VTP and STP questions.

Discussion in 'Cisco' started by shrike@cyberspace.org, Jun 14, 2006.

  1. Guest

    Howdy,

    Do VTP domains between 2 switches have to be the same for the trunk to
    come up?

    How do you identify which switch is root in a VLAN from a switch that
    isn't?

    Took the CCNA test today. Missed it by one question.

    -Thanks!
    -Matt
     
    , Jun 14, 2006
    #1
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  2. SAto Guest

    skrev:
    > Howdy,
    >
    > Do VTP domains between 2 switches have to be the same for the trunk to
    > come up?


    No, the trunk should come up withouth the "benefit" of VTP though

    > How do you identify which switch is root in a VLAN from a switch that
    > isn't?


    sh spanning-tree vlan "vlanid"

    output looks like this:

    VLAN #
    Spanning tree enabled protocol rstp
    Root ID Priority 8192
    Address 0006.5342.9600
    Cost 19
    Port 25 (FastEthernet0/23)
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

    Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
    Address 0013.c3bc.0080
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
    Aging Time 300

    Root ID gives the mac address of the root bridge and Bridge ID is the
    switch you are currently managing.

    -SAto
     
    SAto, Jun 15, 2006
    #2
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  3. Siva Guest

    If you want the trunk to be up, you need to manually configure the
    ports in on mode because negogiations won't happen across different vtp
    domains. Reg the second Q, execute show spantree <vlan-id> in cat os
    and show spanning-tree vlan <vlan-d> in cat ios to get the spanning
    tree details of the vlan. Here, if the root id address and bridge id
    address are same or if the cost is 0 , then this switch is the root.

    ~ Siva

    wrote:
    > Howdy,
    >
    > Do VTP domains between 2 switches have to be the same for the trunk to
    > come up?
    >
    > How do you identify which switch is root in a VLAN from a switch that
    > isn't?
    >
    > Took the CCNA test today. Missed it by one question.
    >
    > -Thanks!
    > -Matt
     
    Siva, Jun 15, 2006
    #3
  4. BernieM Guest

    <> wrote in message
    news:...
    > Howdy,
    >
    > Do VTP domains between 2 switches have to be the same for the trunk to
    > come up?
    >
    > How do you identify which switch is root in a VLAN from a switch that
    > isn't?
    >
    > Took the CCNA test today. Missed it by one question.
    >
    > -Thanks!
    > -Matt
    >


    Yes if you are using DTP.

    http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml

    See notes under "Use VTP in a Network"

    BernieM
     
    BernieM, Jun 15, 2006
    #4
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