Re: Using vtp with third party switches in-the-middle

Hi Rob

Paul is correct, I have used Nortel/Cisco mixed Lans and the Nortel ethernet
switches process the VTP frame as a standard frame. resulting in VTP passing
through the Nortel switch.
But honestly you would be better setting all your VTP devices to transparent
or atleast disabling vtp pruning in this scenario.

Cheers.
Josh

On Fri, Oct 2, 2009 at 8:03 AM, Paul Cosgrove <
paul.cosgrove.groupstudy_at_gmail.com> wrote:

> Hi Rob,
>
> If the nortel doesn't run VTP or other protocols which use the same mac
> (e.g. DTP, UDLD, CDP - and I presume it doesn't) then it would not process
> the VTP payload itself, just switch the frame out.
>
> The Nortel will not recognise the destination mac used by VTP
> (0100.0ccc.cccc) as having any special significance, so it will be passed
> through like any other transit frame in that vlan. The bit you may not
> like
> so much is that the Nortel will also flood it out all the other ports it
> has
> in vlan 1, since it will never have a source port associated with that mac.
>
> You would not want DTP negotiating through a third party switch, and should
> disable it on the ports.
>
> Paul.
>
> On Thu, Oct 1, 2009 at 2:38 PM, Rob Clav <robclav_at_gmail.com> wrote:
>
> > Hi folks,
> > I'm challenged to use vtp where the vtp server switch is behind a Nortel
> > Switch.
> >
> > First option: Using QinQ tunnel. Problem, some devices are 2960 that seem
> > they don't support QinQ.
> > Second option: Try to active vtp protocol at the trunk connecting nortel
> > switch, and let`s see if nortel,don't modify dtp and send them thought
> the
> > nortel to the opposite site.
> > Third option: Write down and send this problem to the groupstudy mail...
> >
> > I didn't try the options yet, because the switches are at non-stop
> > environment.
> > Many thanks,
> > Robclav
> >
> >
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Received on Fri Oct 02 2009 - 20:00:07 ART