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Known Behavior in Junos OS Release 12.3 for M Series, MX Series, and T Series Routers

This section contains the known behavior, system maximums, and limitations in hardware and software in Junos OS Release 12.3R11 for the M Series, MX Series, and T Series.

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

Class of Service (CoS)

  • If you define more than one forwarding class for a given queue number, do not use the name of a default forwarding class for one of the new classes, because doing so causes the forwarding class with the default name to be deleted. For example, do not configure the following, because doing so deletes the best-effort class:
    user@host# set class-of-service forwarding-classes class be queue-num 0user@host# set class-of-service forwarding-classes class best-effort queue-num 0user@host# commit


  • Support for MIC-3D-8OC3-2OC12-ATM Revision 22 and later—MIC-3D-8OC3-2OC12-ATM Revision 22 is supported only by the following Junos OS releases:
    • Junos OS Release 12.3—12.3R9 and later
    • Junos OS Release 13.3—13.3R6 and later
    • Junos OS Release 14.1—14.1R4 and later
    • Junos OS Release 14.2—14.2R3 and later
    • Junos OS Release 15.1 and later

    You must upgrade to a supported Junos OS release to use MIC-3D-8OC3-2OC12-ATM Revision 22 and later.


  • Removal of SRLG from the SRLG table only on the next reoptimization of the LSP—If an SRLG is associated with a link used by an ingress LSP in the router, then on deleting the SRLG configuration from that router, the SRLG gets removed from the SRLG table only on the next reoptimization of the LSP. Until then, the output displays Unknown-XXX instead of the SRLG name and a nonzero srlg-cost of that SRLG for the run show mpls srlg command.

Routing Policy and Firewall Filters

  • On MX Series, subscriber management uses firewall filters to capture and report the volume-based service accounting counters that are used for subscriber billing. You must always consider the relationship between firewall filters and service accounting counters, especially when clearing firewall statistics. When you use the clear firewall command (to clear the statistics displayed by the show firewall command), the command also clears the service accounting counters that are reported to the RADIUS accounting server. For this reason, you must be cautious in specifying which firewall statistics you want to clear. When you reset firewall statistics to zero, you also zero the counters reported to RADIUS.

Software Installation and Upgrade

  • Downgrading to Junos OS 12.3 when the configuration includes the targeted-distribution statement—In Junos OS Release 12.3, the targetted-distribution statement at the [edit interfaces demux0 unit logical-unit-number] hierarchy level is misspelled. Starting in Junos OS Release 13.3, the spelling for this statement is corrected to targeted-distribution. If you use the misspelled targetted-distribution statement in Junos OS Release 13.3 or higher, the CLI corrects the spelling to targeted-distribution in your configuration, so existing scripts still work. The correct spelling is not backward compatible; Junos OS Release 12.3 supports only the targetted-distribution spelling. If you downgrade from Release 13.3 or higher to Release 12.3, all correctly spelled targeted-distribution statements are removed from the configuration and configuration scripts with the correct spelling fail.

Related Documentation

Modified: 2016-06-09