From: Gary Ring (garyring.work@gmail.com)
Date: Thu Jan 19 2006 - 01:13:18 GMT-3
Good catch Anthony. It's like you just got your CCIE or something ;-) It's
right there in the command reference. I saw it as soon as I read your
post. Staring me in the face. Would the port still listen for DTP frames
in trunk mode? Thanks.
Gary Ring
On 1/18/06, Anthony Sequeira <terry.francona@gmail.com> wrote:
>
> You will find many threads on this in the archives - but here is the
> short answer -
>
> You need to set the interfaces to either trunk mode or access mode -
> AND THEN - you need to use the switchport nonegotiate command. For
> some reason - everyone seemed to forget that here in this thread!
>
> Here is a DOC-CD snippet -
>
> switchport nonegotiate - Prevents the interface from generating DTP
> frames. You can use this command only when the interface switchport
> mode is access or trunk. You must manually configure the neighboring
> interface as a trunk interface to establish a trunk link.
>
> On 1/18/06, Gary Ring <garyring.work@gmail.com> wrote:
> > Man you guys are fast. :-)
> >
> > Gary Ring
> >
> > On 1/18/06, Gary Ring <garyring.work@gmail.com> wrote:
> > >
> > > T.J.
> > >
> > > First you have to answer the question, "What is DTP and what is it
> used
> > > for?"
> > >
> > > The Cisco answer: Dynamic Trunking Protocol (DTP) for negotiating
> > > trunking on a link between two devices and for negotiating the type of
> > > trunking encapsulation (802.1Q or ISL) to be used
> > >
> > > That being said. You must specify the type of encapsulation you want
> to
> > > use on the trunk link (dot1q or isl). Then, you must issue the
> command
> > > switchport mode trunk. This sets the port to a trunk unconditionally
> and
> > it
> > > will no longer use DTP frames to try to negotiate becoming a trunk nor
> will
> > > it listen for DTP frames.
> > >
> > > Gary
> > >
> > > On 1/18/06, T.J. Mitchell <tj.mitchell@verizon.net> wrote:
> > > >
> > > > Guys -
> > > >
> > > > How would you disable DTP on the 3550 series switch?
> > > >
> > > >
> > > >
> > > > Thanks
> > > >
> > > >
> > > >
> > > > T.J. Mitchell
> > > >
> > > >
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