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Cisco NCS 540 Series User Manual
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L3VPN
Configuration
Guide
for
Cisco
NCS
540
Series
Routers,
IOS
XR
Release
6.3.x
First
Published:
2018-03-30
Americas
Headquarters
Cisco
Systems,
Inc.
170
W
est
T
asman
Drive
San
Jose,
CA
95134-1706
USA
http://www
.cisco.com
T
el:
408
526-4000
800
553-NETS
(6387)
Fax:
408
527-0883
2
Table of Contents
Default Chapter
5
Table of Contents
5
Changes to this Document
9
Obtaining Documentation and Submitting a Service Request
9
How MPLS L3VPN Works
12
Major Components of MPLS L3VPN
12
Restrictions for MPLS L3VPN
13
Inter-AS Support for L3VPN
13
Inter-AS Support: Overview
13
Inter-AS and Asbrs
14
Confederations
15
MPLS VPN Inter-AS BGP Label Distribution
16
Exchanging Ipv4 Routes with MPLS Labels
17
How to Implement MPLS Layer 3 Vpns
18
Prerequisites for Implementing MPLS L3VPN
19
Configure the Core Network
19
Assess the Needs of MPLS VPN Customers
19
Configure Routing Protocols in the Core
20
Configure MPLS in the Core
21
Configure Multiprotocol BGP on the PE Routers and Route Reflectors
22
Determine if FIB Is Enabled in the Core
22
Connect MPLS VPN Customers
25
Define Vrfs on PE Routers to Enable Customer Connectivity
26
Configure VRF Interfaces on PE Routers for each VPN Customer
27
Configure Routing Protocol between the PE and CE Routers
28
Verify MPLS L3VPN Configuration
35
Verify the L3VPN Traffic Flow
35
Verify the Underlay (Transport)
36
Verify the Overlay (L3VPN)
38
Asbrs Exchanging Ipv4 Routes and MPLS Labels
40
Concept
40
Configuring Asbrs to Exchange Ipv4 Routes and MPLS Labels
40
Configuring the Route Reflectors to Exchange VPN-Ipv4 Routes
42
Configure the Route Reflectors to Reflect Remote Routes in Its as
44
Asbrs Exchanging VPN-Ipv4 Addresses
45
Configuring the Asbrs to Exchange VPN-Ipv4 Addresses for IP Tunnels
45
Configuring a Static Route to an ASBR Peer
48
Confederation
49
Configuring MPLS Forwarding for ASBR Confederations
51
Configuring a Static Route to an ASBR Confederation Peer
52
VRF-Lite
53
Configure VRF-Lite
53
MPLS L3VPN Services Using Segment Routing
57
Configure MPLS L3VPN over Segment Routing
57
Configure Segment Routing in MPLS Core
58
Verify MPLS L3VPN Configuration over Segment Routing
61
Implementing MPLS L3Vpns - References
62
MPLS L3VPN Benefits
62
Major Components of MPLS L3VPN-Details
62
Virtual Routing and Forwarding Tables
62
BGP Distribution of VPN Routing Information
63
MPLS Forwarding
63
VPN Routing Information: Distribution
63
Automatic Route Distinguisher Assignment
64
Chapter 1 Chapter 2
65
Implementing Ipv6 VPN Provider Edge Transport over MPLS
65
Overview of 6PE/VPE
65
Benefits of 6PE/VPE
66
Deploying Ipv6 over MPLS Backbones
66
Ipv6 on the Provider Edge and Customer Edge Routers
66
Ospfv3 6VPE
67
Configuring 6PE/VPE
68
Configuring Ospfv3 as the Routing Protocol between the PE and CE Routers
70
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Cisco NCS 540 Series Specifications
General
Brand
Cisco
Model
NCS 540 Series
Category
Network Router
Language
English
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