The DNAC is currently sold as an appliance (part number� DN1-HW-APL). It costs a whopping $80k list per box! So why do you need three of them when doing a HA setup? It is because of Quorum. The definition of quorum is: "The number of members of a group or organization required to be present to transact business legally, usually a majority." - source: dictionary.com Say you only have two hosts in a cluster.
You probably want to use an existing Identity Store such as Active Directory when managing your network infrastructure – including DNAC. Below is a guide on how to configure this functionality. When you enable external authentication in DNAC it will not exempt you from using the locally defined users on DNAC – at least not the built-in admin user. DNAC External Authentication Configuration Locate the “External Authentication” page in Settings -> System Settings -> Users
If you messed up your DNAC or just want to start over, you can do so by downloading the ISO for the appliance. Get the ISO on the below link: Download DNA Center ISO from CCO After downloading the ISO, you� must� create a USB installer by using� Etcher If you use Rufus or any other tools for the USB installer creation, it might not work due to insanely long file names in the ISO.
NOTE! Using ISE 2.3p3 is not an option due to CSCvi94778 If you’re deploying a DNAC and you want to integrate with ISE, you might have read the following documents: Perform Post-Installation Tasks Cisco ISE Integration Limitations I did and ended up with this error in DNAC when adding ISE: Clearly this is a certificate error. The thing is that Cisco mentions that SAN (Subject Alternate Name) is essential for the trust between DNAC and ISE.