VTP and STP questions.


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.



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snipped-for-privacy@cyberspace.org skrev:

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

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.


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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 in cat os and show spanning-tree vlan 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

snipped-for-privacy@cyberspace.org wrote:

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Yes if you are using DTP.

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See notes under "Use VTP in a Network"


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