Help with NTP on a new Cisco 3850 switch

Hello All,
Hello All,

We put in a new Cisco 3850 this last weekend.  The switch is working fine except for NTP.  The new switch is supposed to be the NTP server for the network.  However, other switches and servers are not syncing with the new switch, and I'm not seeing what the issue is.  The new switch is syncing with the atomic clock fine.  Below is the configuration for NTP on the new switch.


SW3850#show run | i ntp
ntp source Vlan2
ntp access-group peer 10
ntp access-group serve-only 20
ntp master
ntp server 192.43.244.18 source Vlan2
ntp server 132.163.4.101 prefer source Vlan2
ntp server 132.163.4.102 source Vlan2
ntp server 132.163.4.103 source Vlan2


Regards,
Nick Dalmolin
LVL 1
ndalmolin_13Asked:
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Craig BeckCommented:
Can you post ACL 10 and 20 too please?
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FideliusCommented:
Hello,

Remove command ntp master. By default, if this switch is configured with the external NTP server, it will act as NTP Master for the rest of devices in your network which point to it as NTP server.

Here is explanation of command:
http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/command/reference/ffun_r/frf012.html#wp1123474

Regards!

Fidelius
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Craig BeckCommented:
Fidelius is right, but that wont 'stop' clients connecting to the switch as a ntp client.  It just forces the switch to give the time to clients from its own hardware clock.
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FideliusCommented:
I agree. But ntp master command sometimes makes trouble. As it is not needed in this case, it is better to remove it, before further troubleshoot
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Craig BeckCommented:
The only trouble I've ever had with ntp master is when you have more than one in your network.  This can cause stratum issues and loss of sync.  I do agree though, it's not required - I was just mentioning that it won't stop devices from syncing as clients.
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ndalmolin_13Author Commented:
Thanks all for the help.  Apologies for not getting back to this sooner.  I was out of the office last week.
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Craig BeckCommented:
So did the chosen answer work?
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