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Junos OS Release Notes for ACX Series

 

These release notes accompany Junos OS Release for the ACX Series. They describe new and changed features, limitations, and known and resolved problems in the hardware and software.

You can also find these release notes on the Juniper Networks Junos OS Documentation webpage, located at https://www.juniper.net/documentation/product/en_US/junos-os .

New and Changed Features

This section describes the new features or enhancements to existing features in Junos OS Release 17.3R3 for ACX Series Universal Metro Routers.

Release 17.3R3 New and Changed Features

There are no new features or enhancements to existing features in Junos OS Release 17.3R3 for ACX Series Universal Metro Routers.

Release 17.3R2 New and Changed Features

There are no new features or enhancements to existing features in Junos OS Release 17.3R2 for ACX Series Universal Metro Routers.

Release 17.3R1 New and Changed Features

Hardware

  • Support for 100 MB Optics (ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000)—Starting in Junos OS Release 17.3R1, ACX Series Universal Metro Routers (ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000) support 100 MB Ethernet optics.

    [See Hardware Compatibility Tool]

Class of Service

  • Support for hierarchical class of service (ACX5000)—Starting in Junos OS Release 17.3R1, ACX5000 line of routers support hierarchical class of service. You can configure up to 8 queues per logical interface. Scheduling properties can be applied at both the physical and logical interface levels. Service providers will be able to support hierarchical class of service at multiple levels to meet the service level agreements and bandwidth allocations for subscribers.

    To enable hierarchical scheduling, include the hierarchical-scheduler CLI statement at the physical interface level.

    Hierarchical class of service can be enabled for Layer 3 VPN, VPLS, and VPWS services.

    [See Hierarchical Class of Service in ACX5000.]

Interfaces and Chassis

  • Support for limiting the number of MAC addresses learned from a logical interface (ACX5000)—Starting in Junos OS Release 17.3R1, you can limit the number of MAC addresses learned from a logical interface on the ACX5000 line of routers. The number of MAC entries learned on a logical interface can be limited by configuring a value for interface-mac-limit. The logical interface MAC limit allows the MAC address table space to be distributed among the different logical interfaces. The MAC limiting can be done for both VPLS and VLAN networks. The limits for a bridge domain and logical port can also be configured at the same time.

    You can configure MAC address limit by enabling the set protocols l2-learning global-no-hw-mac-learning CLI command.

    You can specify a limit for MAC addresses at a logical interface level by configuring a value for the interface-mac-limit CLI command.

    You can use the following show CLI commands to verify this feature:

    • show vlans

    • show protocols

    • show routing-instances

    • show ethernet-switching table

    • show vpls mac-table

    [See Configuring MAC Address Limits on a Logical Interface.]

  • Support for receiving multicast traffic in a VRF domain (ACX Series)—Starting in Junos OS Release 17.3R1, ACX Series routers support multicast traffic to be received in a VRF domain.

    [See Configuring an Interface in the VRF Domain to Receive Multicast Traffic.]

Timing and Synchronization

  • Support for PTP grandmaster clock (ACX500)—Starting in Junos OS Release 17.3R1, ACX500 line of routers supports the PTP grandmaster clock functionality. For an ACX500 router to act as a PTP grandmaster clock, the router needs to receive the timing information from a GPS receiver. ACX500 line of routers supports the integrated GNSS receiver, eliminating the need for an external GPS receiver.

    Note

    The grandmaster functionality is supported only on the ACX500 Indoor routers.

    [See Integrated Global Navigation Satellite System (GNSS) on ACX500 Series Routers and IEEE 1588v2 Precision Timing Protocol (PTP).]

Changes in Behavior and Syntax

This section lists the changes in behavior of Junos OS features and changes in the syntax of Junos OS statements and commands from Junos OS Release 17.3R3 for the ACX Series Universal Metro Routers.

General Routing

  • Support for deletion of static routes when the BFD session goes down (ACX Series)—Starting with Junos OS Release 17.3R1, the default behavior of the static route at the [edit routing-options static static-route bfd-admin-down] hierarchy level is active. So, the static routes are deleted when the BFD receives a session down message.

Interfaces and Chassis

  • Support for logical interfaces—ACX5048 and ACX5096 routers do not support configuring more than 1000 logical interfaces.

Known Behavior

There are no known limitations in Junos OS Release 17.3R3 for the ACX Series.

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

Known Issues

This section lists the known issues in hardware and software in Junos OS Release 17.3R3 for the ACX Series Universal Metro Routers.

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

  • On ACX5000 line of routers, traffic drop is seen after performing ISSU when class of service is configured. PR1299539

Hierarchical Class of Service

  • On ACX5000 line of routers, whenever you make a change to the queue modes and for the changes to take effect you will need to restart the PFE.PR1256465

  • On ACX5000 line of routers, the show class-of-service scheduler-hierarchy CLI command is not supported. PR1261835

  • On ACX5000 line of routers, the show class-of-service interfaces queue logical-interface-name CLI command does not show Queue Buffer Usage for a logical interface. As a workaround, you can use the PFE shell show cos halp mmu buffer ifl command to see the Queue Buffer Usage for a logical interface.PR1272822

  • On ACX5000 line of routers, the shared-buffer maximum CLI statement for logical interface hierarchical class of service queues does not work correctly. PR1275796

Interfaces and Chassis

  • On ACX Series routers, when link-speed is configured, the aggregate interface goes down permanently after the router reboots. PR1022248

Software Installation and Upgrade

  • ISSU upgrade fails on the ACX5000 line of routers when an AE interface with VLAN map operation push, push-push, or pop is configured in a bridge with no VLAN ID. This occurs when the current running Junos OS image is already having an issue, causing the ISSU upgrade to fail. PR1318771

Layer 2 Features

  • On ACX5000 line of routers, in a normal MAC learning mode, when incremental MAC traffic of higher range than the profile is received and after feb restarts, the MAC entries are not seen in the software CLI, although present in the hardware table. As a workaround, in the hardware MAC learning mode, delete the routing instance and reconfigure the routing instance again. In software MAC learning mode, deactivate the routing instance, clear the pending entries or allow the pending entries to be aged out and then activate the routing instance. PR1277436

Router

  • On ACX500 line of routers, performance issues are seen on the ACX500 Indoor AC router. PR1290278

  • On ACX Series routers, at certain instances, the CLI command and syslog shows FAN failure alarms although the fan is running at high speed.

    PR1127846

Resolved Issues

This section lists the issues fixed in the Junos OS main release and the maintenance releases.

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

Reolved Issues: 17.3R3

There are no fixed issues in Junos OS 17.3R1 for ACX Series.

Resolved Issues: 17.3R2

General Routing

  • On ACX Series routers, the DHCP-RELAY requests with IRB interface are not forwarded after upgrade. PR1243687

  • On ACX Series routers, transit ARP packets coming from logical interfaces that are part of a bridge domain or Layer 2 circuit were being sent ("punted") to the Routing Engine. PR1263012

  • On ACX Series router, syslog error was seen on output/egress firewall filter. PR1316588

  • On ACX5000 line of routers, when the management cable was removed, the Fan & PSU Airflow direction mismatch major alarm was seen. PR1327561

Resolved Issues: 17.3R1

Layer 2 Features

  • All the XML duplications and unformatted output are addressed. For Example, histogram was just declared as a element inside pfkey container, with this change a new container is defined for histogram. PR1271648

Documentation Updates

There are no errata or changes in Junos OS Release 17.3R3 for the ACX Series documentation.

Migration, Upgrade, and Downgrade Instructions

This section contains the upgrade and downgrade support policy for Junos OS for the ACX Series Universal Metro Routers. Upgrading or downgrading Junos OS might take several minutes, depending on the size and configuration of the network.

For information about software installation and upgrade, see the Installation and Upgrade Guide.

Upgrade and Downgrade Support Policy for Junos OS Releases

Support for upgrades and downgrades that span more than three Junos OS releases at a time is not provided, except for releases that are designated as Extended End-of-Life (EEOL) releases. EEOL releases provide direct upgrade and downgrade paths—you can upgrade directly from one EEOL release to the next EEOL release even though EEOL releases generally occur in increments beyond three releases.

You can upgrade or downgrade to the EEOL release that occurs directly before or after the currently installed EEOL release, or to two EEOL releases before or after. For example, Junos OS Releases 14.1, 14.2, 15.1 and 16.1 are EEOL releases. You can upgrade from Junos OS Release 14.1 to Release 15.1 or even from Junos OS Release 14.1 to Release 16.1. However, you cannot upgrade directly from a non-EEOL release that is more than three releases ahead or behind.

To upgrade or downgrade from a non-EEOL release to a release more than three releases before or after, first upgrade to the next EEOL release and then upgrade or downgrade from that EEOL release to your target release.

For more information about EEOL releases and to review a list of EEOL releases, see https://support.juniper.net/support/eol/software/junos/.

For information about software installation and upgrade, see the Installation and Upgrade Guide.

Product Compatibility

Hardware Compatibility

To obtain information about the components that are supported on the devices, and the special compatibility guidelines with the release, see the Hardware Guide for the product.

To determine the features supported on ACX Series routers in this release, use the Juniper Networks Feature Explorer, a Web-based application that helps you to explore and compare Junos OS feature information to find the right software release and hardware platform for your network. Find Feature Explorer at https://pathfinder.juniper.net/feature-explorer/.

Hardware Compatibility Tool

For a hardware compatibility matrix for optical interfaces and transceivers supported across all platforms, see the Hardware Compatibility tool.