For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

Peter_Z's avatar
Peter_Z
Icon for Cirrus rankCirrus
Aug 16, 2011

HW Failover - what's behind it?

I'm curious about How the HW (serial-based) failover really works.   In their documentation or training materials, F5 only states that there is merely a voltage (no special data) passed over the s...
basic
getting started
new to f5
Peter_Z's avatar
Peter_Z
Icon for Cirrus rankCirrus
Aug 16, 2011
Even if it's at the software level, you have to have software-to-software link between the distant boxes (in a form of specially forged messages announcing the Active box presence or change of state etc). Otherwise you will end up with two Standby boxes.

 

 

But you have no such connectivity with only serial cable - only a change at the physical layer can be detected.