Viewing the PTP Foreign Source Details

Use the PTP Foreign Source page to view the PTP details of the source leader in a bidirectional clock relationship (formerly master) that is learned by a port. The foreign source record will be available only when a port is in the receiver follower in a bidirectional clock relationship (formerly slave) state. To view this page, go to Settings > Date and Time > PTP Foreign Source.

In Figure 1, you can see that there is no foreign sourcerecord for the port 1/1/c13 because the port is in the source state. Whereas, the foreign source record appears for the port 1/1/c29, which is in the receiver state.

Figure 63

PTP Foreign Source Details

Following table lists the PTP foreign source attributes and their descriptions:

PTP Foreign Source Attribute	Description
Port ID / Port Alias	The port identifier.
Box ID	The box identifier of the device.
Best Source	The best source clock for the device.
Port Identity	The clock identity of the foreign source that the port has learned.
Primary Source Priority2	The priority value of the primary source root timing; transmits sync info to clocks in its network segment (formerly grandmaster) that is used when Primary source Priority1 value is the same for different sources in a network.
Announce Msg Count	The total number of announce messages that were sent and received by the port.
Steps Removed	The number of boundary clocks between the local clock and the foreign source clock.
Primary Source Clock Identity	The clock identity of the primary source. It is a 64-bit global identifier (EUI-64) as defined by the IEEE standard.
Port Module Number	The module number of the physical port.
Port Number	The physical port identifier.
PTP Protocol	The protocol used by the PTP is IPv4 Ethernet.
Clock Address	The IP address that is derived based on the clock ID.
Primary Source Priority1	The priority value of the primary source clock. Lower value takes precedence.
Last Sync	The time when the last synchronization message was sent by the foreign source to the receiver.
Last Follow Up	The time when the last follow-up message was sent by the receiver to the foreign source.
Last Delay Response	The time when the last delay response was sent by the foreign source to the receiver.
Mtsd Scaled Avar	MTSD-scaled Allan variance (nsec-sq).
Quality Class	The traceability of the time or frequency distributed by the foreign source clock.
Quality Offset	The log variance field of the announce message.
Quality Accuracy	The clock accuracy indicates the expected accuracy of the foreign source clock.