1 Release Notes: Junos® OS Release 19.3R3 for the ACX Series, EX Series, MX Series, NFX Series, PTX Series, QFX Series, SRX Series, and Junos Fusion 15 July 2021 Contents Introduction | 10 Junos OS Release Notes for ACX Series | 10 What's New | 11 What's New in Release 19.3R3 | 11 What's New in Release 19.3R2 | 11 What’s New in Release 19.3R1-S1 | 11 What's New in Release 19.3R1 | 12 What's Changed | 19 What’s Changed in Release 19.3R3-S1 | 20 What's Changed in Release 19.3R3 | 20 What's Changed in Release 19.3R2-S6 | 20 What's Changed in Release 19.3R2 | 21 What's Changed in Release 19.3R1 | 21 Known Limitations | 23 General Routing | 23 Open Issues | 25 General Routing | 25 Platform and Infrastructure | 27 Virtual Chassis | 27 2 Resolved Issues | 27 Resolved Issues: 19.3R3 | 28 Resolved Issues: 19.3R2 | 30 Resolved Issues: 19.3R1 | 31 Documentation Updates | 34 Migration, Upgrade, and Downgrade Instructions | 35 Upgrade and Downgrade Support Policy for Junos OS Releases | 35 Junos OS Release Notes for EX Series Switches | 37 What's New | 37 What's New in 19.3R3 | 38 What's New in 19.3R2 | 38 What's New in 19.3R1 | 39 What's Changed | 47 What's Changed in 19.3R3 | 48 What's Changed in Release 19.3R2-S6 | 49 What's Changed in 19.3R2 | 50 What's Changed in 19.3R1 | 50 Known Limitations | 51 EVPN | 52 Infrastructure | 52 Platform and Infrastructure | 52 Open Issues | 53 Authentication and Access Control | 53 Infrastructure | 53 Interfaces and Chassis | 54 Layer 2 Features | 54 Network Management and Monitoring | 54 Platform and Infrastructure | 54 Virtual Chassis | 55 Resolved Issues | 56 Resolved Issues: 19.3R3 | 56 Resolved Issues: 19.3R2 | 61 Resolved Issues: 19.3R1 | 63 Layer 2 Ethernet Services | 64 3 Network Management and Monitoring | 64 Platform and Infrastructure | 64 Routing Protocols | 67 Subscriber Access Management | 68 User Interface and Configuration | 68 Virtual Chassis | 68 VPNs | 68 Documentation Updates | 68 Migration, Upgrade, and Downgrade Instructions | 69 Upgrade and Downgrade Support Policy for Junos OS Releases | 69 Junos OS Release Notes for Junos Fusion Enterprise | 70 What’s New | 71 What's New in Release 19.3R3 | 71 What's New in Release 19.3R2 | 71 What's New in Release 19.3R1 | 71 What’s Changed | 72 Known Limitations | 72 Open Issues | 73 Junos Fusion for Enterprise | 73 Resolved Issues | 74 Resolved Issues: 19.3R3 | 74 Resolved Issues: 19.3R2 | 74 Resolved Issues: 19.3R1 | 74 Documentation Updates | 75 Migration, Upgrade, and Downgrade Instructions | 75 Basic Procedure for Upgrading Junos OS on an Aggregation Device | 76 Upgrading an Aggregation Device with Redundant Routing Engines | 77 Preparing the Switch for Satellite Device Conversion | 78 Converting a Satellite Device to a Standalone Switch | 79 Upgrade and Downgrade Support Policy for Junos OS Releases | 79 Downgrading from Junos OS | 80 4 Junos OS Release Notes for Junos Fusion Provider Edge | 81 What's New | 81 What's New in Release 19.3R3 | 82 What's New in Release 19.3R2 | 82 What's New in Release 19.3R1 | 82 What's Changed | 82 Known Limitations | 83 Junos Fusion Provider Edge | 83 Open Issues | 84 Junos Fusion Provider Edge | 84 Resolved Issues | 85 Resolved Issues: 19.3R3 | 85 Resolved Issues: 19.3R2 | 85 Resolved Issues: 19.3R1 | 85 Documentation Updates | 86 Migration, Upgrade, and Downgrade Instructions | 86 Basic Procedure for Upgrading an Aggregation Device | 87 Upgrading an Aggregation Device with Redundant Routing Engines | 89 Preparing the Switch for Satellite Device Conversion | 90 Converting a Satellite Device to a Standalone Device | 91 Upgrading an Aggregation Device | 94 Upgrade and Downgrade Support Policy for Junos OS Releases | 94 Downgrading from Junos OS Release 19.3 | 94 Junos OS Release Notes for MX Series 5G Universal Routing Platform | 95 What's New | 96 What’s New in Release 19.3R3 | 96 What’s New in Release 19.3R2 | 96 What’s New in Release 19.3R1 | 115 What's Changed | 134 What’s Changed in Release 19.3R3-S1 | 135 What’s Changed in Release 19.3R3 | 135 What's Changed in Release 19.3R2-S6 | 138 What’s Changed in Release 19.3R2-S5 | 139 What’s Changed in Release 19.3R2 | 139 5 What’s Changed in Release 19.3R1 | 142 Known Limitations | 146 General Routing | 146 Infrastructure | 149 Interfaces and Chassis | 149 MPLS | 150 Platform and Infrastructure | 150 Routing Protocols | 151 Open Issues | 151 EVPN | 152 Forwarding and Sampling | 153 General Routing | 153 Infrastructure | 161 Interfaces and Chassis | 161 Layer 2 Ethernet Services | 162 MPLS | 162 Platform and Infrastructure | 163 Routing Protocols | 164 Services Applications | 166 Subscriber Access Management | 166 User Interface and Configuration | 166 VPNs | 166 Resolved Issues | 167 Resolved Issues: 19.3R3 | 167 Resolved Issues: 19.3R2 | 186 Resolved Issues: 19.3R1 | 195 Documentation Updates | 214 Migration, Upgrade, and Downgrade Instructions | 215 Basic Procedure for Upgrading to Release 19.3 | 216 Procedure to Upgrade to FreeBSD 11.x based Junos OS | 216 Procedure to Upgrade to FreeBSD 6.x based Junos OS | 219 Upgrade and Downgrade Support Policy for Junos OS Releases | 220 Upgrading a Router with Redundant Routing Engines | 221 Downgrading from Release 19.3 | 221 6 Junos OS Release Notes for NFX Series | 222 What’s New | 222 Release 19.3R3 New and Changed Features | 223 Release 19.3R2 New and Changed Features | 223 Release 19.3R1 New and Changed Features | 223 What's Changed | 224 What's Changed in Release 19.3R2-S6 | 224 Known Limitations | 225 Interfaces | 225 Platform and Infrastructure | 225 Virtual Network Functions (VNFs) | 226 Open Issues | 226 Interfaces | 226 High Availability (HA) | 227 Platform and Infrastructure | 227 Virtual Network Functions (VNFs) | 227 Resolved Issues | 228 Resolved Issues: 19.3R3 | 228 Resolved Issues: 19.3R2 | 229 Resolved Issues: 19.3R1 | 230 Documentation Updates | 232 Migration, Upgrade, and Downgrade Instructions | 232 Upgrade and Downgrade Support Policy for Junos OS Releases | 232 Basic Procedure for Upgrading to Release 19.3 | 233 Junos OS Release Notes for PTX Series Packet Transport Routers | 234 What's New | 235 What's New in Release 19.3R3 | 235 What's New in Release 19.3R2 | 235 What's New in Release 19.3R1 | 236 What's Changed | 243 What’s Changed in Release 19.3R3-S1 | 244 What's Changed in Release 19.3R3 | 244 Juniper Extension Toolkit (JET) | 245 What's Changed in Release 19.3R2-S6 | 245 7 What's Changed in Release 19.3R2 | 246 What's Changed in Release 19.3R1 | 246 Known Limitations | 248 General Routing | 248 Interfaces and Chassis | 249 Open Issues | 249 General Routing | 249 Routing Protocols | 250 Resolved Issues | 251 Resolved Issues: Release 19.3R3 | 251 Resolved Issues: Release 19.3R2 | 254 Resolved Issues: Release 19.3R1 | 255 Documentation Updates | 257 Migration, Upgrade, and Downgrade Instructions | 258 Basic Procedure for Upgrading to Release 19.3 | 258 Upgrade and Downgrade Support Policy for Junos OS Releases | 261 Upgrading a Router with Redundant Routing Engines | 262 Junos OS Release Notes for the QFX Series | 263 What's New | 263 What’s New in Release 19.3R3 | 264 What’s New in Release 19.3R2 | 264 What’s New in Release 19.3R1 | 264 What's Changed | 272 What’s Changed in Release 19.3R3-S1 | 273 What's Changed in Release 19.3R3 | 273 What's Changed in Release 19.3R2-S6 | 275 What's Changed in Release 19.3R2 | 276 What's Changed in Release 19.3R1 | 276 Known Limitations | 279 Class of Service (CoS) | 280 EVPN | 280 Platform and Infrastructure | 280 Infrastructure | 281 Layer 2 Features | 281 8 Routing Protocols | 282 Open Issues | 282 EVPN | 283 High Availability (HA) and Resiliency | 283 Infrastructure | 283 Interfaces and Chassis | 283 Junos Fusion Provider Edge | 284 Layer 2 Features | 284 Platform and Infrastructure | 284 Routing Protocols | 286 Virtual Chassis | 287 Resolved Issues | 287 Resolved Issues: Release 19.3R3 | 288 Resolved Issues: Release 19.3R2 | 296 Resolved Issues: Release 19.3R1 | 300 Documentation Updates | 307 Migration, Upgrade, and Downgrade Instructions | 308 Upgrading Software on QFX Series Switches | 308 Installing the Software on QFX10002-60C Switches | 311 Installing the Software on QFX10002 Switches | 311 Upgrading Software from Junos OS Release 15.1X53-D3X to Junos OS Release 15.1X53-D60, 15.1X53-D61.7, 15.1X53-D62, and 15.1X53-D63 on QFX10008 and QFX10016 Switches | 312 Installing the Software on QFX10008 and QFX10016 Switches | 314 Performing a Unified ISSU | 318 Preparing the Switch for Software Installation | 319 Upgrading the Software Using Unified ISSU | 319 Upgrade and Downgrade Support Policy for Junos OS Releases | 321 Junos OS Release Notes for SRX Series | 322 What’s New | 323 What’s New in Release 19.3R3 | 323 What’s New in Release 19.3R2 | 323 9 What’s New in Release 19.3R1 | 323 What's Changed | 331 What's Changed in Release 19.3R3 | 332 What's Changed in Release 19.3R2-S6 | 333 What's Changed in Release 19.3R2 | 334 What's Changed in Release 19.3R1 | 334 Known Limitations | 336 Authentication and Access Control | 337 J-Web | 337 Logical Systems and Tenant Systems | 338 Platform and Infrastructure | 338 VPNs | 338 Open Issues | 339 Flow-Based and Packet-Based Processing | 339 Intrusion Detection and Prevention (IDP) | 339 J-Web | 340 Routing Policy and Firewall Filters | 340 VPNs | 340 Resolved Issues | 341 Resolved Issues: Release 19.3R3 | 341 Resolved Issues: Release 19.3R2 | 347 Resolved Issues: Release 19.3R1 | 350 Documentation Updates | 358 Migration, Upgrade, and Downgrade Instructions | 358 Upgrade and Downgrade Support Policy for Junos OS Releases and Extended End-Of-Life Releases | 359 Upgrading Using ISSU | 360 Licensing | 360 Finding More Information | 361 Documentation Feedback | 361 Requesting Technical Support | 362 Self-Help Online Tools and Resources | 362 Opening a Case with JTAC | 363 Revision History | 363 10 Introduction Junos OS runs on the following Juniper Networks® hardware: ACX Series, EX Series, M Series, MX Series, NFX Series, PTX Series, QFabric systems, QFX Series, SRX Series, T Series, and Junos Fusion.