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Understanding NTP Output

Dear All,

I have a couple of questions about the NTP output from NTP associations detail:-

1) What does "insane, invalid" mean? The server is reachable and a valid NTP sever.

Command output attached

2) The cisco router is attached to a the NTP source shows the source as an NTP Stratum 3 clock, but the router and all other routers show it as a Stratum 4. Yet the router connected to a Stratum 2 clock shows it as a stratum 2 entry.

Command output attached

We had a failure of the secondary NTP server, but lost all NTP updates.


Re: Understanding NTP Output

The word 'insane' means that the ntp packets that are received have failed basic sanity check.

So there seems to be a problem with the packets the router receives from the ntp servers.

To diaognise further,

1. Sniff the network, so that you can have a look at the ntp packets from your servers.

2. Also use 'debug ntp validity' for more information.

Hope this helps for further troubleshooting.

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