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Known Limitations

Learn about known limitations in this release for ACX Series routers.

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

General Routing

  • The PTP lock state when a source selection is changing between virtual port and PTP master indicates holdover-in-spec. PR1510880

  • Currently, this metric is not met due to limitations from the microsemi servo code. PR1522796

  • The issue is regarding tuning T1/T4 close to 2 way cTE . Currently, we see around -180 to 200ns cTE . As of now with the current tuning parameters , the critical parameters cTE and 2 way TE is taken care of. As the individual T1/T4 time error will not cause impact to 2 way , cTE , not fixing this. PR1527347

  • The packet time error on ACX5448 chassis with g.8275.2.enh profile is exceeding class-A time error limits of max TE of 100ns. The 1pps time error is exceeding the cTE of 50ns. PR1535434

  • Changing PTP profile type on ACX710 from g.8275.1 to g.8275.2 and vice versa requires a Packet Forwarding Engine reboot and clksyncd restart. PR1546614

  • Configuring rib-group to import or export routes across different routing instance is not supported on DNX(ACX5448) platform. These rib-group imported/exported routes will be of type "rtbl"(rtable). To configure this rtable type routes and do route forwarding in hardware, double route lookup support is required. DNX hardware chipset does not support the double route lookup across two different routing tables. Hence rib-group route import or export across routing instance is not supported on DNX platform. PR1547078

  • In PHASE ALIGNED state , clksyncd restart causes servo to move to FREERUN, but "show ptp clock " will still show GMC Id of connected master since packet exchange is established. PR1548192

  • Ping might fail if the MAC address of the device is modified to a static MAC address as BCM supports only one base MAC address. PR1553472

  • Unified ISSU is not supported on releases prior to Junos OS Release 20.4 to releases 20.4 and above. There is a major SDK upgrade from 6.3.2 to 6.5.16, due to which the Warm boot feature needed for unified ISSU is not supported by our vendor. PR1554915

  • When ACX5448/ACX710 is configured as Two-Way Active Measurement Protocol (TWAMP) server and a client sends a start session message, the response from ACX to send "start session ack" is delayed by 10 seconds, which might cause the session to fail. PR1556829