HA Groups vs VLAN Failsafe vs Neither
We don’t currently make use of VLAN failsafe or HA groups in two of our 3 LTM appliance HA pairs. I’ve been doing some reading to try to determine what the best path is for us. I’m predominantly concerned with physical switch failure. If we have some sort of routing or VTP problem I'm unsure how VLAN failsafe or HA groups will help. From what I can find it seems like HA Groups is the preferred method in TMOS v10 and newer. What I’m wondering, is that if you have a configuration like the below figure 1 where each F5 is connected to both switches do you really need either VLAN failsafe/HA Groups? In figure 2, I would definitely think you would want either VLFS or HA Groups configured because losing a switch means an F5 is without connectivity. Looking for feedback and thoughts on this or if there is a definite way to configure VLFS or HAG based on each config. The documentation is pretty light on how either feature should be used based on the network design.
1)
2)