FortiGate connected to a 2 lenovo switches running vLAG

Hi All,

Just trying to ascertain the best approach here.

Currently I have a Lenovo Nutanix appliance that has 3 nodes which each are connected to 2 switches and is running vLAG.

The switches have ISL running between them and the Fortigate is currently connected to switch01 and everything works.

I had an issue today whereby switch01 had an issue which meant I lost connection to the network.

What is the best approach to be able to have links to both switches without causing a loop?

I am aware of LACP and trunking between multiple ports to 1 switch, can you do the same in this can but aggregate across both switches?

Appreciate any thoughts.