From: itsfortarget iwillgetit (itsfortarget@gmail.com)
Date: Sat Mar 21 2009 - 09:08:48 ART
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.
Blogs and organic groups at http://www.ccie.net
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