You will need an IP address on your management port, even if you do not intend to use it. You can get away without one if you have a standalone appliance, but not when going for HA cluster. You can configure one by typing in command
config
in BASH shell via Serial or SSH connection. This will set up an IP address on your eth0 interface. Eth0 is what you generally use for remote device management (HTTPS/GUI and SSH) instead of a SelfIP.
There's another type of mgmt-interface which is called AOM - that is only available on some physical appliances. Setting up one is optional, but still recommended since it can help you connect to BigIP via SSH when the device itself is powered off. AOM system of BigIP has similarities to the ILO system of HP servers, or iDrac of Dell servers.
In regards to your issue, although you can establish Peer Trust via a non-mgmt interface, not having an IP on your mgmt port could be the cause of the problem you're observing. As you establish Peer Trust, bigip1 tries to gain information about bigip2 mgmt IP address.
If you're still stuck after configuring your mgmt port, check out recommendations others have posted. Also check out the
/var/log/ltm
file, it's a gold mine of troubleshooting hints
🙂
Regards,