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  1. Junior Member
    Join Date
    May 2016
    Posts
    20

    Certifications
    A+ Network+
    #1

    Default VTP pruning enabled, but can still see broadcasts

    hi all,

    I'm trying to lab the VTP prunning cmd in GNS3. what i'm having trouble with is after enabling vtp prunning, wirehsark can still see broadcast packets in links that shouldn't have.

    my setup is simple:
    Sw1----Sw2----Sw3
    vtp mode server
    vtp domain bob
    vtp prunning
    vlan 12
    vlan 23
    all VLANs propagate all good.

    on Sw1:
    int vlan 12 with addr 12.12.12.1/24

    on Sw2:
    int vlan 12 with addr 12.12.12.2/24
    int vlan 23 with addr 23.23.23.2/24

    on Sw3
    int vlan 23 with addr 23.23.23.3/24



    my understanding is with vtp prunning, vlan 12 flooded traffic should only be on Sw 1 & 2, and vlan 23's should only be on Sw 2 & 3.

    but from Sw1, when I ping 12.12.12.99 (which should ARP broadcast in vlan 12 only), wireshark can still see those broadcasts between Sw 2 & 3.

    and if I run no vtp prunning, and ping again, I see the exact same ARP broadcasts between Sw 2 & 3.

    so I don't know what's changed running vtp prunning or not, except under show int trunk the pruned list of Vlans seem to change.

    What's going on??

    Thanks for reading.
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  3. Junior Member
    Join Date
    May 2017
    Posts
    21

    Certifications
    CCENT , CCNA:R&S
    #2
    Hey,
    As far as I know, GNS3 does no support switches.
    I recommend using different software to practice VTP (Packet Tracer)
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  4. Senior Member
    Join Date
    Jul 2016
    Posts
    313

    Certifications
    CCNA R&S
    #3
    Your a few years out of date

    With the right images it is exactly the same as VIRL

    Quote Originally Posted by trac0de View Post
    Hey,
    As far as I know, GNS3 does no support switches.
    I recommend using different software to practice VTP (Packet Tracer)
    Reply With Quote Quote  

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