What is the best practice for migrating from iseries to rseries?

Hi Herman2024,

For me, the best migration strategy is:

1. Upgrade the i-series to v15.1.x, in this case, you could set offline one of the current devices and create a cluster with the new r-series device, make a failover, and test the services "it only applies if APM is not provisioned"
2. If APM is provisioned you have two options:
   1. Big bang - migrate the configs into new devices " I recommend updating the i-seres to avoid possible issues in the config migration", so in this case, you have to disable the current devices and then enable the new devices "at the SW level is the best option because you can configure the HA between the devices only provisioning the vlan for this propose but you have to replace the current IPs in the config"
   2. Migrate by services with a different networking config - In this case, the idea is migrating by group of services or VIPs, you have to keep a different network configuration, and in the new devices you have to disable the ARP, for VIPs and SNAT and the migration is easy, you have to disable ARP in the current devices for a group of services and enable in the new devices.

Note: If your current i-series can´t be upgraded because the support contract is over, you could contact your F5 SE to request a temporary license to upgrade the devices. 

I hope it works.