How to Configuration Fully Redundant (Multiple Switches)

[BRC-TH]

I want to set up Fully Redundant as in the picture.

1. MX. A and MX. B  To MS. What settings do I need?

2. Uplinks  MS to MX, what settings do I have to set?

3. Uplinks  between MS to MS, what setting must be set?

Device list

MX64 = 2

MS120-24 = 2

[MyHomeNWLab]

I think the main important setting elements are as follows.

* Configure Warm-Spare for Meraki MX device redundancy; Warm Spare operates in Active Standby.

  MX Warm Spare - High-Availability Pair - Cisco Meraki
  https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair

* Meraki MX does not speak STP. Meraki MX transmits received BPDUs transparently.

  Therefore, Meraki MS runs STP for loop prevention purposes (Default value: Enabled).
  Note that Meraki MX does not have LAG feature.

  MX Layer 2 Functionality - Cisco Meraki
  https://documentation.meraki.com/MX/Networks_and_Routing/MX_Layer_2_Functionality

I think the other setting elements (VLANs, WAN Load Balancing, etc.) are up to your network design.

[Brash]

As said above, this is fundamentally possible but you will have a loop. STP will block 2 of the ports during normal operation but they should come active in the event of a failure (at which point there would no longer be a loop).

[KarstenI]

I wrote a little bit on this:

https://cyber-fi.net/index.php/2022/03/13/how-to-connect-the-meraki-mx-to-ms-switches/

[PhilipDAth]

Personally, I only connect an MX to a single switch.  I have experienced two many outages due to spanning tree connecting an MX to two different switches.

What's the point of HA if it increases unplanned downtime.