HELP - Configuring LACP on online Links afterwards

[whistleblower]

Hi all,

I´ve an urgent question regarding your experiences with the following scenario...

I noticed that 2 switch ports on the meraki switch are on the opposite side configured for a LACP LAG - the correct configuration should be a LAG but how should I fix that? regarding the official documentation the links should be connected after the Aggregation has been configured in dashboard, but that`s unfortunatley now not possible anymore?!

maybe someone has an experience and can tell me if it can also work with active ports?

thanks for any response

[GIdenJoe]

Hey,

You can always bundle or split ports into LACP port-channels when they are configured identically and are at the same operational speed.  So if you now have two 1gig ports that are online you can combine them without issue.

Only when there is a discrepancy in the config or if one port is at 100Mbps while the other is at 1000Mbps then you cannot combine them.

Also the port-channel has to be LACP.  It will not form any static bundles.

[whistleblower]

OK - but will there be an interruption for the productive enviroment? I´ve to say that this ports are used as uplinks for the meraki equipment (internet access) too... 😞

[GIdenJoe]

I haven't tried using a continuous ping but I have never noticed a drop of more than a second in connectivity when forming a port-channel.
The thing is that you are not shutting down ports but actually opening an secondary port so it is only STP convergence happening in the background.

[PhilipDAth]

Also if the LACP fails to form, just bounce the ports one at a time in the Dashboard (which is likely unplugging and plugging them back in).