I have a contained environment where I just want my servers all to have the same time. I want them to pull that time from my 3750. What do I have to enable on the 3750 to be the NTP clock source.
Keep in mind that the 3750 will not be getting the source from anywhere else, just my "set clock" command.
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For the 3750 to be a clock source you need : ntp master 2.
The stratum 1 should be used only if you are using a GPS clock.
So here in this example it's stratum 2.
Also you need ntp source interface X/X if you want to use a specific interface for sourcing ntp.
On the other devices, use the ntp server a.b.c.d where a.b.c.d is the ip address of the 3750.
What is the actual command?
I put in NTP MASTER and get an unrecognized command. I am going through Cisco docs and can't find anything on this.
Its working on my 3750. Are you in config mode?
Cisco IOS Software, C3560 Software (C3560-ADVIPSERVICESK9-M), Version 12.2(44)SE5, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Thu 22-Jan-09 05:47 by gereddy
Image text-base: 0x01000000, data-base: 0x02900000
ROM: Bootstrap program is C3560 boot loader
BOOTLDR: C3560 Boot Loader (C3560-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc2)
SW1 uptime is 13 weeks, 3 days, 17 hours, 30 minutes
System returned to ROM by power-on
System image file is "flash:/c3560-advipservicesk9-mz.122-44.SE5.bin"
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cisco WS-C3560-24TS (PowerPC405) processor (revision E0) with 131072K bytes of memory.
Processor board ID CAT1114RK0S
Last reset from power-on
1 Virtual Ethernet interface
24 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:1B:8F:F7:B5:80
Motherboard assembly number : 73-9897-06
Power supply part number : 341-0097-02
Motherboard serial number : CAT11145KLR
Power supply serial number : AZS110721FN
Model revision number : E0
Motherboard revision number : B0
Model number : WS-C3560-24TS-S
System serial number : CAT1114RK0S
Top Assembly Part Number : 800-26160-02
Top Assembly Revision Number : E0
Version ID : V02
CLEI Code Number : COMMG00ARB
Hardware Board Revision Number : 0x01
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 WS-C3560-24TS 12.2(44)SE5 C3560-ADVIPSERVICESK9-M
Configuration register is 0xF
Enter configuration commands, one per line. End with CNTL/Z.
access-group Control NTP access
authenticate Authenticate time sources
authentication-key Authentication key for trusted time sources
broadcastdelay Estimated round-trip delay
clock-period Length of hardware clock tick
logging Enable NTP message logging
max-associations Set maximum number of associations
peer Configure NTP peer
server Configure NTP server
source Configure interface for source address
trusted-key Key numbers for trusted time sources
If the ntp command is not showing like on my switch, you may need an ip services image or higher.
I get the list of commands but it doesnt allow me to set it as a master. If I want it to be the NTP server then how do I make it that? And can I do it if it is only using its own clock to server NTP time?
The 3750 switches does have NTP.
sh ntp status
sh ntp associations