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Junos OS Release 15.1F4 for the MX Series, PTX Series, and T Series
- Introduction
- Junos OS Release Notes for MX Series 3D Universal Edge Routers and T Series Core Routers
  - New and Changed Features
  - Changes in Behavior and Syntax
  - Known Behavior
    - General Routing
    - Interfaces and Chassis
  - Known Issues
  - Resolved Issues
  - Documentation Updates
  - Migration, Upgrade, and Downgrade Instructions
  - Product Compatibility
    - Hardware Compatibility
- Junos OS Release Notes for PTX Series Packet Transport Routers
  - New and Changed Features
  - Changes in Behavior and Syntax
    - General Routing
    - Network Management and Monitoring
  - Known Behavior
  - Known Issues
  - Resolved Issues
    - Resolved Issues: 15.1F4
    - Resolved Issues: 15.1F3
    - Resolved Issues: 15.1F2
  - Documentation Updates
  - Migration, Upgrade, and Downgrade Instructions
  - Product Compatibility
    - Hardware Compatibility
- Third-Party Components
- Finding More Information
- Requesting Technical Support
- Revision History

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Download this guide: Junos OS Release 15.1F4 for the MX Series, PTX Series, and T Series

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 in Junos OS Release 15.1F4 for the PTX Series.

General Routing

Starting in Junos OS Release 15.1F4, when a user uses the request interface switchover command to switch over the egress traffic from the secondary link, which is already down, to the primary link, the following error message is displayed:
error: ae4 operation not permitted since backup or primary down

Network Management and Monitoring

New 64-bit counter of octets for interfaces (PTX Series)—Starting with Release 15.1F4, Junos OS supports two new Juniper Networks enterprise-specific Interface MIB Extension objects—ifHCIn1SecOctets and ifHCOut1SecOctets—that act as 64-bit counters of octets passing through an interface.