switch is HP 3600-24-PoE+ v2 EI , software Version 5.20.99, Release 2110P05
I use eap as per below
[TEST_HP_3600]dot1x authentication-method eap
this is straight from 3600 Security Guide:
"Specify the eap keyword to enable EAP
relay"
dot1x authentication-method
{ chap | eap | pap }
I aslo got some support from HP:
"Comware 5 has max session expire timer is 7200 second. It does not support “Session never expires” as per your requirement.
You can use below command to configure maximum periodic online user re-authentication function.
dot1x re-authenticate
dot1x timer reauth-period “value”
Now I'm not sure whether you can do it from switch end?
If not I'd try changing setting on client itself