MX Warm Spare Design Inquiry

[KSM]

Hi~

I know that for MX HA configuration, I need to run VRRP and for that I need one L2.

I was wondering if both of the following configurations would work?

If they do, isn't the configuration below more convenient because it doesn't have one more cable?

[ww · Accepted solution]

The last one is the meraki recommended (using lan for vrrp)

https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair

using direct link between mx + connection to the lan switches have caused loops in the past. 

[KSM]

Thank you for your reply.

MX interlink and bottom link VLAN are different, can I still get a loop?
Cisco knows stp is per vlan, but meraki doesn't.

[cmr]

As stated by @ww , use the lower design, not the upper one with the direct link.  You'll curse yourself if you choose the top one...

[KSM]

I'll use the topology below, thank you!