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2020 Views 1 Reply Latest reply: Dec 17, 2011 6:33 AM by Elvin Arias RSS

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Port Channel LACP Mode Combination: On - Active

Dec 16, 2011 10:20 PM

gerold.polle 2 posts since
Sep 18, 2011

In the student guide "Implementing Cisco Switched Networks" Volume 1 (page 2-61) are only the following LACP mode combinations mentioned:

 

On                         (Channel)        On

On/Active/Passive  (No Channel)   Off

Active/Passive       (Channel)        Active

Passive/On             (No Channel)   Passive

 

What is with the missing following LACP mode combination?

 

On                         (?? Channel)   Active    

 

Will it build a Channel or No Channel?

  • Elvin Arias 1,859 posts since
    Mar 12, 2010

    In order to form a LACP channel you can only combine these:

     

    Active - Active

    Active - Passive

    On - On

     

    Any other combination will not properly form the LACP channel. As a side note i recommend you to always use a negotiation parameter, for example the "Active", because the "On" mode is not negotiation per se an could lead into layer 2 loops in certain cases, eventhough there is a feature for misconfigurations like these where STP protect the ports putting them into the err-disable state, you could try that in your lab, the feature is called "STP channel-misconfig" and is on by default.

     

    Elvin

     

    Message was edited by: Elvin Arias

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