MPLS VPN Technology

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Business-Needs Based VPN Classification Virtual Private Networks Virtual Circuit (VC) #1 PE device CPE router Customer site Provider core device Other CPE router customer Customer Premises Provider edge device PE device routers router (CPE) (Frame Relay switch) Large customer site Virtual Circuit (VC) #2 Service Provider Network • Virtual Private Networks replace dedicated point-topoint links with emulated point-to-point links sharing common infrastructure • Customers use VPNs primarily to reduce their operational costs © 2002, Cisco Systems, Inc. www.cisco.com MPLS v2.1-6 Virtual Private Networks (VPNs) were introduced very early in the history of data communications with technologies like X.25 and Frame Relay, which use virtual circuits to establish the end-to-end connection over a shared service provider infrastructure. These technologies, although sometimes considered legacy and obsolete, still share the basic business assumptions with the modern VPN approaches: ■ The dedicated links are replaced with common infrastructure that emulates point-to-point links for the customer, resulting in statistical sharing of Service Provider infrastructure ■ Statistical sharing of infrastructure enables the service provider to offer the connectivity for lower price, resulting in lower operational costs for the end customers. The statistical sharing is illustrated in the graphic, where you can see the CPE router on the left has one physical connection to the service provider with two virtual circuits provisioned. Virtual Circuit 1 (VC # 1) provides connectivity to the top CPE router on the right. Virtual Circuit 2 (VC #2) provides the connectivity to the bottom CPE router on the right. 6 Implementing Cisco MPLS (MPLS) v2.1 Copyright © 2002, Cisco Systems, Inc.
Practice Q1) Why are customers interested in Virtual Private Networks? A) VPNs use point-to-multipoint links which enables more connections for customers. B) VPNs reduce customers' connectivity costs. C) VPNs are easiest to configure. Copyright © 2002, Cisco Systems, Inc. MPLS VPN Technology 7
Page 1 and 2: MPLS VPN Technology Overview Outlin
Page 3 and 4: Overview Importance Objectives Intr
Page 5: Virtual Private Network Concept Pra
Page 9 and 10: VPN Terminology (Cont.) Customer si
Page 11 and 12: Summary Next Steps After completing
Page 13 and 14: Overview Importance Objectives Over
Page 15 and 16: Overlay VPN Implementation VPN Impl
Page 17 and 18: Practice Layer-3 Routing Routing in
Page 19 and 20: Overlay Overlay VPN Layer-2 Impleme
Page 21 and 22: Layer-2 Transport Protocol (L2TP) O
Page 23 and 24: Peer-to-Peer VPN Concept Customer S
Page 25 and 26: Peer-to-Peer VPN Implemented with I
Page 27 and 28: Practice Q1) Where is Border Gatewa
Page 29 and 30: Drawbacks of Various VPN Implementa
Page 31 and 32: Practice Virtual Private Networks V
Page 33 and 34: Lesson Review Instructions Answer t
Page 35 and 36: Overview Importance Objectives Majo
Page 37 and 38: Hub-and-Spoke Overlay VPN Topology
Page 39 and 40: Overlay Overlay VPN Hub-and-Spoke T
Page 41 and 42: Partial-Mesh or Full-Mesh Overlay V
Page 43 and 44: Practice VPN Business Categorizatio
Page 45 and 46: Extranet VPN—Peer-to-Peer VPN—P
Page 47 and 48: Practice Q1) What is the difference
Page 49 and 50: Central Services Extranet—Hybrid
Page 51 and 52: Summary Next Steps After completing
Page 53 and 54: Overview Importance Objectives MPLS
Page 55 and 56: Peer-to-Peer VPN Review MPLS VPN Ar
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Overall MPLS VPN Architecture Custo
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Customer A Customer B Customer C Ro
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Customer A Customer B Customer C Ro
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Practice Q1) How are customer route
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Route Distinguisher Usage Usage in
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Route Distinguisher Usage Usage in
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Practice Q1) What is a route distin
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Sample Sample VoIP Service Connecti
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What Are Are Route Route Targets?
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10.1.10.0/24 A CS 11.1.2.0/24 10.1.
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Impact of Complex VPN Topologies on
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Practice Q1) What is the impact of
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Summary Next Steps After completing
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Overview Importance Objectives MPLS
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MPLS VPN Routing Model MPLS VPN VPN
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MPLS VPN VPN Routing Routing Overal
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CE-router MPLS VPN VPN Routing Rout
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Practice Routing Tables on on PE-Ro
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MPLS MPLS VPN VPN End-to-End Routin
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All other BGP attributes are availa
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MP-BGP Update Extended Communities
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Practice MPLS MPLS VPN VPN End-to-E
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Practice Q1) Which BGP attributes c
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Lesson Review Instructions Answer t
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Overview Importance Objectives MPLS
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MPLS VPN Forwarding VPN Packet Pack
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VPN Packet Forwarding Across MPLS V
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Practice Q1) How are VPN packets pr
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VPN Label Label Propagation Propaga
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Practice VPN Label Label Propagatio
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Practice made automatically by IOS
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Practice CE-router VPN Packet Packe
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Objectives MPLS VPN Spanning more t
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Basic Requirements Requirements Whe
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Routing between ASes CE-router MPLS
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PE1 now can use the label V1 to rem
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IGP Inside Inside Confederations
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Summary After completing this lesso
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MPLS VPN Technology

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