Meraki has a pretty good documentation library. The specific topic that you are asking for is here: https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Switch_Ports#Link_Aggregation
This is petty, I know, buuuuut technically you can't.
Port (Ether) Channel is Cisco Proprietary.
Link Aggregation is open.
Meraki uses LACP (Link Aggregation)
Not really a big deal but if you are connecting to a non Meraki switch, just make sure you are using "Active" or "Passive" when configuring the other side of the bundle on the non-Meraki. if you use "on", "Auto" or "Desirable" it wont work.
I'm interested in how this went for you. We just replaced our old core (Catalyst 4506) with a stack of MS250-48's.
Unfortunately, we identified the whole port-channel/channel-group Active/Passive instead of on/auto too late and our series of banks went down. We went ahead and pulled one of the cables in the channel group thus temporarily solving the errors and issues.
Having provided all of that information, our intent is to re-configure the channel group configurations on the older Catalyst 2960's that we have at our banks. So, just looking for an idea as to how anyone's situation went. Were you successful in re-establishing the channel-group or did you have to scuttle that configuration and ultimately upgrade the various network gear downstream?
Any thoughts would be greatly appreciated! Thanks!
I also like to here how this worked out. I'm setting up MS350 with dual ethernet fiber connections to Nexus core using port channel. I have the port channel and two fiber channels setup as trunk ports. I'm using a SVI on the Meraki and Nexus core for routing. I used channel-group 112 mode active to add the ethernet ports to channel group. It works, but not sure this is the best way to handle it. I'm having problems with Meraki pulling a Management IP address. I'm use to using layer 3 port channel groups. I tried using a layer 3 port channel, but couldn't get it working. I like to know how you configured the ethernet ports and port channels. Also, are you using native Vlan 1, or Vlan number of the main SVI you created for uplink? Just trying to figure out best way to handle port channel group setup.
I got it working today. I had to create a second Layer 3 vlans on the Core switch and add a helper address. I added the same vlan to Meraki Management IP configuration and it passed the DHCP request through it. My aggregated ports through port-channel is working with Ethernet trunk ports, port-channel trunk ports and layer 3 vlans. I sent the configuration to Meraki to view and get some feedback on. I will reply if they can provide some useful info, or better way to handle it. I had to set the Ethernet ports to channel-group ### mode active.