### JunosE 12.1.0 Release Notes

> ### Release Overview

> These Release Notes cover Release 12.1.0 of the system software for the Juniper Networks E Series Broadband Services Routers and contain the following sections:

> - Release Highlights on page 6
> - Early Field Trial Features on page 10
> - Unsupported Features on page 11
> - Release Software Protocols on page 12
> - SRC Software and SDX Software Compatibility Matrix on page 13
> - Known Behavior on page 14
> - Known Problems and Limitations on page 39
> - Resolved Known Problems on page 56
> - Errata on page 57
> - Appendix A, System Maximums, on page 59

> If the information in these Release Notes differs from the information found in the published documentation set, follow these Release Notes.

> #### Before You Start

> These Release Notes include information about the changes between Releases 12.0.0 and 12.1.0. Before you use your new software, read these Release Notes in their entirety, especially the section Known Problems and Limitations. You need the following documentation to fully understand all the features available in Release 12.1.0:

> - These 12.1.0 Release Notes, which describe changes between Release 12.0.0 and Release 12.1.0
> - The 12.0.0 Release Notes, which describe features available in Release 12.0.0
> - The 12.1.x documentation set, which provides detailed information about features available in Release 12.1.0

> The 12.1.x documentation set consists of several manuals and is available only in electronic format. You can print your own documentation using the PDF and HTML formats available at the Juniper Networks Technical Documentation Web site at www.juniper.net/techpubs. Refer to the following table to help you decide which document to use:

> Task | Document
> --- | ---
> Install the router | ERX Hardware Guide E120 and E320 Hardware Guide
> Learn about modules | ERX Module Guide E120 and E320 Module Guide E Series End-of-Life Module Guide
> Get up and running quickly | E Series Installation Quick Start poster or ERX Quick Start Guide E120 and E320 Quick Start Guide
> Configure the router | JunosE System Basics Configuration Guide
> Configure physical layer interfaces | JunosE Physical Layer Configuration Guide
> Configure link layer interfaces | JunosE Link Layer Configuration Guide
> Configure line module redundancy, stateful SRP switchover, unified ISSU, VRRP, and interchassis redundancy (ICR) | JunosE Service Availability Configuration Guide
> Configure IP, IPv6 and Neighbor Discovery, and interior gateway protocols (RIP, OSPF, and IS-IS) | JunosE IP, IPv6, and IGP Configuration Guide
> Configure IP routing services, including routing policies, NAT, J-Flow statistics, BFD, IPSec, digital certificates, and IP tunnels | JunosE IP Services Configuration Guide
> Configure IP multicast routing and IPv6 multicast routing | JunosE Multicast Routing Configuration Guide
> Configure BGP, MPLS, Layer 2 service, and related applications | JunosE BGP and MPLS Configuration Guide
> Configure policy management | JunosE Policy Management Configuration Guide
> Configure quality of service (QoS) | JunosE Quality of Service Configuration Guide
> Configure remote access | JunosE Broadband Access Configuration Guide
> Get specific information about commands | JunosE Command Reference Guide A to M JunosE Command Reference Guide N to Z
> Monitor system events | JunosE System Event Logging Reference Guide
> Look up definitions of terms used in JunosE technical documentation | JunosE Glossary

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