What is NTP master command?

“ntp master” command is used to make the router act as an ntp server with it’s own hardware clock as a source. i.e. not to be used when you have a real ntp server in your network, or when you can sync to a reliable internet source.

Can Cisco switch be NTP server?

Cisco devices can serve as NTP servers, also known as NTP Masters. An NTP Master can utilize either an upstream NTP clock or it’s own internal hardware clock – which may be useful if you’re working in a lab setting not connected to the internet.

Can router be used as NTP server?

When no authoritative time sources are available, and you still need to synchronize clocks throughout a network, you can configure a router to act as an NTP master server. NTP provides two important services, accurate time setting and clock synchronization.

How do I enable NTP on a Cisco router?

To deploy a router as NTP server, following steps are required.

1. Adjust router clock.
2. Configure Loop back interface.
3. Add loopback interface’s network in routing table.
4. Configure NTP Server.
5. Configure active interfaces to act as NTP Server only.

Can a 3750 switch be configured as a NTP Master?

08-25-2009 07:59 AM 3750 switches do not have a hardware clock so cannot be configured to be NTP Master. In similar situations I have connected an otherwise disused Cisco Router which does have such capabilities. 08-24-2009 10:51 AM 08-24-2009 10:51 AM For the 3750 to be a clock source you need : ntp master 2.

How to use the 3750 as a clock source?

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.

What is a typical network example using NTP?

Figure 7-1 shows a typical network example using NTP. Switch A is the NTP master, with the Switch B, C, and D configured in NTP server mode, in server association with Switch A. Switch E is configured as an NTP peer to the upstream and downstream switches, Switch B and Switch F, respectively.

What is a stratum in NTP?

NTP uses the concept of a stratum to describe how many NTP hops away a device is from an authoritative time source. A stratum 1 time server has a radio or atomic clock directly attached, a stratum 2 time server receives its time through NTP from a stratum 1 time server, and so on.