Hi All,
I have been reading the Cisco DNA Centre Cluster and High Availability guide and it states that three switches should be used for DNAC connectivity to maintain cluster availability. This is because a DNAC cluster can only manage a single node failure, so if two DNAC servers were connected to the same switch, and that switch fails, the cluster will fail.
In most DC environments, customers usually have a pair of core or access switches so its a tough sell to try and install a third switch just for DNAC.
How much of an issue is this in reality? For example, if the switch that is connected to 2 DNAC servers fails causing the servers to disconnect from the network and for the cluster to fail, no network operations are impacted as DNA is not sitting in the control or data plane. In this scenario, do we just lose the ability to provision the network? If the switch failure cannot be resolved quickly, can we reconnect the impacted DNAC servers to the healthy switch to restore the cluster?
Thank you
