Fwd: Design reasons for LACP active versus on

Also,

One scenario where we had to use "on" versus pagp or lacp was if we used
3750's w/ stackwise. For instance, if one physical interface was on switch 1
in the stack and one physical interface was on switch 2, IOS wouldn't allow
us to use PAGP or LACP to port channel them. "On" works fine in this case,
just make sure your wiring guys know where to plug in the cables :)

Chris

---------- Forwarded message ----------
From: Chris Breece <cbreece1_at_gmail.com>
Date: Tue, May 12, 2009 at 9:24 PM
Subject: Re: Design reasons for LACP active versus on
To: Cisco certification <ccielab_at_groupstudy.com>

I've created spanning tree loops using "on". LACP has some sanity checking
built in to prevent this.

For instance, a typical access layer switch plugged into two distribution
switches all connected via layer 2. Configure the following

access layer switch:

*int po1*
*switchport trunk encap dot1q*
*switchport mode trunk*
**
*int gi1/1*
*switchport trunk encap dot1q*
*switchport mode trunk*
*channel-group 1 mode on*
**
*int gi1/2
*
*switchport trunk encap dot1q*
*switchport mode trunk*
*channel-group 1 mode on*

Now plug gi1/1 into distro switch 1, and gi1/2 in distro switch 2.

Watch the network explode :P

LACP would err-disable the ports in this scenario.

Chris

On Tue, May 12, 2009 at 6:48 AM, Thameem Maranveetil Parambath <
tparamba_at_thecontactcentre.ae> wrote:

> If you configure statically (on), the negotiation time can be saved. So I
> would go for (on) rather than active or desirable.
>
>
>
>
> Marc La Porte <marc.a.laporte_at_gmail.com>
> Sent by: nobody_at_groupstudy.com
> 12/05/2009 02:46 PM
> Please respond to
> Marc La Porte <marc.a.laporte_at_gmail.com>
>
>
> To
> Cisco certification <ccielab_at_groupstudy.com>
> cc
>
> Subject
> Design reasons for LACP active versus on
>
>
>
>
>
>
> Hi,
>
> From a design viewpoint, configuring LACP (L2 Etherchannel) from an access
> switch (6500) to a third-party server (IBM, HP, etc) would it be better to
> configure our side as "active" or as "on"?
>
> Thanks
> Marc
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
>
>
>
> The content of this email together with any attachments, statements
> and opinions expressed herein contains information that is private
> and confidential and intended for the named addressee(s) only. If
> you are not the addressee of this email you may not copy, forward,
> disclose or otherwise use it or any part of it in any form
> whatsoever. If you have received this message in error please
> notify postmaster_at_etisalat.ae by email immediately and delete the
> message without making and copies.
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Tue May 12 2009 - 21:33:53 ART