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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.

VTP_Topology.jpg

Question 1

Explanation

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:

Sw1_show_vtp_status.jpg

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

Explanation

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

Sw1_show_interfaces_trunk.jpg

Sw2_show_interfaces_trunk.jpg

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

Explanation

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

Explanation

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.”

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  1. Anonymous
    February 15th, 2018

    Where are the questions of this choices please ?

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  3. 1WAY
    February 20th, 2018

    Q3 & 4 are nasty! Cisco always seems to throw a curve ball in one of the lab questions.

    I’m no expert but I think:

    Q3 is B. ‘Configure VLAN 500 & VLAN 600 on SW1 only’. This is VTPv3 and SW1 is the primary server.

    Q4 is A. ‘Disable VTP pruning on SW1 only’. VTP Pruning is not compatible with PVLANs in VTPv3 (see below link). You can create PVLANs in server mode as well as Transparent mode in VTPv3, so it makes sense to create them on the primary server, SW1, where they will be propagated to SW4 and not have to change any of the switches to Transparent mode.

    https://supportforums.cisco.com/t5/lan-switching-and-routing/pvlan-not-compatible-with-vtpv3-pruning/td-p/1757234

  4. 1WAY
    February 22nd, 2018

    I took the exam today and passed. I had this sim and am still none the wiser to whether Q3 or Q4 where correct.

    In the sim SW1 and SW2 where both VTPv3 Servers for VLANs (not Primary) and Transparent for MST. Both SW1 and SW2 had a Primary Description of SW1 but the Primary Device ID given did not exist on any of the switches. SW4 was set to ‘Client’

    I made the assumption that is SW1 & 2 where Transparent for MST then the answer to Q3 was A ‘Configure VLAN 500 & 600 on both SW1 & SW2’

    As SW1 and SW2 where both VTPv3 Servers for VLANs (not Primary) I made the assumption that the “best” answer to Q4 was A ‘Disable VTP pruning on SW1 only’.

    I may not be right but hopefully it might shed more light on the question for others!

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    February 22nd, 2018

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  6. Good question from Lunchi.
    February 22nd, 2018

    @1WAY how you answered the questions 3 and 4? Do you received a complete score for those questions?

  7. 1WAY
    February 23rd, 2018

    @Good question from Lunchi,

    I answered as stated in my previous reply. Scoring is not detailed enough to tell you whether you are right or wrong on any one question, It’s given as percentages in two categories. I don’t know If I was right or wrong?

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    February 24th, 2018

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    March 3rd, 2018

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  14. ldmkt
    March 4th, 2018

    VTP3 feature have primary and secondary servers. A primary server take control of domain. Secondary servers are as a client. According the picture answer is B.

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  18. angel87
    March 18th, 2018

    Look on post from 1WAY February 20th, 2018

    “Q3 is B. ‘Configure VLAN 500 & VLAN 600 on SW1 only’. This is VTPv3 and SW1 is the primary server.” If you try to create Vlan on SW2 you will see:
    “Sw2(config)#vlan 501
    VTP VLAN configuration not allowed when device is not the primary server for vlan database.”

    “Q4 is A. ‘Disable VTP pruning on SW1 only’.”
    If you try to configure private-vlan on VTPv3 with enabled pruning you will see:
    “Sw1(config)#vlan 300
    Sw1(config-vlan)#private-vlan primary
    %Private VLANs can only be configured when VTP is in transparent/off modes in VTP version 1 or 2 and in server/transparent/off modes in VTP version 3 when pruning is turned off”

  19. Anonymous
    April 3rd, 2018

    angel87 what IOS and platform have you tried these, I’m testing vtp v3 on 3750 Version 12.2(55)SE12 and I’m able to create private vlans with pruning mode enabled

    VTP Domain Name : CCNP
    VTP Pruning Mode : Enabled
    VTP Traps Generation : Disabled
    Device ID : 0817.35a5.2200

    Feature VLAN:
    ————–
    VTP Operating Mode : Primary Server

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    April 6th, 2018

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  21. Grishazahid
    April 20th, 2018

    About Question 3
    In VTP v3 You can add new vlans only from Primary Server
    By default in vtp v3 if you enter
    Switch(config)#vtp mode server
    switch will be operating as secondary server
    So you need to enter
    Switch#vtp primary vlan
    to make the switch primary and unlock creating new vlans feature

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    April 21st, 2018

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  23. Tacobell
    April 28th, 2018

    @Certprepare: about question 4. I think the answer is A. Since SW4 is on client mode, it is a “slave” of the SW1-Server, if on SW4 you disable pruning (which implies transparent mode) then you create the private-vlan. The problem is when you put SW4 back on the VTP domain as Client, the config will be overidden by SW1, deleting the private-vlan… What do you think?

  24. ROMEO
    May 7th, 2018

    @Certprepare:
    About Question 4, i agree with @1Way and @Tacobell. In VTP version 3, (only) a specific device in a domain, (a primary server is allowed to update other devices).

    Here is the reference from Cisco:
    https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/solution_guide_c78_508010.html

  25. ROMEO
    May 7th, 2018

    @Certprepare:
    Sorry i meant Question 3 not 4

  26. ROMEO
    May 7th, 2018

    Question is:
    You are adding new VLANs: VLAN500 and VLAN600 to the topology in such way that you need to configure SW1 as primary root for VLAN 500 and secondary for VLAN 600 and SW2 as primary root for VLAN 600 and secondary for VLAN 500. Which configuration step is valid?

    Correct Answer (B):
    Configure VLAN 500 and VLAN 600 on SW1 only.

    Reason:
    Because SW1 is a primary server, and according to Cisco, only a primary server can update other devices.

  27. Anonymous
    May 11th, 2018

    I agree with Romeo, see definition for VTP version 3 primary server, “VTP primary server: only the primary server is able to create / modify / delete VLANs.” So with that definition we would only need to configure vlan 500 & 600 on SW1

  28. Anonymous
    May 11th, 2018

    But reading the question, it is NOT asking for SW1 to be the primary for vlan 600 AND 500, only for one of them. So you would need to create one vlan on SW2 and using the primary vlan command on SW2, Im divided on this

  29. tacacs
    May 12th, 2018

    I agree with Romeo too.
    Q: You are adding new VLANs: VLAN500 and VLAN600 to the topology blahblah
    From my point of view: 2 steps asked, where only the first can be answered.
    Create VLAN ( VTP Topic ) => Question
    Change STP Roots (STP Topic ) => only to make some confusion

    (B) should be the correct answer, use only the Primary Server to add VLANs

  30. Rosso
    May 22nd, 2018

    I’m confused about question:

    Question 3

    You are adding new VLANs: VLAN500 and VLAN600 to the topology in such way that you need to configure SW1 as primary root for VLAN 500 and secondary for VLAN 600 and SW2 as primary root for VLAN 600 and secondary for VLAN 500. Which configuration step is valid?
    A. Configure VLAN 500 & VLAN 600 on both SW1 & SW2
    B. Configure VLAN 500 and VLAN 600 on SW1 only
    C. Configure VLAN 500 and VLAN 600 on SW2 only
    D. Configure VLAN 500 and VLAN 600 on SW1 ,SW2 and SW4
    E. On SW2 configure VTP mode as off and configure VLAN 500 and VLAN 600; configure back to vtp server mode.

    Why is it A, As per cisco documentation you can only make changes on the primary server for VTP version 3.

    Answer must be B. Configure VLAN 500 and VLAN 600 on SW1 only

  31. Mbote Lajoie
    May 22nd, 2018

    @Rosso

    Regarding the Question 3 i think the Answer A is right.

    Why ?

    Because the statement said
    ” we need to to configure SW1 as primary root for VLAN 500 and secondary for VLAN 600 and SW2 as primary root for VLAN 600 and secondary for VLAN 500″

    we means 2 steps : creating the Vlans and configuring the Primary Root for each.

    Creating a VLAN on the Primary Server is not enough to complete the task.

    just my point of view!!!

  32. Rosso
    May 23rd, 2018

    @Mbote Lajoie

    You are right however analyze the question: WHICH configuration ((((STEP)))) is VALID?

    If you check the possible answer, they never mention anything about spanning-tree. They are ONLY giving you 5 options to configure VLANs and nothing related to configure primary or secondary root.

    So as you know, if you need to CONFIGURE new Vlans, In vtp v3 this can only be performed on the VTP primary server.

  33. Ahmed B.
    May 25th, 2018

    Regarding VTPv3 Lab question 3
    =========================
    I guess that answer B is the correct , we have to configure the vlans on SW1 only bcoz its the PRIMARY SERVER in VTPv3,
    you cant add or delete vlans from any other switch even it was a Server

    I know that the question header is talking about having primary & secondary roots , which really needs you to make configuration on SW2 like the below :

    SW2(config)#spanning-tree vlan 600 root primary
    SW2(config)#spanning-tree vlan 500 root secondary

    HOWEVER, in the question header it says “Which configuration step is valid?”

    so he mentioned all the above story and in the end is asking about “a step” to achieve the request which is creating the vlans first which could be done ONLY from the Primary server in VTP3

  34. Unknown
    June 4th, 2018

    In regards to Question 2 (VTPv3 Lab)
    =======================
    If you cannot remember the “show interfaces trunk” command, you can always try to use “sh run”, which works on the sims here (not sure if it will work in the exam).
    When you run the command, you can see the “switchport trunk native vlan 99” line under “interface Ethernet2/2” and “interface Ethernet2/3” for each of the routers (R1 and R2).

  35. Raito
    June 8th, 2018

    Q3:

    1Way is right, the correct answer is B. I set up a GNS3 lab and tested adding a VLAN while in VTPv3 server mode. As you can see, only the primary server and not a secondary server is allowed to add VLANs:

    SW1(config)#do sh vtp status
    VTP Version capable : 1 to 3
    VTP version running : 3
    VTP Domain Name : CCNP
    VTP Pruning Mode : Disabled
    VTP Traps Generation : Disabled
    Device ID : aabb.cc80.0400

    Feature VLAN:
    ————–
    VTP Operating Mode : Server
    Number of existing VLANs : 5
    Number of existing extended VLANs : 0
    Maximum VLANs supported locally : 4096
    Configuration Revision : 0
    Primary ID : 0000.0000.0000
    Primary Description :
    MD5 digest :

    Feature MST:
    ————–
    VTP Operating Mode : Transparent

    Feature UNKNOWN:
    ————–
    VTP Operating Mode : Transparent

    SW1(config)#vlan 200
    VTP VLAN configuration not allowed when device is not the primary server for vlan database.

  36. 2/3 CCNP
    June 8th, 2018

    Just passed with an 881. This SIM is still 100% accurate.

  37. caza00
    June 21st, 2018

    it must be “B” or whatever switch shows to be the Primary Server. If you read the Cisco documentation it says the following:

    VTP primary server and VTP secondary servers. A VTP primary server updates the database information and sends updates that are honored by all devices in the system. A VTP secondary server can only back up the updated VTP configurations received from the primary server to its NVRAM.

    By default, all devices come up as secondary servers. You can enter the vtp primary privileged EXEC command to specify a primary server. Primary server status is only needed for database

    So in this case, Switch 1 (SW1) should have been configured explicitely as Primary Server, thus only new VLANs can be added on that switch.

    Ref:
    https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_52_se/configuration/guide/3750scg/swvtp.html#wp1035044

  38. CMA91
    June 24th, 2018

    Hi.. gys i just want to set up my own lab for doing the practicals related to ccna switching basically

    HSRP,VRRP, VLAN access map, dhcp snooping, etc. so can you just help me to find a layer 3 switch which supports all these features and can be used in GNS3 ?

  39. CMA91
    June 24th, 2018

    Actually not for ccna it is for the CCNP switching practicals

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