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System Management

  • Support for PTP over Ethernet and hybrid mode over LAG interfaces (MX240, MX480, and MX960)—The MPC2E NG and MPC3E NG line cards support Precision Time Protocol (PTP) over Ethernet and hybrid mode over a link aggregation group (LAG).


    There could be some performance limitations during a switchover from the active line card to the secondary line card and vice versa in a multi-line card scenario because of hardware limitations.

    If an unsupported line card is configured as the primary or secondary interface, the configuration goes through, but an error message is displayed in the output of the show ptp slave/primary CLI command. You must configure only supported line cards (MPC5E and MPC6E) to avoid this issue.

    [See Understanding Hybrid Mode and Precision Time Protocol Overview.]

  • G.8275.1 Telecom profile and PTP over Ethernet encapsulation support (ACX2100 and ACX2200)—Starting in Junos OS Release 21.2R1, ACX2100 and ACX2200 routers support Precision Time Protocol (PTP) over Ethernet encapsulation and G.8275.1 Telecom profile.

    The G.8275.1 Telecom profile supports the architecture defined in ITU-T G.8275 to enable the distribution of phase and time with full timing support. This profile requires all devices in the network to operate in combined or hybrid modes, which means that PTP and Synchronous Ethernet are enabled on all devices.

    PTP over Ethernet enables the effective implementation of packet-based technology that enables the operator to deliver synchronization services on packet-based mobile backhaul networks.

    [See G.8275.1 Telecom Profile and Precision Time Protocol Overview.]

  • Support for PTP SMPTE media profile (QFX5120-48T)—Starting in Junos OS Release 21.2R1, you can enable the Society of Motion Picture and Television Engineers (SMPTE) profile to support video applications to enable capture, video edit, and playback to be used in professional broadcast environments. The standard allows multiple video sources to stay in synchronization across various equipment by enabling time and frequency synchronization to all devices.

    [See Understanding the PTP Media Profiles and Configuring the PTP Media Profiles.]

  • Support for PTP boundary clock and enterprise profile (QFX5120-48T)—Starting in Junos OS Release 21.2R1, you can enable the boundary clock and enterprise profiles, which are based on Precision Time Protocol (PTP) version 2 (PTPv2). The PTP enterprise profile enables the enterprise and financial markets to add a timestamp to the operations of different systems, and to handle a range of latencies and delays. The boundary clock has multiple network connections and can act as a source (primary) and a destination (client) for synchronization messages. It synchronizes itself to a best primary clock through a client port and supports synchronization of remote clock clients to it on primary ports.

    [See Understanding the Precision Time Protocol Enterprise Profile and IEEE 1588v2 PTP Boundary Clock Overview.]