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Known Limitations in Junos OS Release 12.3 for ACX Series Routers

The following software limitations currently exist in Juniper Networks ACX Series Universal Access Routers. The identifier following the descriptions is the tracking number in the Juniper Networks Problem Report (PR) tracking system.

Class of Service

  • When the rewrite-rules statement is configured with the dscp or the inet-precedence options at the [edit class-of-service interfaces] hierarchy level, the expectation is that the DiffServ code point (DSCP) or IPv4 precedence rewrite rules take effect only on IP packets. However, in addition to the IP packets, the DSCP or IPv4 rewrite takes effect on the IP header inside the Ethernet pseudowire payload as well. [PR664062: This is a known limitation.]

Firewall Filters

  • On ACX Series routers, packet drops in the egress interface queue are also counted as input packet rejects under the Filter statistics section in the output of the show interface extensive command when it is run on the ingress interface. [PR612441: This is a known software limitation.]
  • When the statistics statement is configured on a logical interface, for example [edit interface name-X unit unit-Y ], when the (policer | count | three-color-policer) statements are configured in a firewall filter for the family any, for example the [edit firewall family any filter filter-XYZ term term-T then] hierarchy level, and the configured filter-XYZ is specified in the output statement of the above logical interface at the [edit interface name-X unit unit-Y filter] hierarchy level, the counters from the configuration of another firewall family filter on the logical interface do not work. [PR678847: This is a known limitation.]
  • The policing rate can be incorrect if the following configurations are applied together:
    • The policer or three-color-policer statement configured in a firewall filter, for example filter-XYZ at the [edit firewall family any filter filter-XYZ term term-T then] hierarchy level, and filter-XYZ is specified as an ingress or egress firewall filter on a logical interface, for example interface-X unit-Y at the [edit interface interface-X unit unit-Y filter (input|output) filter-XYZ] hierarchy level.
    • The policer or three-color-policer statement configured in a firewall filter, for example filter-ABC at the [edit firewall family name-XX filter filter-ABC term term-T then] hierarchy level, and filter-ABC is configured as an ingress or egress firewall filter on a family of the same logical interface interface-X unit-Y at the [edit interface interface-X unit unit-Y family name-XX filter (input|output) filter-ABC] hierarchy level.

    Note: If one of these configurations is applied independently, then the correct policer rate can be observed.

    [PR678950: This is a known limitation.]

Interfaces and Chassis

  • The ACX Series routers support logical interface statistics, but do not support the address family statistics. [PR725809: This is a known limitation.]
  • When the differential-delay number option is configured in the ima-group-option statement at the [edit interfaces at-fpc/pic/ima-group-no] hierarchy level, with a value less than 10, some of the member links might not come up and the group might remain down resulting in traffic loss. A workaround is to keep the differential delay value above 10 for all IMA bundles. [PR726279: This is a known limitation.]
  • BERT error insertion and bit counters are not supported by the IDT82P2288 framer. [PR726894: This is a known limitation.]
  • The discard error is displayed when a Layer 2 pseudowire is configured with VLAN ID 0 on an NNI interface. The ACX4000 does not support VLAN ID 0 on the NNI interface. [PR727276: This is a known limitation.]
  • All 4x supported TPIDs cannot be configured on different logical interfaces of a physical interface. Only one TPID can be configured on all logical interfaces, that is, sub-interfaces of a physical interface. But different physical interfaces can have different TPIDs. As a workaround, use TPID-rewrite. [PR738890: This is a known limitation.]
  • The ACX Series routers do not support logical interface statistics for those logical interfaces with vlan-list/vlan-range. [PR810973: This is a known limitation.]
  • CFM up-mep session (to monitor PW service) does not come up when output vlan-map is configured as push on AC ifl. This is due to a hardware limitation in Enduro-2. [PR832503: This is a known limitation.]

MPLS

  • The scaling numbers for pseudowires and MPLS label routes published for the ACX Series routers are valid only when the protocols adopt graceful restart. In case of nongraceful restart, the scaling numbers would become half of the published numbers. [PR683581: This is a known limitation.]

Modified: 2016-06-09

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