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Time Synchronisation between a Cisco Catalyst 6500 switch and Active Directory

Script
– 6500 switch is the corporate NTP server
– Server team wants to synchronize Active Directory time with the NTP server.

Troubleshooting

  • enable NTP debugs:

  • check logs on the 6500 switch:

It seemed that there’s a “passive/active” concept in NTP :)

Solution
 The 6500 switch supports both NTP active and passive modes. By default, it only accepts NTP active mode.
We need to enable NTP passive mode on the 6500 switch.

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