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Synchronizing the System Time in the

Network

146

7.4

Interaction of PTP and SNTP

UM Basic Configuration L3P

Release

7.1

12/2011

 Application Example

The requirements with regard to the accuracy of the time in the network

are quite high, but the terminal devices only support SNTP (see fig. 32).

In the example, the left device, as an SNTP client, gets the time from the

NTP server via SNTP. The device assigns PTP clock stratum 2 (PTPv1)

or clock class 6 (PTPv2) to the time received from an NTP server. Thus

the left device becomes the reference clock for the PTP synchronization.

PTP is active for all 3 devices, thus enabling precise time synchronization

between them. As the connectable terminal devices in the example only

support SNTP, all 3 devices act as SNTP servers.

Device 149.218.112.1 149.218.112.2 149.218.112.3

PTP

Operation on on on

Clock Mode v1-boundary-clock v1-boundary-clock v1-boundary-clock

Preferred Master false false false

SNTP

Operation on on on

Client Status on off off

External server address 149.218.112.0 0.0.0.0 0.0.0.0

Server request interval any any any

Accept SNTP Broadcasts No No No

Server status on on on

Anycast destination address 224.0.1.1 224.0.1.1 224.0.1.1

VLAN ID 1 1 1

Anycast send interval 30 30 30

Table 11: Settings for the example

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