CCIE Pursuit Blog

May 22, 2008

Lab Tip: Cisco Proprietary versus Open Standard EtherChannel Protocol

Filed under: Cisco,Cisco Certification,IOS,Switching — cciepursuit @ 2:15 pm
Tags: , , ,

I’ve run across this type of question a couple of times in labs:

Configure interfaces fa0/19 – 21 into an EtherChannel using an open standards protocol.


Configure interfaces fa0/19 – 21 into an EtherChannel using a Cisco proprietary protocol.

This always throws me for some reason.  I know that the two EtherChannel protocols are PaGP and LACP, but I can never remember (probably because I never thought that it would be important) which protocol is Cisco proprietary and which is open standards.  I tried looking this up in the DOC CD one time, but did not see it mentioned.  I eventually just hit Wikipedia to get the answer, but I’m pretty sure that will not be available in the lab.

I’ve developed a simple (and most likely stupid) method of remembering this:

PaGP starts with P which is the letter  that ‘proprietary’ starts with.

It’s kind of lame, but it gets the job done for me so I thought that I would share.






  1. It doesn’t help that some non-Cisco products support PAgP, too. We’ve got some HP boxes at work that can do PAgP as well as LACP. But maybe it helps to remember that LACP is tied to standard 802.3ad, which implies industry versus proprietary. Somehow, the association with LACP to 802.3ad has always stuck in my head.

    Comment by Ethan Banks — May 22, 2008 @ 3:35 pm | Reply

  2. You can bet that this tidbit of information will stay with me until I have to use it again.

    I rarely have the opportunity to work with switches or routers at work because we are such a small operation. But when my boss asked me to configure an old Dell PowerConnect switch to talk to a 2950 (a little less than 2 years ago.), I remember having to learn about LACP and PAgP. Of course I’ve forgotten much of what I learned about it. But this post brought back some minor details. Which prompted me to dig through old pdf documents I collected for it. Which subsequently made me read more about it again… in which i was pleasantly surprised to how easily I understood the material better than the first go around.

    So, I guess, thank you =) Ahh! the beauty of blogging.

    Comment by Aragoen Celtdra — May 22, 2008 @ 5:34 pm | Reply

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