Configuring sync on GTM devices.

I found a lack of initial setup information when I received new BIG-IP GTM devices, so here is the full list of steps I took to set up the GTM sync group after getting the device on the network. This was performed on version 12.1.3 devices.

• License/Provision devices
• Go to Platform to set Management IP, Hostname, Timezone, and admin/root passwords
• Go to Network Click Finished to perform device setup manually
• Create VLAN on both devices
• Create Self IP on both devices (set Port Lockdown to Allow Default)
• Create Default Route if necessary on both devices
• Go to System > Configuration > Device > NTP to configure NTP on both devices
• Renew Device Certificate using new Hostname on both devices
• Add DNS Listeners on both devices using Self IP
• Add Trusted Device Certificates on both devices
• Add Trusted Server Certificates on both devices (same certificate as in previous step)
• Create Data Centers on both devices
• Create Prober Pools on both devices (one for each Data Center)
• Create a Server for each device on both devices
• Assign each Server to its respective Prober Pool
• Go to DNS > Settings > GSLB > General
• Click checkboxes for Synchronize and Synchronize DNS Zone Files on both devices.* Ensure that the Group Name is the same between these devices, and different from any other GTMs that are in your environment.* Click Update!

And that should do it! As long as your Firewalls/ACLs are allowing Destination Port 4353 between the devices... This is just meant to be a very simple guide, so there may be other considerations to think about when performing these steps in your environment. Hope this helps somebody out there!