From: Alex Arseniev (alex.arseniev@gmail.com)
Date: Mon Mar 13 2006 - 12:56:34 GMT-3
I believe the answer is "no trunk is formed"
Reference
http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186
a00801429fb.shtml
scroll down 1/2 page below and You see a table with possible combinations
and results.
Of course, this is valid for 5000/6000 switches, YMMV.
HTH
Cheers
Alex
On 13/03/06, Geert Nijs <geert.nijs@simac.be> wrote:
>
> All,
>
> I am studying for my recertification and although i do understand the
> different trunking modes, there has been a large discussion between me
> and
> a colleague for the following specific situation:
>
> First Situation
> SW1 - Fa0/1
> switchport mode trunk
> switchport trunk mode isl
> switchport trunk nonegotiate
>
> SW2 - Fa0/1
> swichport mode desirable
>
>
> Is an ISL trunk being formed or NOT ?
> Trick: nonegotiate makes the port NOT send any DTP packets.
> I always thought that "desirable" NEEDED DTP packets from the other side
> to form a trunk (so: ON, AUTO or DESIRABLE)
> So i would say: NO, their is no trunk.
>
> Several books and docs seem to suggest that in this case, a trunk will
> be formed. I am unable to test right now.
> So what will happen ?
>
> regards,
>
> Geert Nijs
> Service Engineer
> CCIE #13729 <http://www.cisco.com/en/US/learning/le3/ccie/index.html>
>
>
>
>
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