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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter       Configuring Identity Features on Layer 3 Interface
Authentication Methods
Interface      MAC Address     Method   Domain   Status         Session ID
Gi0/1          000d.e105.c771  dot1x    DATA     Authz Success  03030303000000000000BA04
c1921#show authentication sessions interface Gi0/1
            Interface:  GigabitEthernet0/1
          MAC Address:  0201.0201.0201
           IP Address:  Unknown
            User-Name:  testUser1
               Status:  Authz Success
               Domain:  DATA
       Oper host mode:  single-host
     Oper control dir:  both
        Authorized By:  Authentication Server
           Vlan Group:  N/A
         AAA Policies:  
      Session timeout:  N/A
         Idle timeout:  N/A
    Common Session ID:  03030303000000000000BA04
      Acct Session ID:  0x00000001
               Handle:  0x6D000001
Runnable methods list:
       Method   State
       dot1x    Authc Success
c1921#
Configuring the MAC Authentication Bypass (MAB)
Perform these steps to configure the MAB.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface gigabitethernet slot / port
4. authentication port-control auto 
5. mab
6. end