Which command re-enables the feature on a FabricPath interface?

Assuming hello PDU authentication has been disabled, which command re-enables the feature on a FabricPath interface?
A. switch (config-if) # fabricpath isis authentication-type cleartext
B. switch (config-if) # fabricpath isis authentication check
C. switch (config-if) # fabricpath isis authentication-type md5
D. switch (config-if) # fabricpath isis hello-interval

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2 thoughts on “Which command re-enables the feature on a FabricPath interface?

    1. No, answer is B. “fabricpath isis authentication check” indeed:

      https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/fabricpath/6x/fp_n5500_config/fp_n5500_authenticate.html:

      Example :
      switch(config-if)# fabricpath isis authentication-check
      (Optional) Enables an authentication check on the incoming FabricPath Layer 2 IS-IS PDUs for the interface. The authentication check is On by default. (To turn off the authentication check, enter the no form of this command.)

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