Setting up NTP in home lab

Setting up NTP in home lab
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Subject Author Date
Setting up NTP in home lab darrtech 12-03-2006
Posted by on December 3, 2006, 5:59 pm
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Hey guys, here's the scenario:

I'm using my laptop as a NTP server IP 10.10.10.25. Everything connects
to a L2\L3 3550 trunked IP 10.10.10.35 VLAN1. without sacrificing a
dedicated interface on each router for time management how do I get the
routers to sync-up with the laptop using just a loopback int.

Objective: to automatically sync up the routers with the NTP server
every time I start my lab. Without dedicating an eth port for NTP.


Thanks


Posted by Merv on December 4, 2006, 4:31 am
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you could see if one of the routers or switches will behave as NTP
master in a backup role.

Determine the NTP of the pc and then configure the stratunm on the
router to be 1 less

ntp server <IP address of PC> ! assuming stratumn of 4 on PC
ntp master 6 ! this oruter will become NTP
master if there is no connectivity to PC


Posted by Merv on December 4, 2006, 7:52 am
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also see if router or switch in question supports command

ntp update calendar


Posted by on December 4, 2006, 3:19 pm
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Merv wrote:
> also see if router or switch in question supports command
>
> ntp update calendar

Still I would have to dedicate a port on each router for connectivity
to the master. And this is what I don't want to do. I would like to
sync up the routers to a time source {PC or router master} with a
logical loopback interface. That way I don't lose a physical port to
maintain it.


Posted by Merv on December 4, 2006, 4:00 pm
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Are the devices in your lab not interconnected ? will they not have IP
connectivity ?

NTP does not require dedicated interfaces - it simply transmits UDP
traffic using UDP port 123


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