This section describes how to monitor the performance of a passive interface. After an SMPTE-2059-2 network achieves stable time synchronization, monitor the offset between the master and slave clocks on the passive interface.
Determining a passive interface: Run the display ptp all command output. If the value of State in Port info of the command output is passive, the interface is a passive interface.
A passive interface does not trace or advertise time information. If a device has multiple master SMPTE-2059-2 interfaces in the same clock domain, the device selects the interface with the highest priority as the master clock. The interface connected to the master clock is the slave clock. In this case, other local interfaces are in the passive state and provide backup for the slave interface. Passive interfaces can send Pdelay_Req, Pdelay_Resp, delay_Resp_Follow_Up, signaling, and management response messages.
A passive interface can be selected as a slave clock or a master clock to participate in time synchronization after a clock source changes. Monitoring the passive interface before a clock source changes helps keep stable time signals on an SMPTE-2059-2 network.
After the router stably synchronizes time signals with a clock source, the router can monitor the performance of its passive interface. The router checks the offset between the master and slave clocks on the passive interface every 300s. If the offset is greater than a configured alarm threshold, the router sends an alarm named hwPtpPassiveFiberLengthChange to NMS.
Perform the following steps on a BC or a TCandBC:
The system view is displayed.
The performance monitoring function is enabled for the passive interface on the SMPTE-2059-2 device.
An alarm threshold is configured for the offset of the passive interface on the SMPTE-2059-2 device.
The configuration is committed.