configure MX HA

[Shaima]

Our MX65 is configured as PPoE. How to configure HA (Active -Active or Active - Passive) we have 2 MX65?

[alemabrahao]

There is no active-active HA. Check the documentation.

Only one license is required for an HA pair. The warm spare unit does not require a separate license. Alerts for warm spare failover can be configured on the Alerts and Administration page.

Note: The secondary MX must be the same MX model as the primary. Warm spare functionality is not supported between different MX models (e.g. MX85 and MX105).

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

[ww · Accepted solution]

You need to check your isp how/if its possible to connect a second mx device with PPPOE on the same line. 

>if not possible you would need to add a nat router in front of the 2 MX

Or you need another ISP line for the second mx

[PhilipDAth]

Building on @ww's answer; in short, you need to purchase an Internet circuit capable of supporting HA.  A single PPPoE circuit can not support HA.  You'll need the provider to:

• Give you a circuit with at least a /29 of address space (and it won't be using PPPoE), which you'll need to plug into a switch (unless the provider supplies one in their CPE), and then plug both MX in it.  This is more of a "business grade" service and will almost certainly cost a lot more than what you are paying for now.
• Get a pair of PPPoE circuits.  You won't have inbound failover for things like NAT, but AutoVPN and client VPN (using DNS) will be able to failover