ntp authentication fails

[loic.fouray]

Hello,

I am a problem regarding NTP authentication on cisco IOS 12.1(13).

The ntp configuration is for me good :

ntp authentication-key <key_id> md5 <key>

ntp authenticate

ntp trusted-key <key_id>

ntp source Loopback0

ntp server <ip1> key <key_id> prefer

ntp server <ip2> key <key_id>

A part of Network equipments are synchronized.. No problem :

shor run | i ntp

ntp authentication-key <key_id> md5 <key_md5> 7

It-s good. The is translated in md5..

When we can a "debug ntp authentivation" :

*Mar 16 04:01:00.370 GMT+1:  Authentication key <key_id>

But, other equipments are unsynchronized :

shor run | i ntp

ntp authentication-key <key_id> md5 <key> 0

The number 0 was automatically added in the configuration..

When we can a "debug ntp authentivation" :

*Mar 16 04:01:00.370 GMT+1:  Authentication key  0

---

It is a bad interpretation of the key_id

On this equipments, if i configure :

ntp authentication-key <key_id> md5 <key>

The ntp is synchronized

Can you help me?

Thanks

Regards

Loi

[Richard Burts]

Loi

I am not clear whether you have a problem. You say that the first one works and that :"

On this equipments, if i configure :

ntp authentication-key md5

The ntp is synchronized"

So it sounds like you have it working.

The symptoms that you describe suggest that there was a configuration error in the first attempt to configure the key which you then fixed.

HTH

Rick

[loic.fouray]

Hi,

Thanks Richard for your mail.

We  have the same configuration in two equipement

ntp authentication-key 6 md5 

and  in running configuration show the same line with à 0 like

ntp authentication-key 6 md5   0

so  in one o them ther are a synchronination and unsychronise in  others

when I make a debug ntp authetification, I have

Jul 12  11:28:02.895 GMT+2:  Authentication key 6

in  the synchronized equipement and

Mar 16  04:01:00.370 GMT+1:  Authentication key 0

in  the unsychronised site

so  why did the equipement try to sychronyse with the key 0 sometimes and the key 6  sometimes?

Thanks in advance

Regards

Loic