About this content

Updated: September 11, 2026

Provides configuration guidance for deploying and managing L3VPN services on Cisco 8000 Series Routers running IOS XR. It covers MPLS L3VPN fundamentals, inter-AS options, carrier supporting carrier scenarios, EVPN multihoming, IPv6 VPN provider edge transport, and related YANG data models.

Whats changed in this book

Specific changes or updates tied to individual releases are clearly called out within the relevant sections. For a list of features introduced in a specific release, refer to the Release Notes.

The table lists the release numbers for which this document has been updated since its initial publication.

Table 1. Changes to this document
Date	Summary
September 2026	Republished for Release 26.3.1.
February 2026	Republished for Release 26.1.1.
December 2025	Republished for Release 25.4.1.
October 2025	First published for Release 25.3.1.

YANG Data Models for L3VPN Features

Lists the supported YANG data models and their corresponding L3VPN features on this platform.

MPLS L3VPN Fundamentals and Core Deployment

Introduces MPLS L3VPN fundamentals, core network deployment, and advanced VPN service options, outlining MPLS Layer 3 VPN concepts, topology operations, configuration procedures, verification steps, VRF-lite integration, and implementation using RSVP-TE and Segment Routing.

Inter-AS L3VPN Fundamentals and Route Reflector Exchange

Introduces Inter-AS L3VPN architecture, covering VPN connectivity across autonomous systems, ASBR and route reflector roles, BGP route and label exchange, and configuration procedures for scalable MPLS VPN services in multi-provider environments.

Inter-AS Option B for L3VPN

Explains Inter-AS Option B for L3VPN, outlining core functions, topology mechanisms, and configuration procedures to enable seamless Layer 3 VPN integration across autonomous systems.

Carrier Supporting Carrier for L3VPN

Outlines Carrier Supporting Carrier architecture for L3VPN, detailing core concepts, packet flow processes, key benefits, and complete configuration procedures for implementing carrier transport and connectivity in multi-provider MPLS environments.

Layer-3 Route Synchronization for EVPN Multihoming

Outlines Layer-3 route synchronization concepts, operational requirements, benefits, and configuration procedures for EVPN multihoming, enabling resilient and efficient routing in multi-home network environments.

IPv6 VPN Provider Edge Transport over MPLS

Outlines IPv6 VPN provider edge transport mechanisms over MPLS, including deployment considerations, configuration procedures, protocol integration, and verification steps for efficient and secure networking across MPLS infrastructures.

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