Cisco NCS 540 Series User Manual

• How many customers to be supported?
• How many VPNs are required for each customer?
• How many virtual routing and forwarding (VRF) instances are there for each VPN?
• Determine the routing protocols required in the core.
• Determine if BGP load sharing and redundant paths in the MPLS VPN core are required.
Configure Routing Protocols in the Core
You can use RIP, OSPF or IS-IS as the routing protocol in the core.
Figure 5: OSPF as Routing Protocol in the Core
Configuration Example
This example lists the steps to configure OSPF as the routing protocol in the core.
Router-PE1#configure
Router-PE1(config)#router ospf dc-core
Router-PE1(config-ospf)#address-family ipv4 unicast
Router-PE1(config-ospf)#area 1
Router-PE1(config-ospf-ar)#interface HundredGigE0/0/1/0
Router-PE1(config-ospf-vrf-ar-if)#commit
Running Configuration
router ospf dc-core
router-id 13.13.13.1
address-family ipv4 unicast
area 1
interface HundredGigE0/0/1/0
!
!
!
Verification
• Verify the OSPF neighbor and ensure that the State is displayed as 'FULL'.
Router-PE1# show ospf neighbor
Neighbors for OSPF dc-core
Neighbor ID Pri State Dead Time Address Interface
16.16.16.1 1 FULL/DR 00:00:34 191.22.1.2 HundredGigE0/0/1/0
Neighbor is up for 1d18h
Total neighbor count: 1
L3VPN Configuration Guide for Cisco NCS 540 Series Routers, IOS XR Release 6.3.x
10
MPLS L3VPN Overview
Configure Routing Protocols in the Core

Cisco NCS 540 Series Specifications

General

Series	NCS 540
Category	Network Router
Operating System	Cisco IOS XR
Form Factor	1RU, 2RU
Forwarding Capacity	Up to 800 Gbps
Redundancy	Power supply, fan
Power Supply	AC or DC options
Management	CLI, SNMP, NETCONF
Storage Temperature	-40 to 70°C (-40 to 158°F)
Humidity	5% to 95% non-condensing

Summary

MPLS L3VPN Overview

How MPLS L3VPN Works

Explains the fundamental operational principles of MPLS L3VPN.

Major Components of MPLS L3VPN

Details the key elements that constitute an MPLS L3VPN network.

How to Implement MPLS Layer 3 VPNs

Configure the Core Network

Guides on setting up the MPLS core network for L3VPN services.

Configure Core Routing Protocols

Instructions for configuring routing protocols within the MPLS core.

Configure MPLS in the Core

Steps to enable MPLS on core network routers using LDP.

Configure MP-BGP on PE Routers and Route Reflectors

Steps to configure MP-BGP for VPN reachability.

Connect MPLS VPN Customers

Procedures for connecting customer edge devices to the MPLS VPN.

Define VRFs on PE Routers

How to define VRF instances on PE routers for customer VPNs.

Configure VRF Interfaces on PE Routers

Steps to associate VRF instances with interfaces on PE routers.

Configure PE-CE Routing Protocols

Setting up routing protocols between PE and CE routers.

Verify MPLS L3VPN Configuration

Ensures the successful configuration of MPLS L3VPN.

Verify L3VPN Traffic Flow

Verify Underlay Transport

Verify Overlay (L3VPN)

VRF-lite

Configure VRF-lite

Steps to configure VRF-lite for supporting multiple VPNs.

MPLS L3VPN with Segment Routing

Configure MPLS L3VPN over Segment Routing

Guides on configuring MPLS L3VPN services with segment routing.

Major MPLS L3VPN Components Details

Virtual Routing and Forwarding Tables

Implementing IPv6 VPN Provider Edge Transport over MPLS

Overview of 6PE/VPE

IPv6 on PE and CE Routers

OSPFv3 6VPE

Configuring 6PE/VPE

Provides examples for configuring 6PE on PE routers.

Configure OSPFv3 for PE-CE Routing