User Guide > gPTP

gPTP Domains

Currently, every separate Ethernet network comprised of a number Switches and their connected Hosts can be defined to be a gPTP domain. The clock time of the selected grandmaster Host will den be distributed to the other slave Hosts of the network achieving time synchronization between the nodes.

Version 3.0 of TCN TimeAnalysis introduces initial support for the IEEE 802.1AS generalized precision time protocol (gPTP). Based on IEEE 1588, this standard is better optimized for time-sensitive applications. Currently, an Ethernet network comprised of a number Switches and the Hosts connected to them can be defined as gPTP domain. One of the Hosts (Host1 in the figure below) is selected as containing the grandmaster clock and the time of this clock is then distributed across the network by the gPTP protocol to all the slave Hosts in the network achieving time synchronization between these nodes.

To add a new gPTP Domain to your system model, right-click on Host that will act as the Grand Master and select Add gPTP Domain.

This will open the Switch dialog:

Device

This column lists the names of the Hosts and Switches that are included in a specific gPTP domain.

Port

This column lists the device Ports that connects the Hosts and Switches that are part of the gPTP domain.

State

This column shows the gPTP Port states that have been configured to force the desired Grandmaster Host and to construct a desired time-synchronization spanning tree with the Grandmaster Host as the root.

Master

Any Port, P, of a Host or Switch that is closer to the root of the spanning tree than any other Port of the gPTP communication path connected to P.

Slave

The one Port of a Host or Switch that is closest to the root Host.

Passive

Any Port of a Host or Switch whose Port state is not Master, Slave, or Disabled.

Disabled

The state of any Port that is not connected.

Drift

This parameter defines the speed of a Host’s local clock as compared to the speed of a global clock present during a simulation.

Show Path

To visualize a particular gPTP Domain, please see the View Mode section.

Actions

The following actions are available for existing VLANs - right-click on a VLAN in the the Tree View:

     
Edit Opens the Domain dialog in edit mode.
Delete Removes the Domain from the topology.
View Visualize the gPTP Domain, please see the View Mode section.