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Known Limitations
Learn about known limitations in Junos OS Release 21.2R3 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
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On the ACX710 router, sequential increment of both SRC and DST MAC do not provide better load balance as per HASH result. PR1477964
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The packet time error on ACX5448 chassis with g.8275.2.enh profile is exceeding class-A time error limits of maximum TE of 100ns. The 1pps time error is exceeding the cTE of 50ns. PR1535434
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Configuring rib-group to import/export routes across different routing instance is not supported in 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. Therefore, rib-group route import/export across routing instance is not supported in DNX platform. PR1547078
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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
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Unified ISSU is not supported from Junos OS earlier releases to Junos OS Release 20.4 and later. There is a major SDK upgrade from 6.3.2 to 6.5.16, because of which the warm boot feature needed for an unified ISSU is not supported by our vendor. PR1554915
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There is no support for Layer 3 inject in routing instance in ACX5448. BFD packets are Layer 3 injected for PPMAN-based sessions as multihop BFD is PPMAN-based and seeing an issue while transmitting. PR1569443
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EXP to EXP remarking on PHP router will work for default EXP remarking only. Custom EXP remarking will not work on chip. PR1640588
Infrastructure
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The image validation is not supported while upgrading from earlier releases to Junos OS Release 21.2 and later. PR1568757