One of my clients requested to refresh PMK (more about PMK) every 5 minutes during deployment of Cisco ISE and Meraki solution.
1. Create new Authorization Profile in Cisco ISE (Policy -> Policy Elements -> Results -> Authorization Profile)
Reauthentication—To choose, select the check box and enter a value in seconds for maintaining connectivity during reauthentication. You can also choose attribute values from the Timer drop-down list. You choose to maintain connectivity during reauthentication by selecting to use either the default (a value of 0) or RADIUS-Request (a value of 1) from the drop-down list. Setting this to the RADIUS-Request value maintains connectivity during the reauthentication process.
2. Associate the new Authorization Profile with the active 802.1x policy. Done!
Check your Live Logs panel (Operations -> RADIUS -> Live Logs). You should be able to see authorizations roughly every 45 seconds.
Also, you can capture traffic in the Meraki Web Panel.
Use filter expression
port 1812 or port 1813 or port 3799 to capture only RADIUS traffic.