Forum Discussion
MW1
Cirrus
CirrusAdding standby F5 to HA pair using network failover
All,
can anyone advise why when I add a standby F5 LTM to a active/standby HA F5 LTM setup using network fail over the interfaces on the active F5 go offline after the device "see each other"...
Hamish
Cirrocumulus
CirrocumulusA system going active/standby/active is usually because of a detection of an active/active situation. That listtle toggle of active/standby/active will ensure that any ARP caches are updated with the correct info due to the gratuitous ARP's that are done as a system goes active.
On the subject of 'Preferred Active'. I'd lose it. It doesn't really work very well in my experience. In fact there's at least two scenarios that it causes problems (i.e. The 'preferred active' box always comes up active and then you get an active/active situation. Stuff like that...
In v9 if you have network failover, there's only 1 network that can be used for the HA heartbeat... Make sure you don't have problems with that link, and I would generally advise that it's on a dedicated point-to-point network (Without or without switches. But only use switches if the two boxes are out of reach with a single cable). V10 you can have multiple HB networks setup. MUCH nicer and MUCH more stable... Run (don't walk) to upgrade to v10 just for that reason IMO.
Hamish
