I've been running into issues regarding ISSU upgrades using DNAC on the 9400/9500 series switches. For some context, I've been using DNAC for bulk switch upgrades and for the most part, all has been well. However, whenever it comes time to use the IS...

For some context, we have dual Firepower 2140s in HA managed by FMCv. Both FTD and FMCv are on 7.2.5.1 as of last week at the start of 2024. We currently utilize our FTDs as external firewalls and head-ends for both site-to-site VPNs and Remote Acces...