2 MX and a Switch for warm spare

[ANC]

Hello everyone from Spain.

I have a client who has an MS210-24, 2 MX67s and a public IP offered by his ISP. Is it possible to connect the two MX with warm spare using VLAN on the switch? The idea is ports 1-4 VLAN 10 and the rest VLAN 1. Connect the router isp in port 1 and the two mx in ports 2 and 3 for WAN and 5 and 6 for lan. Could you put the same ip-wan on both MXs using STP on the port?

Thanks and sorry for the google translation.

[alemabrahao]

No, you can't set the same WAN IP on both MXes, the only way is using a NATed IP for WAN interfaces.https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair

[ww · Accepted solution]

Take a look here for info / a slide deck regarding using a switch for lan and wan

https://community.meraki.com/t5/Security-SD-WAN/How-to-turn-MS120-into-WAN-breakout-for-2-ISPs-and-2...

[PhilipDAth]

As @alemabrahao says, each MX needs its own IP address.  Considering changing to a circuit with the ISP that comes with a /29, or using two Internet circuits.

[ANC]

Thank you for your response. As I already knew, I will have to convince the customer to hire a /29 or keep the second MX in a closet until I need it. 

It would not be a bad idea to implement the option of wan port off until the connection error and spare activation.