Forum Discussion

Chandru_14793's avatar
Chandru_14793
Icon for Nimbostratus rankNimbostratus
Jan 25, 2011

F5 High Availablity

Hi,     Currently we have F5 unit1 to be in active mode and unit 2 be in standby mode     We have seen when the active unit fails and standby unit becomes active and whenever the active un...
management
monitoring
Chris_Miller's avatar
Chris_Miller
Icon for Altostratus rankAltostratus
Jan 26, 2011
I wouldn't expect this to be a spanning tree issue. It sounds a lot more like an ARP problem that can be remedied by MAC Masquerading. When the active unit comes back and you have an outage, check the logs on the standby unit and see if you're rejecting traffic. Also, check ARP tables on your switches and see whose MAC the Virtual Server IPs are mapped to. When I had similar problems, the active unit didn't send out gratuitous ARPs to let everyone know it was again the primary. If it doesn't realize it failed over, it won't necessarily do that.

 

 

https://support.f5.com/kb/en-us/solutions/public/7000/200/sol7214.html