Trunking a MX250 HA to MS425 to run a MS450-12 as CoreL3

[OM1000]

Hello everyone, 

I have been getting mixed answers and want to confirm this topology. 
Am I able to have a MX250 HA pair, LACP to MX425-16 by SFP+. Then run QSFP+ 40G from the MS425-16 Uplink to the MS450-12 40G ports as the QSFP28 ports don’t lower link speeds and also is an uplink port. Using MTP OS2 or OM5 jumpers. 

Then trunking 40G QSFP+ to all my MS390-48UX’s. 

Will this work or I am skipping over a thought? 

Thanks much for your time understanding…

[Ryan_Miles]

MX doesn’t support LACP. The recommended topologies are listed here. 

[cmr · Accepted solution]

Everything else looks good, just that the 2x 10Gb links to the MX will be in active/passive mode with one being blocked at the switch end by spanning tree.  Don't set the links to the MX up as a port channel on the switches, just do two matching ports.

[alemabrahao]

As @Ryan_Miles said MX does not support LACP, also read It:

https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Link_Aggregation_a...