critical options in dot1x

From: GAURAV MADAN (gauravmadan1177@gmail.com)
Date: Tue Mar 03 2009 - 13:26:15 ARST

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Hi All

I see following options :

Rack1SW2(config)#dot1x critical ?
  eapol Send EAPOL-Success on successful Critical Authentication
  recovery Set 802.1x Critical Authentication Recovery parameters

Rack1SW2(config-if)#dot1x critical ?
  recovery Enable 802.1x Critical Authentication recovery
  vlan Configure Critical-Auth policy VLAN on this interface
  <cr>

I am referring to documentation at :
http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.2_25_sec/configuration/guide/sw8021x.html

I find nothing related to critical options .
Ques : What is dot1x critical authentication .? How is this different from
noral authentiation provided by Dot1x .

Thnx in advance
Gaurav Madan.

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