Re: Design reasons for LACP active versus on

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
>
>
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Received on Tue May 12 2009 - 21:24:00 ART