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VTP and STP questions.

 
 
shrike@cyberspace.org
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      06-14-2006
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

 
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SAto
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      06-15-2006

http://www.velocityreviews.com/forums/(E-Mail Removed) 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

 
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Siva
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      06-15-2006
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

(E-Mail Removed) 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


 
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BernieM
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      06-15-2006

<(E-Mail Removed)> wrote in message
news:(E-Mail Removed) oups.com...
> 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/tk38...80094c52.shtml

See notes under "Use VTP in a Network"

BernieM


 
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