Junos OS Release Notes for ACX Series
These release notes accompany Junos OS Release 18.1R3 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 features and enhancements in Junos OS Release 18.1R3 for ACX Series routers.
Release 18.1R3 New and Changed Features
There are no new features or enhancements to existing features for ACX Series Universal Metro Routers in Junos OS Release 18.1R3.
Release 18.1R2 New and Changed Features
There are no new features or enhancements to existing features for ACX Series Universal Metro Routers in Junos OS Release 18.1R2.
Release 18.1R1 New and Changed Features
Management
Support for NETCONF over SSH and custom YANG models (ACX Series)—Starting in Junos OS Release 18.1R1, ACX Series routers support NETCONF OVER SSH and custom YANG models.
Client applications can access the NETCONF server using the SSH protocol and use the standard SSH authentication mechanism. After authentication, the NETCONF server uses the configured Junos OS login usernames and classes to determine whether a client application is authorized to make each request.
You can load custom YANG models on the router to add data models that are not natively supported by Junos OS but can be supported by translation. Doing this enables you to extend the configuration hierarchies and operational commands with data models that are customized for your operations. You can load custom YANG modules by using the request system yang add operational command.
[See Understanding the Management of Nonnative YANG Modules on Devices Running Junos OS.]
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 18.1R3 for the ACX Series routers.
Interfaces and Chassis
Modified output of show-ptp-clock command (QFX Series switches)—Starting in Junos OS Release 18.1R1, the output of the show-ptp-clock command is modified to display the value of the GMC Class field as 248 for a PTP boundary clock when the lock state of the clock is Acquiring.
Known Behavior
There are no known limitations in Junos OS Release 18.1R3 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
There are no known issues in hardware and software in Junos OS Release 18.1R3 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.
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.
Resolved Issues: 18.1R3
There are no resolved issues in Junos OS 18.1R3 Release for ACX Series routers.
Resolved Issues: 18.1R2
There are no resolved issues in Junos OS 18.1R2 Release for ACX Series routers.
Resolved Issues: 18.1R1
Alarms
The major alarm about Fan & PSU Airflow direction mismatch was seen by removing management cable PR1327561
Dynamic Host Configuration Protocol
ACX5000 line of routers did not forward DHCP-RELAY requests with IRB interface after upgrade. PR1243687
Firewall Filters
On ACX Series routers, syslog error was seen on the output/egress firewall filter. PR1316588
Installation and Upgrade
fxpc core was observed during ISSU upgrade. PR1318771
Layer 2 Features
On ACX5000 line of routers, transit ARP packets were being punted to the RE. PR1263012
VPN
On ACX5000 line of routers, memory leak was seen during Layer 3 VPN scaling test when committing Layer 3 VPN configuration. PR1115686
Documentation Updates
This section lists the errata and changes in Junos OS Release 18.1R3 for the ACX Series documentation.
New Simplified Documentation Architecture
With the release of Junos OS Release 18.1, Juniper is simplifying its technical documentation to make it easier for you to find information and know that you can rely on it when you find it. In the past, we organized documentation about Junos OS software features into platform-specific documents. In many cases, features are supported on multiple platforms, so you might not easily find the document you want for your platform.
With Junos OS Release 18.1, we have eliminated the platform-specific software feature documents. For example, if you want to find documentation on OSPF, there is only one document regardless of which platform you have. Here are some of the benefits of our new simplified architecture:
Over time, you will see better search results when looking for Juniper documentation. You will be able to find what you want faster and be assured that is the right document.
If a software feature is supported on multiple platforms, you can find information about all the platforms in one place.
Because we have eliminated many documents that covered similar topics, you will now find one document with all the information.
You can know that you are always getting the most current and accurate information.
Migration, Upgrade, and Downgrade Instructions
This section contains the upgrade and downgrade support policy for Junos OS for the ACX Series 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 17.1, 17.2 and 17.3 are EEOL releases. You can upgrade from Junos OS Release 17.1 to Release 17.2 or from Junos OS Release 17.1 to Release 17.3.
You cannot upgrade directly from a non-EEOL release to a 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://www.juniper.net/support/eol/junos.html.
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.