[c-nsp] NTP Config

[Jay Hennigan]

Hitesh Vinzoda wrote:
> I have got 4 6509 cisco in mesh for the core and i want to enable NTP on
> those to act as a master.
> 
> i went thru the config, the only option there is
> 
> config>ntp master stratum 8 ( 8 is the default value )
> 
> does only this command will enable the device to act as a NTP server and
> suggestions are invited for config of NTP in mesh of 6509 with etherchannels
> for redundancy
> of  NTP.

This command will cause the local device to assume that its internal 
local clock/calendar is accurate and advertise it to the rest of the 
network as a (somewhat) accurate time source.  The (somewhat) depends on 
the stratum, lower numbers imply higher accuracy.

If you do this and set the rest of the units to reference this unit as 
an ntp server, all of the clocks will be synchronized *with each other* 
but not with any other authoritative time source.  If your master thinks 
it's January 1982, so will the rest of your network.

You probably want one (or more) of your devices to also reference one 
(or more) time sources of substantially higher authority than the 
crystal oscillator in a 6509.  These can be a local GPS clock, public 
NTP server, WWVB radio clock, etc.

--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
Impulse Internet Service  -  http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV