Cisco ASA AAA Simultenouse mode

Hi Cisco expert:
         In a ASA5510, if Accouting mode is configured as Simultenouse, and I have multiple RADIUS servers listed in the server group, does it mean "and" or "Or"? For example, if I have two RADIUS servers, do I need both servers to say ok or just either one to say ok to authenticate?
          Thanks.
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flyingskyAsked:
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Nayyar HH (CCIE RS)Network ArchitectCommented:
Its used to indicate wether a single server or all servers in group should recieve accounting messages. see command reference below.

https://www.cisco.com/en/US/docs/security/asa/asa81/command/ref/a1.html#wp1565872
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flyingskyAuthor Commented:
I understand that. what I am trying to figure out is, if both RADIUS servers receive the message, one authenticate success and the other one fail, what will happen.
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Nayyar HH (CCIE RS)Network ArchitectCommented:
This command affects AAA accounting only not authentication.
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