Operate and maintain
Documents under this category provide background concepts and procedures for configuring, operating, and maintaining SR Linux software.
- ACL and Traffic Steering Guide
  This document describes ACL and policy-based routing configuration for the Nokia Service Router Linux (SR Linux).
- Advanced Configuration Guide
  This document describes how to configure advanced solutions for the Nokia Service Router Linux (SR Linux). Advanced solutions are defined as more complex network-level configurations where additional guidance and more detailed procedures may be required.
- CLI Plug-in Guide
  This document describes how to create custom CLI plug-ins, and defines the classes and utility functions used to create them. It also defines how to install, modify, and remove a CLI plug-in.
- Configuration Basics Guide
  This document describes basic configuration for the Nokia Service Router Linux (SR Linux). Examples of commonly used commands are provided.
- gRIBI Guide
  This guide describes configuration details for the gRPC Routing Information Base Interface (gRIBI) feature set used with the Nokia Service Router Linux (SR Linux).
- Interfaces Guide
  This document describes interface configuration for the Nokia Service Router Linux (SR Linux), including subinterfaces, IRB interfaces, LAGs, DHCP relay, and IPv6 router advertisements.
- MPLS Guide
  This guide describes the services and provides configuration examples for the Multiprotocol Label Switching (MPLS) protocol used with the Nokia Service Router Linux (SR Linux).
- Multicast Guide
  This guide provides an overview of multicast routing concepts and provides configuration examples for Internet Group Management Protocol (IGMP), Multicast Listener Discovery (MLD), and Protocol Independent Multicast (PIM).
- Network Synchronization Guide
  This guide describes the network synchronization features for the Nokia Service Router Linux (SR Linux).
- P4Runtime Guide
  This document describes SR Linux support for P4Runtime and includes procedures for configuring SR Linux to operate with P4Runtime clients.
- Quality of Service Guide for 7220 IXR and 7250 IXR
  This document describes configuration details for the Quality of Service (QoS) feature set used with the Nokia Service Router Linux (SR Linux) on IXR-series platforms.
- Quality of Service Guide for 7730 SXR
  This document describes configuration details for the Quality of Service (QoS) feature set used with the Nokia Service Router Linux (SR Linux) on SXR-series platforms.
- Routing Protocols Guide
  This document describes routing protocol configuration for the Nokia Service Router Linux (SR Linux), including OSPF, IS-IS, and BGP.
- Segment Routing Guide
  This document describes configuration details for the Segment Routing feature set used with the Nokia Service Router Linux (SR Linux).
- System Management Guide
  This document describes the interfaces used with the Nokia Service Router Linux (SR Linux).
- VPN Services Guide
  This document describes basic configuration for Layer 2 and Layer 3 Virtual Private Network service functionality on the Nokia Service Router Linux (SR Linux). It presents examples to configure and implement various protocols and services.

What's new

This section lists the changes that were made in this release.

Table 1. What's new in Release 26.3.1
Topic	Location
Mixed chassis mode	Chassis types
Supports 7250 IXR Gen 2c+ and 7250 IXR (including mixed)	Non-Stop Routing
SSH port forwarding	Configuring SSH port forwarding
NTP TLS support	NTP TLS support
Enhanced password complexity rules	Password security for local users
gRPC tunnel support	gRPC tunnel
Updated platform support for VRRP	Supported platforms
DNS instances bound to specific network-instances	DNS instances
New OpenConfig-based model for configuring next-hop-groups	Static routes
GUE tunnel encapsulation using static routes	New model for configuring static routes
Route leaking based on BGP attributes	Matching BGP attributes in a route-leaking-export policy

March 19, 2026