From: Khurram Noor (engr.khurramnoor@googlemail.com)
Date: Sat Mar 21 2009 - 12:39:55 ART
Well not really... my question was related to the confusion of port state
and ether channel.
I was confused with the switch port mode *dynamic desirable*. As the port
having this mode does not indicate whether its a trunk or access port. So
how would etherchannel be effected by this behavior. As the methodology says
ether channel inherits the port properties, then what property is the
etherchannel going to inherit from port in this mode.
I have made following understandings to cover my confusion and i will
appriate if there is some mistake in it that anyone of you can correct..
whenever required to make etherchannel over access or trunk ports, i have to
avoid negotiation that is done through dynamic desirable so that the switch
has an permenent state of being either access or trunk port by hard coding
it as trunk or access port. Then i can safely perform etherchannel
negotiations on them.
Am i Correct?
On Sat, Mar 21, 2009 at 1:47 PM, Thameem Maranveetil Parambath <
tparamba@thecontactcentre.ae> wrote:
>
> Negotiation of trunking and etherchannel is totally isolated one, according
> to my understanding..
>
> if u have two 3550.. it will form trunk by negotiation..
>
> if u want to make etherchannel for this interfaces , you have to either
> make them
> a) negotiate with pagp
> b) negotiate with lacp
> or
> c) manually enable etherchannel on both ends!
>
> is that what you are looking for?
>
> REgards,
>
>
>
> *Khurram Noor <engr.khurramnoor@googlemail.com>*
> Sent by: nobody@groupstudy.com
>
> 21/03/2009 11:29 AM
> Please respond to
> Khurram Noor <engr.khurramnoor@googlemail.com>
>
> To
> Cisco certification <ccielab@groupstudy.com> cc
> Subject
> Negotiation over Trunk links
>
>
>
>
> Hello everyone!
>
> A question is keeps teasing me everytime when i configure trunks. As we all
> know all 3550 can negotiate trunks by default so if i have to configure
> etherchannel over two to three links between two (3550-3550 or 3550-3560)
> switches and there is a requirement that the switches should negotiate
> etherchannel using either PagP or LacP, what should be the best practice?
>
>
> 1. Should i hard code switchports the mode of trunk and then perform
> etherchannel negotiations between them.
> 2. Or both trunking and etherchannel can be negotiated one after another.
>
>
> I tried to do both negotiations together in my home lab and found strange
> behaviour or etherchannel. sometimes it gets negotiated correctly and
> sometimes it doesn't.
>
> **
> *Khurram Noor*
> *CCIP,CCNA*
>
>
> Blogs and organic groups at http://www.ccie.net
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