12-08-2005 07:17 AM - edited 03-03-2019 01:04 AM
I cannot get any of my Cisco switches to sync with an NTP server. I have configured a Windows Server to be the NTP server for all of my network equipment but it will not work. Here is the config:
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname xxxxxxxx
!
enable secret 5 XXXXXXXXXXXXXXXXXXXXX
!
no aaa new-model
ip subnet-zero
ip domain-name XXXXXXXXX
!
!
mls qos
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
class-map match-any 3megIN_OUT
match ip dscp default
class-map match-any 7.5megIN_OUT
match ip dscp default
class-map match-any 15megIN_OUT
match ip dscp default
!
!
policy-map 3megIN_OUT
class 3megIN_OUT
police 3000000 375000 exceed-action policed-dscp-transmit
policy-map 7.5megIN_OUT
class 7.5megIN_OUT
police 7496000 937500 exceed-action policed-dscp-transmit
policy-map 15megIN_OUT
class 15megIN_OUT
police 15000000 1000000 exceed-action policed-dscp-transmit
!
interface Vlan1
no ip address
shutdown
!
interface Vlan37
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
no ip route-cache
!
ip default-gateway xxx.xxx.xxx.xxx
ip classless
ip http server
!
!
control-plane
!
banner motd ^CYou are about to access xxxxxxxxxxxxxxxxxxxx.
All access is controlled. Unauthorized access is a violation
of Federal and State law and company policy.
Information systems, data and information are xx assets for
xx business use only.^C
!
line con 0
password xxxxxxxx
login
line vty 0 4
password xxxxxxxx
login
line vty 5 15
password xxxxxxxx
no login
!
ntp server xxx.xxx.45.167
!
end
xxxxxxxxxx#sho ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 119.2092 Hz, actual freq is 119.2092 Hz, precision is 2**17
reference time is 00000000.00000000 (19:00:00.000 EST Thu Dec 31 1899)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.00 msec, peer dispersion is 0.00 msec
xxxxxxxxxx#sho ntp ass
address ref clock st when poll reach delay offset disp
~xxx.xxx.45.167 207.46.130.100 3 7 64 3 0.9 -84160 7879.3
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
12-08-2005 07:34 AM
Hi,
wouldn´t you need additionally something like:
clock timezone gmt
ntp source Loopback0
ntp update-calendar
ntp server xxx.xxx.45.167
Do you use authentication on your NTP server?
The use on the Switch:
ntp authentication-key 10 md5 MyNTPpassword
ntp authenticate
ntp trusted-key 10
Regards
Martin
12-08-2005 08:28 AM
Hello,
I might be off course here, but I seem to remotely remember having a similar problem, eventually I configured SNTP instead of NTP:
sntp server xxx.xxx.45.167
I think for Windows to work as an NTP server, you have to install a package like this:
PresenTense Time Server
Regards,
GP
12-08-2005 09:25 AM
Georg
You are quite on course. The implementation of time service in Windows is based on SNTP. And Cisco devices running NTP will not sync with an SNTP server. So running SNTP on Cisco is an option.
Martin's suggestion about specifying time zone is nice but not necessary to being able to sync. And his suggestions about doing things like authentication of NTP are good practice, assuming that you are using the NTP service rather than the SNTP.
HTH
Rick
12-09-2005 12:12 AM
Rick,
That is useful information. Thanks. One question: will it do it OK the other way. That is, if I have set my router as NTP master (not SNTP), can I get the Windows domain to synchronise from it?
Kevin Dorrell
Luxembourg
12-09-2005 07:17 AM
Yes. We use our Internet-facing router to acquire stratum 1 time, then our core switch acquires time from the router, and the rest of the network gets it from the core switch. Bottom line -- Cisco devices can play NTP among themselves with no problems.
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