Warm/Spare question

[john9]

Hello.

I have a question about a Warm/Spare setting.
There are two MX250s connected to two ISPs through a switch.

As it is configured today, when one of the internet links goes down, both MX become masters, causing connectivity problems on the internal network. I think the Heartbeat VVRPs are communicating over the WAN.

What can be set wrong?

The MX are in routed mode.

[ww]

Mx in routed mode does not run vrrp on the wan.(only in concentrator mode)

In routed mode vrrp runs on the lan.

Do you have a drawing how its all connected?

[john9]

Hi,

The topology is below. So, in concentrator mode the vrrp is on the wan interface? 

Will check again the mode.

[Brash]

In One-Armed Concentrator mode, VRRP heartbeats will use the WAN interface as that is the only interface connected to the network.
In Routed mode, the VRRP heartbeats should traverse the internal networking using the LAN interfaces.

From the look of your diagram, your MX's are most likely in routed mode.

[KarstenI]

Here is the relevant documentation for HA on the Meraki MX:

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

I would also consider a second WAN-switch to remove that single-point of failure.