From: Geert Nijs (geert.nijs@simac.be)
Date: Mon Mar 13 2006 - 13:42:26 GMT-3
Thanks. Good reference.
________________________________
From: Alex Arseniev [mailto:alex.arseniev@gmail.com]
Sent: maandag 13 maart 2006 16:57
To: Geert Nijs
Cc: ccielab@groupstudy.com
Subject: Re: Trunk Modes theory
I believe the answer is "no trunk is formed"
Reference
http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note
09186a00801429fb.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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