Prerequisites For Implementing Mpls L3Vpn; Configure The Core Network; Assess The Needs Of Mpls Vpn Customers - Cisco NCS 540 Series Configuration Manual

MPLS L3VPN Overview

Prerequisites for Implementing MPLS L3VPN

These are the prerequisites to configure MPLS L3VPN:
• You must be in a user group associated with a task group that includes the proper task IDs for these
• If you suspect user group assignment is preventing you from using a command, contact your AAA
• To configure MPLS Layer 3 VPNs, routers must support MPLS forwarding and Forwarding Information

Configure the Core Network

Consider a network topology where MPLS L3VPN services are transported over MPLS LDP core.
Figure 4: L3VPN over MPLS LDP
Configuring the core network involves these main tasks:
•
•
•
•
•

Assess the Needs of MPLS VPN Customers

Before configuring an MPLS VPN, the core network topology must be identified so that it can best serve
MPLS VPN customers. The tasks listed below helps to identify the core network topology.
• Identify the size of the network:
commands:
• • BGP
• IGP
• MPLS
• MPLS Layer 3 VPN
administrator for assistance.
Base (FIB).
Assess the Needs of MPLS VPN Customers, on page 9
Configure Routing Protocols in the Core, on page 10
Configure MPLS in the Core, on page 11
Determine if FIB is Enabled in the Core, on page 12
Configure Multiprotocol BGP on the PE Routers and Route Reflectors, on page 12
Identify the following to determine the number of routers and ports required:
L3VPN Configuration Guide for Cisco NCS 540 Series Routers, IOS XR Release 6.3.x
Prerequisites for Implementing MPLS L3VPN
9