000CCCCCCC
          DLC:  Source      = Station 003019798CFD
          DLC:  802.3 length = 352
          DLC:
    LLC:  ----- LLC Header -----
          LLC:
          LLC:  DSAP Address = AA, DSAP IG Bit = 00 (Individual Address)
          LLC:  SSAP Address = AA, SSAP CR Bit = 00 (Command)
          LLC:  Unnumbered frame: UI
          LLC:
    SNAP: ----- SNAP Header -----
          SNAP:
          SNAP: Vendor ID = Cisco1
          SNAP: Type = 2003 (VTP)
          SNAP:
    VTP: ----- Cisco Virtual Trunk Protocol (VTP) Packet -----
          VTP:
          VTP: Version                          = 1
          VTP: Message type                     = 0x02 (Subset-Advert)
          VTP: Sequence number                  = 1
          VTP: Management Domain Name length    = 4
          VTP: Management Domain Name           = "test"
          VTP: Number of Padding bytes          = 28
          VTP: Configuration revision number    = 0x0000000b
          VTP:
          VTP: VLAN Information Field # 1:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 7
          VTP: ISL VLAN-id                      = 1
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100001
          VTP: VLAN Name                        = "default"
          VTP: # padding bytes in VLAN Name     = 1
          VTP:
          VTP: VLAN Information Field # 2:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 2
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100002
          VTP: VLAN Name                        = "VLAN0002"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 3:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 3
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100003
          VTP: VLAN Name                        = "VLAN0003"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 4:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 4
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100004
          VTP: VLAN Name                        = "VLAN0004"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 5:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 5
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100005
          VTP: VLAN Name                        = "VLAN0005"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 6:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 6
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100006
          VTP: VLAN Name                        = "VLAN0006"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 7:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 7
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100007
          VTP: VLAN Name                        = "VLAN0007"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 8:
          VTP: VLAN information field length    = 20
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 1 (Ethernet)
          VTP: Length of VLAN name              = 8
          VTP: ISL VLAN-id                      = 10
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 100010
          VTP: VLAN Name                        = "VLAN0010"
          VTP: # padding bytes in VLAN Name     = 0
          VTP:
          VTP: VLAN Information Field # 9:
          VTP: VLAN information field length    = 32
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 2 (FDDI)
          VTP: Length of VLAN name              = 12
          VTP: ISL VLAN-id                      = 1002
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 101002
          VTP: VLAN Name                        = "fddi-default"
          VTP: # padding bytes in VLAN Name     = 0
          VTP: Reserved 8 bytes
          VTP:
          VTP: VLAN Information Field # 10:
          VTP: VLAN information field length    = 40
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 3 (Token-Ring)
          VTP: Length of VLAN name              = 18
          VTP: ISL VLAN-id                      = 1003
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 101003
          VTP: VLAN Name                        = "token-ring-default"
          VTP: # padding bytes in VLAN Name     = 2
          VTP: Reserved 8 bytes
          VTP:
          VTP: VLAN Information Field # 11:
          VTP: VLAN information field length    = 36
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 4 (FDDI-Net)
          VTP: Length of VLAN name              = 15
          VTP: ISL VLAN-id                      = 1004
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 101004
          VTP: VLAN Name                        = "fddinet-default"
          VTP: # padding bytes in VLAN Name     = 1
          VTP: Reserved 8 bytes
          VTP:
          VTP: VLAN Information Field # 12:
          VTP: VLAN information field length    = 36
          VTP: VLAN Status                      = 00 (Operational)
          VTP: VLAN type                        = 5 (TR-Net)
          VTP: Length of VLAN name              = 13
          VTP: ISL VLAN-id                      = 1005
          VTP: MTU size                         = 1500
          VTP: 802.10 SAID field                = 101005
          VTP: VLAN Name                        = "trnet-default"
          VTP: # padding bytes in VLAN Name     = 3
          VTP: Reserved 8 bytes
    ----------------------------------------------------------------
  7. At this point, both switches are synchronized:

    bing (enable) show vtp domain
    
    Domain Name                      Domain Index VTP Version Local Mode  Password
    ------------------------------- ------------ ----------- ----------- ----------
    test                             1            2           server      -
    
    Vlan-count Max-vlan-storage Config Revision Notifications
    ---------- ---------------- --------------- -------------
    12         1023             11              disabled
    
    Last Updater    V2 Mode  Pruning  PruneEligible on Vlans
    --------------- -------- -------- -------------------------
    0.0.0.0         disabled disabled 2-1000
    
    bing (enable) show vlan
    
    VLAN Name                             Status    IfIndex Mod/Ports, Vlans
    ---- -------------------------------- --------- ------- ------------------------
    1    default                          active    127     2/2-48
                                                            3/1-6
    2    VLAN0002                         active    132
    3    VLAN0003                         active    133
    4    VLAN0004                         active    134
    5    VLAN0005                         active    135
    6    VLAN0006                         active    136
    7    VLAN0007                         active    137
    10   VLAN0010                         active    138
    1002 fddi-default                     active    128
    1003 token-ring-default               active    131
    1004 fddinet-default                  active    129
    1005 trnet-default                    active    130

Example 2:

This example shows how to verify the VTP configuration on a Catalyst 6000 that runs Cisco IOS Software:

Router#show vtp status

VTP Version:                        2
Configuration Revision:           247
Maximum VLANs supported locally: 1005
Number of existing VLANs:          33
VTP Operating Mode:            Client
VTP Domain Name:          Lab_Network
VTP Pruning Mode:             Enabled
VTP V2 Mode:                 Disabled
VTP Traps Generation:        Disabled
MD5 digest: 0x45 0x52 0xB6 0xFD 0x63 0xC8 0x49 0x80
Configuration last modified by 0.0.0.0 at 8-12-99 15:04:49
Router#

Example 3:

This example shows how to display VTP statistics on a Catalyst 6000 that runs Cisco IOS Software:

Router#show vtp counters

VTP statistics:
Summary advertisements received: 7
Subset advertisements received: 5
Request advertisements received: 0
Summary advertisements transmitted: 997
Subset advertisements transmitted: 13
Request advertisements transmitted: 3
Number of config revision errors: 0
Number of config digest errors: 0
Number of V1 summary errors: 0
VTP pruning statistics:

Trunk            Join Transmitted Join Received    Summary advts received
                                                   from on-pruning-capable device
---------------- ---------------- ---------------- ---------------------------
Fa5/8             43071            42766            5

Troubleshoot VTP

Refer to Troubleshooting VLAN Trunk Protocol (VTP) for information to troubleshoot VTP.

Related Information

Updated: Nov 29, 2011
Document ID: 98154