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Precision Time Protocol (PTP)

  • Memory logging infrastructure for enhanced timing application debugging (MX240, MX480, MX960, MX2010, and MX2020)—Enhance your network's debugging capabilities with the Memory Logging Infrastructure for timing applications. This feature enables you to log and categorize critical and operational events, improving system resilience and troubleshooting efficiency. You can manage logs through specific CLI commands and configure options like dump-on-wrap to maintain log records during system restarts. By utilizing this infrastructure, you streamline memory logging across platforms, ensuring comprehensive performance management and operational visibility, particularly with timing processes such as clksyncd and clksyncm.

    [See Understanding Memory Logging Infrastructure for Timing Applications.]

  • Phase adjustment mitigation for G.8275.1 hybrid mode (MX240, MX480, MX960, MX2010, and MX2020)—Use the phase adjustment mitigation feature to protect downstream timing from GNSS-induced phase jumps in hybrid deployments. This feature prevents phase adjustments to downstream Precision Time Protocol (PTP) nodes caused by a significant phase jump of the upstream T-GM or T-BC PTP node. Use the protocols ptp phase-error-limit relative-threshold <nanoseconds> configuration statement to ignore phase adjustments that exceed the threshold, with SNMP traps and syslogs for visibility. Optionally, use protocols ptp phase-error-limit force-synce-holdover and protocols ptp phase-error-limit max-holdover-time <minutes> to place PTP and Synchronous Ethernet in holdover and control duration. The system applies a ten-measurement-window grace period before resuming adjustments. Monitor status with show ptp phase-error-monitoring status and show ptp global-information commands. This control applies to PTP-originated adjustments.

    [See Phase Adjustment Mitigation in Hybrid Mode.]

  • PTP passive port monitoring with SNMP MIB support and timeReceiver performance monitoring (MX304)—You can enhance router performance monitoring through Precision Time Protocol (PTP) passive port monitoring and SNMP MIB integration. Use show ptp global-information and show ptp passive-port-monitor-status commands to display performance statistics. Passive monitoring alerts you to potential fiber asymmetries or clock failures, improving network reliability by identifying issues when phase thresholds are exceeded.

    TimeReceiver performance monitoring feature allows you to collect detailed metrics for active PTP timeReceiver ports using IEEE 1588-2019 standards, including timeTransmitter–timeReceiver delay and synchronize message transmission. Use the show ptp performance-monitor status command to view the status of timeReceiver port performance monitoring.

    [See PTP Passive Port Performance Monitoring and PTP TimeReceiver Port Performance Monitoring.]

  • Support for PTP G.8275.2 enhanced profiles for Telecom phase and time synchronization (MX10008 and MX10004 with JNP10K-LC9600 line cards)—You can enable Precision Time Protocol (PTP) G.8275.2 enhanced profiles to achieve compliance with ITU-T G.8273.4 standards for precise phase and time synchronization in Telecom applications. This feature supports PTP over both IPv6 and IPv4 unicast, ordinary and boundary clocks, and unicast negotiation, facilitating accurate synchronization over wide area networks. To configure this enhanced profile, enable the g.8275.2.enh statement in the [edit protocols ptp profile-type] CLI hierarchy.

    [See G.8275.2 Enhanced Profile.]

  • Support for PTP over IRB for G.8275.2 profile (MX10004 and MX10008 with JNP10K-LC480 line cards)—Precision Time Protocol (PTP) over Integrated Routing and Bridging (IRB) for G.8275.2 profile enables precise timing synchronization in Remote PHY deployments by allowing PTP timeTransmitter configuration on IRB interfaces. This feature supports clustered remote PHY devices (RPD) environments with a single PTP timeTransmitter serving multiple timeReceivers, aggregated Ethernet integration within bridge domains, and redundancy through primary/secondary link configuration. It ensures telecom-grade synchronization for Data-over-Cable Service Interface Specification (DOCSIS) and emerging services like wireless backhaul.

    [See PTP over IRB for G.8275.2 Enhanced Profile.]

  • Support for Synchronous Ethernet, Synchronous Ethernet over LAG, G.8275.1, and G.8275.1 over LAG (MX10004 and MX10008 routers with JNP10K-LC4802 line card)—Use Synchronous Ethernet and G.8275.1 over Link Aggregation Groups (LAG) on MX10004 and MX10008 routers equipped with JNP10K-LC4802 line cards to enhance network performance, stability and redundancy. Synchronous Ethernet provides precise frequency synchronization over Ethernet networks for time-sensitive applications, ensuring stable and reliable communication. Link Aggregation Group (LAG) increases bandwidth and provides redundancy by combining multiple physical links into a single logical connection. This enhances network performance and ensures high availability in case one link fails.

    The G.8275.1 profile, based on ITU-T G.8275, enables the distribution of phase and time with full timing support. Operate all devices in combined or hybrid mode, where both Precision Time Protocol (PTP) and Synchronous Ethernet are enabled.

    [See, Timing Features with JNP10K-LC480 and JNP10K-LC4800 Line Cards on MX10004 and MX10008.]