From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Thu Jan 19 2006 - 17:04:39 GMT-3
Just a note on this one.....you have to set it up in the following
order......
Switchport encapsulation dot1q
Switchport mode trunk
Switchport nonnegotiate
....otherwise the switch will complain about being "Auto"...."dynamic",
etc....
Dave Schulz,
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Sequeira
Sent: Wednesday, January 18, 2006 11:20 PM
To: Gary Ring
Cc: T.J. Mitchell; Cisco certification
Subject: Re: DTP
By configuring this command on each end of the link - you completely
stop the sending of DTP frames on this link.
Is anyone listening for them? Well - not sure I care ;-) But since
the trunks are also in UNCONDITIONAL trunk or access mode - I would
have to say no.
On 1/18/06, Gary Ring <garyring.work@gmail.com> wrote:
> 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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