Re: VTP and DTP

From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Sat Mar 21 2009 - 18:07:54 ART

Guys,
I assume you are studying for the test, right ? So how come none has
gone and TEST it to see what happens with at least some version of IOS
in some switch architecture ? That will put an end to it, as far as
"this can/can not work" and go into the more real "this could/could not
work" :)

Should be a 15 min test, or am I missing something ?

-Carlos

itsfortarget iwillgetit @ 21/03/2009 9:08 -0200 dixit:
> Hi,
> But if the VTP domain name is deferent on SW1 and SW2 , the Trunk never
> comes up untill you disable DTP.That means that DTP and VTP is related in
> some manner.
>
> On Sat, Mar 21, 2009 at 2:38 PM, prateek reddy <prateek.reddyk@gmail.com>wrote:
>
>> Hi,
>>
>> VTP " Vlan Trunking protocol " jus replicates the Vlan database between
>> the switches of same domain, and propagates only through trunk links.
>>
>> Where as DTP " Dynamic Trunking Protocol " places a major role in
>> negoiating the states of the links like desirable, auto etc.., and plays a
>> key role in establishing trunks after negoiating.
>>
>> So it is through DTP the negoiation of trunk link happens.
>>
>> Instead we can hardcode that with the command "switchport mode trunk" but
>> still DTP is active. For DTP to stop negoiation we have enter the command "
>> switchport nonnegotiate " . This will stop DTP.
>>
>> so, let assume we have SW1 and SW2 has two links b/w each other on ports
>> fa 0/21 & fa 0/22 on both the switches.
>>
>> *if the configuration is as follows on both interfaces fa 0/21 & fa 0/22
>> of SW1 and SW2
>>
>> switchport trunk encapsulation dot1q
>> switchport mode trunk
>> switchport nonegotiate
>>
>> still fa 0/21 and fa 0/22 will be trunks, and DTP is truned of, on those
>> links...
>>
>> even then VTP can propogate from SW1 to SW2 through these trunk links...
>>
>> so VTP is independent of DTP.*
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Sat, Mar 21, 2009 at 4:14 PM, itsfortarget iwillgetit <
>> itsfortarget@gmail.com> wrote:
>>
>>> Dear Experts,
>>> Please let me know is there any correlation between DTP and VTP. If DTP
>>> is disabled will |VTP packet propagated among the switches ?
>>>
>>>
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>>
>> --
>> With Regards,
>> K.V.Madhu Prateek Reddy.
>
>
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-- 
Carlos G Mendioroz  <tron@huapi.ba.ar>  LW7 EQI  Argentina

Blogs and organic groups at http://www.ccie.net

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