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Can I configure two ntp servers as a source for a switch?

 

Hey guys,

 

Can I configure two different ntp servers as a time source for my cisco 9500 Switch at the same time? like below? Thanks.

 

ntp server 10.110.70.14 priority 1
ntp server 10.110.70.13 priority 2
ntp enable

 

 

2 REPLIES 2
marce1000
VIP Advisor

 

 - Leave the priority statements aside, the device will use the ntp server offering the best stratum value , 

 M.

joelm
Beginner

You can have as many NTP servers as you want (up to about 15? or so). NTP will poll all of them and figure out the best source of time.

Here's my configuration:

switch#show run | incl ntp
ntp server 98.191.213.2
ntp server 98.191.213.7
ntp server 98.191.213.12 ntp server 98.191.213.14 switch#show ntp associations address ref clock st when poll reach delay offset disp +~98.191.213.2 .GPSD. 1 58 64 377 1.534 0.584 2.441 +~98.191.213.7 .GPS. 1 41 64 377 1.487 0.726 3.865
+~98.191.213.12 .GPSD. 1 10 64 377 1.475 0.643 5.100 *~98.191.213.14 .GPSD. 1 41 64 377 1.934 -0.149 2.877 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured

For the best time, you want to pick NTP servers that are "close" to you, network-wise.

Feel free to use those IPs if you like; they are all in the Public NTP pool and are located in Virginia.