Re: DTP

Hello Team:

switchport nonegotiate
Use the switchport nonegotiate interface configuration command to
specify that Dynamic Trunking Protocol (DTP) negotiation packets are
not sent on the Layer 2 interface. The switch does not engage in DTP
negotiation on this interface. Use the no form of this command to
return to the default setting.

switchport nonegotiate

no switchport nonegotiate

http://www.cisco.com/en/US/products/hw/switches/ps5528/prod_command_reference_list.html

Regards,
John

On 8/30/12, Gilles Fabre <fabre.gilles_at_voila.fr> wrote:
> well, actually I think I didn't use the right terms sorry
> DTP is more a send/receive than a request/reply protocol
>
> so I would say that
> B configuring switchport mode access or switchport mode trunk stops the
> processing of received dtp frames
> B configuring switchport nonegociate stops sending DTP frames
>
> do you agree ?
>
>
>
>> Message du 30/08/12 C 16h55
>> De : "Tim Cribbs Jr."
>> A : "Gilles Fabre"
>> Copie C : "Cisco certification"
>> Objet : Re: DTP
>>
>> From the reference, it says the "switchport nonegotiate" command will
>> not send DTP packets out the interface (vice stopping the reply).
>> Would it do both? Or would it reply to requests but just not send?
>>
>> "When you enter the switchport nonegotiate command, DTP negotiation
>> packets are not sent on the interface. The device does or does not
>> trunk according to the mode parameter: access or trunk."
>>
>>
> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12
> .2_25_se/command/reference/cli3.html#wp1989134
>>
>> -Tim
>>
>> On Thu, Aug 30, 2012 at 9:55 AM, Gilles Fabre wrote:
>> > Good explanation, thanks for reminding
>> >
>> > In my opinion, it is important to remember is that "switchport
> nonegociate"
>> > command doesn't stop the local device using DTP, but instead it stops
>> > the
>> > reply to a DTP request (& so a remote device won't be able to negociate
>> > a
>> > trunk if the local device is set to "nonegociate")
>> >
>> > If you want your local interface not to negociate, just force to
> "switchport
>> > mode access" or "switchport mode trunk"
>> >
>> > Hope this helps
>> > Gilles.
>> >
>> >
>> >
>> >> Message du 30/08/12 C 10h11
>> >> De : "Anthony Sequeira"
>> >> A : "dmp7515" , ccielab_at_groupstudy.com
>> >> Copie C :
>> >> Objet : Re: DTP
>> >>
>> >> As I recall, according to Cisco, switchport nonegotiate is only
>> >> appropriate in two configurations:
>> >>
>> >> switchport mode access
>> >> and
>> >> switchport mode trunk
>> >>
>> >> So if you try and get crazy and apply it to each link in your example
>> >> B
> -
>> >> you should get a big batch of nothing as a result :-).
>> >>
>> >> Here is the documentation quote and link "This command is valid only
> when
>> >> the interface switchport mode is access or trunk (configured by using
> the
>> >> switchport mode access or the switchport mode trunk interface
>> >> configuration command). This command returns an error if you attempt
>> >> to
>> >> execute it in dynamic (auto or desirable) mode."
>> >>
>> >>
> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/
>> >> 12.2_25_se/command/reference/cli3.html#wp1989134
>> >>
>> >> Anthony Sequeira, CCIE, CCSI, VCP
>> >> http://www.stormwind.com
>> >> Twitter: @compsolv
>> >> Facebook: http://www.facebook.com/compsolv
>> >>
>> >>
>> >>
>> >> On 8/29/12 11:45 PM, "dmp7515" wrote:
>> >>
>> >> >Q. of the 4 scenarios, which configuration/s can you apply switchport
>> >> >nonegatiate to disable DTP based on the supplied switchport mode
> setting
>> >> >
>> >> >
>> >> >
>> >> >A. SW1/desirable -> Sw2/Auto
>> >> >
>> >> >B. SW1/Auto -> SW2/Trunk
>> >> >
>> >> >C. SW1/Trunk -> Sw2/Trunk
>> >> >
>> >> >d. SW1/Access -> SW2/Trunk
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >In my efforts to not overlook the most obvious, which I did, I
>> >> > thought
> I
>> >> >would post this to the group J
>> >> >
>> >> >
>> >> >Blogs and organic groups at http://www.ccie.net
>> >> >
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>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> >
>> > Quand Jean-Luc Delarue parlait de son grand amourb& C lire surB
>> > Voila.fr
>> > ___________________________________________________________
>> > Quand Jean-Luc Delarue parlait de son grand amourb& C lire sur Voila.fr
>> >
> http://people.voila.fr/people/actu-stars/personnalites/quand-jean-luc-delarue
>> > -parlait-d-anissa-kehl-son-grand-amour-people_8397.html
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
>> > Subscription information may be found at:
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>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
>
> ___________________________________________________________
> Quand Jean-Luc Delarue parlait de son grand amourb& C lire sur Voila.fr
> http://people.voila.fr/people/actu-stars/personnalites/quand-jean-luc-delarue
> -parlait-d-anissa-kehl-son-grand-amour-people_8397.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
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Received on Thu Aug 30 2012 - 13:34:35 ART