CHAPTER 26
Configuring Layer 3 VPNs
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Layer 3 VPN Introduction on page 813
•
Understanding Layer 3 VPN Attributes on page 814
•
Understanding VPN-IPv4 Addresses and Route Distinguishers on page 815
•
Understanding Virtual Routing and Forwarding Tables on page 818
•
Understanding IPv4 Route Distribution in a Layer 3 VPN on page 822
•
Understanding Layer 3 VPN Forwarding Through the Core on page 826
•
Understanding Routing Instances for Layer 3 VPNs on page 827
•
Configuring a VPN Tunnel for VRF Table Lookup on page 828
•
Introduction to Configuring Layer 3 VPNs on page 828
•
Configuring Routing Between PE and CE Routers in Layer 3 VPNs on page 830
•
Limiting the Number of Paths and Prefixes Accepted from CE Routers in Layer 3
VPNs on page 841
•
Understanding IPv6 Layer 3 VPNs on page 842
•
Layer 3 VPNs for IPv4 and IPv6 Overview on page 842
•
Configuring Layer 3 VPNs to Carry IPv6 Traffic on page 844
•
Configuring EBGP Multihop Sessions Between PE and CE Routers in Layer 3
VPNs on page 848
•
Configuring Layer 3 VPNs to Carry IBGP Traffic on page 849
•
Configuring a Label Allocation and Substitution Policy for VPNs on page 850
•
Configuring Protocol-Independent Load Balancing in Layer 3 VPNs on page 852
•
Configuring the Algorithm That Determines the Active Route to Evaluate AS Numbers
in AS Paths for VPN Routes on page 855
•
Accepting Route Updates with Unique Inner VPN Labels in Layer 3 VPNs on page 855
Layer 3 VPN Introduction
In Junos OS, Layer 3 VPNs are based on RFC 4364. RFC 4364 defines a mechanism by
which service providers can use their IP backbones to provide VPN services to their
customers. A Layer 3 VPN is a set of sites that share common routing information and
whose connectivity is controlled by a collection of policies. The sites that make up a
Layer 3 VPN are connected over a provider’s existing public Internet backbone.
813Copyright © 2017, Juniper Networks, Inc.
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