Hi Michael,
Its RADIUS over a UDP vip which is doing per datagram load balancing.
However having thought this through more it makes sense that its still using it as the connection is still active.
I think i may switch to stateless UDP and change the connection time out to immediate, this would remove the connection issue and changes would take effect right away.
The only issues i have had with this are on very busy systems i have seen the load on the BigIP get quite high.
I am very comfortable using b conn delete, so no worries there.
Thanks