problem configuring mx95 in HA using only 1 uplink IP for 2 boxes.

[marcosalef]

Hello, I am having some doubts and problems configuring the two mx95 boxes in HA because I only have one ip available from the router and I would like to know if it is still possible to establish a connection through the first box.

Note: I read the documentation, and it says that I need to have different WAN uplink IPs.

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

[DarrenOC]

Hi @marcosalef , you are correct but also depends on which design you require.  I always go the VRRP route so this requiring 3 public IPs.

[marcosalef]

Thank you very much @Darren OC I had forgotten to mention the Virtual Router Redundancy Protocol and I really need 3 public IPs. Thank you very much for replying and remembering.

just need to clarify, the 2 ips are for each box and a Shared Virtual IP used as the default gateway for the devices on the network. is that it?

[DarrenOC · Accepted solution]

Hi @marcosalef , that is correct. 1 IP per MX and the third for the VRRP.

[PhilipDAth]

I guess you should also consider that VRRP is optional.  A minimum of 2 IP addresses is mandatory (one of each MX).  Also of note is that if you don't use VRRP that the IP addresses don't have to be from the same ISP circuit.

You could use the primary circuit on the primary MX, and a cheap consumer grade Internet circuit for the secondary MX.

ps. I only enable VRRP on about 25% of the installs tat I do.