I want to share this limitation on ISSU for fabric enabled devices.
***Note*** ISSU is not supported via Cisco DNA Center or manually via the CLI in SDA.
See Release note - 2.3.5.x Section Limitations and Restrictions
In addition the limitation was mentioned before in this Bug Notes
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwa57024
https://bst.cisco.com/quickview/bug/CSCwe39441
This limitation will effect an ISSU capable fabric node like:
C9500/C9600/C9400 SVL - Border Nodes or Edge Nodes
C9400 Chassis with Dual-Sup - Edge Nodes
C9800 - WLC HA CLuster
Without ISSU any sda device have to be rebooted during software upgrade leading at minimum 3 minutes outage.
Any feedback or comments are welcome !
