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VTPv3 Sim

February 11th, 2017 in Lab Sim Go to comments

You have been asked to install and configure a new switch in a customer network. Use the console access to the existing and new switches to configure and verify correct device configuration.


Question 1


To comply with the configuration of other switches, we need to get VTP configuration of Sw1 or Sw2. On Sw1 use the “show vtp status” command:


From this output we learn on Sw1:
+ VTP is running version 3
+ VTP Domain is “CCNP”
+ Sw1 is the VTP Primary Server (we will explain about Primary Server later. Now just understand it is in VTP Server mode)

So on the New_Switch, the VTP Domain must match. New_Switch should run VTP version 3 if if can (but it is not a must as VTP version 2 is compatible with VTP version 3). The New_Switch is connecting to hosts so it is in Access Layer so it should be configured as a VTP Client (although Transparent mode is acceptable) so there are only two suitable choices D & E.

From the exhibit, the New_Switch is connecting to a host in VLAN 100 so its E0/0 interface should be in VLAN 100 -> only D is correct.

Question 2


On Sw1 & Sw2 we can check with the “show interfaces trunk” command:



Sw1 & Sw2 are connected through E2/3 & E2/3 so we can see the native Vlan on these trunks are 99. We should check both Sw1 & Sw2 to see if the Native Vlan on both sides match.

Question 3


Use the “show vtp status” on SW1 and SW2 we notice both of them are in “Server” mode so we should choose: A. Configure VLAN 500 & VLAN 600 on both SW1 & SW2.

In practical we only need to create VLANs on one of the “Server” switch and these VLANs will be propagated automatically to others “Server” and “Client” switch. But maybe it is not the answer Cisco wants (as it makes both answers B & C are correct).

Question 4


To configure private VLAN we have to change VTP (even version 3) to Transparent mode. In fact, to disable VTP pruning on Sw4 (in Client mode) we also have to change to VTP Transparent mode so answer C can be understood as “change SW4 to Transparent mode” so it is the best choice.

Note: Unlike VTP version 1 and 2 in which VTP pruning is enabled on VTP Server only, VTP version 3 requires VTP pruning must be enabled on all the switches in the VTP domain so we can also disable VTP pruning on each switch separately. Here is the link for your reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swvtp.html

“With VTP versions 1 and 2, when you enable pruning on the VTP server, it is enabled for the entire VTP domain. In VTP version 3, you must manually enable pruning on each switch in the domain.”

Comment pages
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  1. blah
    August 14th, 2018

    Disable VTP pruning on SW4 only is correct i believe

  2. RED1
    August 16th, 2018

    When using ftp V3, the pruning is to be disabled manually on every with in the network unlike with vtp V2, when the ftp pruning is enabled on the ftp server, it is enabled on all swathes which are not on transparent mode in the entire domain.
    Disable pruning manually on Switch 4 means doing it manually with the command: switch port trunk allowed clan (clan-list)

  3. RED1
    August 16th, 2018

    VTP not FTP

  4. RED1
    August 16th, 2018

    I passed today successfully

    I had been asked by the VTP V3 Sim

    I suggest you the command:
    show ftp devices
    on SW2 and Switch4
    in order to be sure that the SW1 is primary
    I had unfortunately 50% on VTP
    I suppose that because I answered bad the Question 3 and 4.
    Q.3 I answered, Only SW1, I think that the good answer is SW1 and SW2
    Q.4 I answered disable ftp pruning only on SW4, I think that the good response is on SW4 and new switch
    Because in VTP V3 pruning is to be enabled on every switch, unlike in VTP v2, if ftp pruning is in VTP server, so it is enabled in the entire ftp domain.

    50% I think that because I answered good the two first questions.

  5. RED1
    August 16th, 2018

    Sorry: Comand : show vtp devices

  6. confusement
    August 25th, 2018

    from cisco web
    ” In VTP version 3, you must manually enable pruning on each switch in the domain.”

    q4 this means only on SW4 then right?

    August 29th, 2018

    Q4 is Incorrect.

    You need to disable VTP Pruning on the VTPv3 Primary switch (SW1) because when you create a Private VLAN on SW1 while pruning is enabled you get this error :

    (config)#vlan 100
    (config-vlan)#private-vlan primary
    %Private VLANs can only be configured when VTP is in transparent/off modes in VTP v ersion 1 or 2 and in server/transparent/off modes in VTP version 3 when pruning is turned off

    As SW1 is the Primary VTPv3 server, disabling pruning on that device means that you can create the Private Vlan there and have VTP update SW4 with the Private VLAN info. Due to SW1 and 4 being directly connected, the VLAN will not be pruned on SW4 as it is active on the SW1 side of the trunk.

    August 29th, 2018

    Q3 is Incorrect.

    SW1 is the Primary VTP Server and SW2 is only a server within the domain. VTPv3 only allows the Primary server to create VLANs.

    SW1# sh vtp status | i version | Mode
    VTP version running : 3
    VTP Pruning Mode : Enabled
    VTP Operating Mode : Primary Server

    SW2# sh vtp status | i version | Mode
    VTP version running : 3
    VTP Pruning Mode : Enabled
    VTP Operating Mode : Server

    If you attempted to actually create a vlan on SW2 you would see this error :

    SW2(config)#vlan 500
    VTP VLAN configuration not allowed when device is not the primary server for vlan database.

  9. thank you
    August 30th, 2018

    Tnx Warning you are awesome!!

  10. Exile
    September 6th, 2018

    So guys any ide what is the real correct answer on the exam for Q3 and Q4? I mean the answer that cisco actually accepts as correct.

  11. Anonymous
    September 18th, 2018

    Q4 previous statement is correct, must disable vtp pruning to create private VLANs also in primary switch SW1. Answer should be A

  12. MG
    September 19th, 2018

    I think Q3 Answer should be B as only primary switch can add VLANs

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