ntp authentication

Hello,

I am playing with NTP authentication and it is not working as I axpect. Here is
the configuration:

R1, master ntp server, authentication configured.
    ntp authentication-key 1 md5 0802455D0A16 7
    ntp master 2

R2, ntp client with authentication, but wrong key configured:
    ntp authentication-key 1 md5 13243531 7
    ntp authenticate
    ntp trusted-key 1
    ntp clock-period 17179862
    ntp server 131.1.12.1 key 1

R3, ntp client, NO authentication configured:
    ntp server 131.1.13.1

As a result:
R2 does not get time from R1 which is expected.
But R3 gets time from R1 even if it has no authentiocation configured:
R3#sh ntp status
Clock is synchronized, stratum 3, reference is 131.1.13.1

Why R3 gets time from R1 then ?

Thanks,

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Received on Wed Jul 14 2010 - 10:22:55 ART