When using the setup utility to configure a redundant pair, you are asked to provide a "Failover Peer IP". Which address is this.

While a management IP can sometimes serve this role, the field is not restricted to the management network; it refers broadly to any reachable address on the peer system, not exclusively the management interface.

The Failover Peer IP is an address configured on the partner BIG-IP system - typically a self IP or management IP on that peer - which the current system uses to contact its redundant pair partner. This allows the two systems to establish failover and HA communication with each other.

This describes the local system's own listening address for failover messages, which is the opposite of what the field requests - it asks for the peer's address, not a local address.

This describes an address on the current (local) system used to initiate mirroring or heartbeat traffic, which again is the wrong direction - the field asks for the peer's address, not the local system's.