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

    Port Channel LACP Mode Combination: On - Active

    gerold.polle

      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?

        • 1. Re: Port Channel LACP Mode Combination: On - Active
          Elvin Arias

          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