Forum Discussion
Rajeev
Nimbostratus
NimbostratusWould Auto last hop feature work with multi vrf environment on F5
Hi Team, this is regarding auto last hop feature, If we have two vrf on upstream device(switch) and the traffic is coming on respective VIPs on F5 , we have auto last hop feature enabled on F5, then...
In additon to what PSFletchTheTek wrote, Auto Last Hop only applies to traffic from clients towards the F5. For the traffic that goes from the F5 towards the pool members, the routing table is used. So, if I understand your network topology correctly this setup should work fine with Auto Last Hop enabled. The F5 will just return the packet towards the client to the same interface it came in at first.
HI,
Not totally sure on your network layout, but to try to help auto last hop looks at the mac of the incoming packet and makes sure it goes back to the same location, this is BEFORE it looks at the routing table.
So its good if you have higher networks where traffic may come from different locations, it should go back to where it came from.
The only issue here is, managing the default route on the return path of the external network.
Comms will leave the f5 correctly, the issue is normally when it hits the higher router will it then default to a different path to the incoming traffic.
We had to tweak our network design to make this work cleanly, but in our case it wasn't a difficult thing to change and has worked really nicely ever since!