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Known Limitations

Learn about limitations in this release for ACX Series routers.

For the most complete and latest information about known Junos OS Evolved defects, use the Juniper Networks online Junos Problem Report Search application.

General Routing

  • When the original flow is egressing out through an AE interface, the corresponding sampled sflow frame does not reflect the correct egress port number. This happens only when the flow is egressing out through an AE interface. For non-AE egress interface, this works fine and the sflow frame reflects the correct egress port.PR1647870

  • With T-GM(Timing - Grand Master) enabled system like ACX7024, ACX7348 and ACX7332, when master port link comes up late, then PTP system servo state can move from INITIALIZING to PHASE ALIGNED. This will not cause any issue since when in INITIALIZING state, no PTP packets are sent to down streams devices and in PHASE ALIGNED state, PTP packets are sent with all correct clock parameters. When system moves to directly PHASE_ALIGNED, it is assured that the system is internally locked to phase and frequency of GNSS.PR1887028

  • ACX7348 and ACX7332: Transient traffic loss is observed after PTP is enabled.PR1904131

  • This PR is covering two behaviours of AFTS node. 1. During the system's transition from GNSS to hybrid mode, multiple phase spikes may occasionally be observed. However, these spikes remain within the acceptable threshold of 260 nanoseconds, and therefore, the performance is considered to be within the permissible operational range. 2. Rare Phase Jump Events In very rare scenarios, a phase jump exceeding 260 nanoseconds may occur. These events are momentary in nature, and observations indicate that the system recovers immediately.PR1908744

  • As per GNSS receiver vendor, this issue has happened due to the sudden temperature changes affecting the GF-8801 unit which uses TCXO oscillator. Please refer to the attached plot (https://gnats.juniper.net/web/default/1908802/attachments/GF_8801_Temp_vs_ Freq_Mode_Change.png) for detailed analysis. GF-8801 includes one TCXO to generate 10MHz and this TCXO can also be drifted suddenly when sudden ambient temperature changes or strong air flow directly impact GF-8801.PR1908802

  • In an infrequent case scenario, the system will be stuck in the acquiring state when asymmetry is configured on the primary LAG(400G). And the way to recover from the issue is to restart the fpc slot where the 400G port is present.PR1909225