Balance 580 currently has 3 hardware revision (HW).
For a “perfect HA pairing”, it should be one of the options below.
- A pair of Balance 580 with HW1, that supports latest firmware of 6.3.4.
- A pair of Balance 580 with HW2/3, that supports latest firmware of 7.0.1.
If you mix between the 2 options, you’ll have to stick with the latest firmware that is supported on both unit, which is 6.3.4. In addition, the newer hardware platforms have performance improvement over the older hardware, thus it should be noted that there might be performance differences in the production environment with different hardware version HA pair.
Last to note is that LACP features not available on older hardware version, HA will work if these features not enabled.