Cisco ISE: 802.1x Timers Best Practices / Re-authentication Timers [EAP-TLS]

Question

Dear Folks,
Kindly, suggest the best recommended values for the timers in 802.1x (EAP-TLS)... Should i keep default all or change or some of them?
Also, what do we need reauthentication timers? Any benefit to use it? Does it prompt to users or became invisible? and What are the best values, in case if we need to use it?
Thanks,
Regards,
Mubasher
My Interface Configuration is as below;
interface GigabitEthernet1/34
switchport access vlan 131
switchport mode access
switchport voice vlan 195
ip access-group ACL-DEFAULT in
authentication event fail action authorize vlan 131
authentication event server dead action authorize vlan 131
authentication event server alive action reinitialize
authentication open
authentication order dot1x mab
authentication priority dot1x mab
authentication port-control auto
mab
snmp trap mac-notification change added
dot1x pae authenticator
dot1x timeout tx-period 5
storm-control broadcast level 30.00
spanning-tree portfast
spanning-tree bpduguard enable

Answer 1

Hello Mubashir,
Many timers can be modified as needed in a deployment. Unless you are experiencing a specific problem where adjusting the timer may correct unwanted behavior, it is recommended to leave all timers at their default values except for the 802.1X transmit timer (tx-period).
The tx-period timer defaults to a value of 30 seconds. Leaving this value at 30 seconds provides a default wait of 90 seconds (3 x tx-period) before a switchport will begin the next method of authentication, and begin the MAB process for non-authenticating devices.
Based on numerous deployments, the best-practice recommendation is to set the tx-period value to 10 seconds to provide the optimal time for MAB devices. Setting the value below 10 seconds may result in the port moving to MAC authentication bypass too quickly.
Configure the tx-period timer.
C3750X(config-if-range)#dot1x timeout tx-period 10