I've setup F5 BGP peering with router and have problem due to we can't use floating IP as IP BGP neighbor address https://support.f5.com/csp/article/K62454350 . So we need to use self IP as IP BGP neighbor address.
Problem is It's make router can't decide which path is correct when they send response traffic to F5. F5 active unit or standby unit. Router can't know status on F5. I try to add prepend on BGP which is standby unit and it's fine. but when standby unit takeover . it's failed again.