MPLS VPN Technology

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VPN VPN Topology Topology Categorization Categorization Overlay VPNs are categorized based on the topology of the virtual circuits: • (Redundant) Hub-and-spoke topology • Partial-mesh topology • Full-mesh topology • Multi-level topology—combines several levels of overlay VPN topologies © 2002, Cisco Systems, Inc. www.cisco.com MPLS v2.1-32 The oldest VPN categorization was based on the topology of point-to-point links in an overlay VPN implementation: ■ Full-mesh topology provides a dedicated virtual circuit between any two CErouters in the network ■ Partial-mesh topology reduces the number of virtual circuits, usually to the minimum number that still provides optimum transport between major sites ■ Hub-and-spoke topology is the ultimate reduction of partial-mesh – many sites (spokes) are only connected with the central site(s) (hubs) with no direct connectivity between the spokes. To prevent single points of failure, the huband-spoke topology is sometimes extended to redundant hub-and-spoke topology. Large networks usually deploy a layered combination of these technologies, for example: ■ Partial mesh in the network core ■ Redundant hub-and-spoke for larger branch offices (spokes) connected to distribution routers (hubs) ■ Simple hub-and-spoke for non-critical remote locations (for example, home offices). 38 Implementing Cisco MPLS (MPLS) v2.1 Copyright © 2002, Cisco Systems, Inc.
Overlay Overlay VPN Hub-and-Spoke Topology Central site (HUB) Central site router Service Provider Network Remote site (spoke) Remote site (spoke) Remote site (spoke) Remote site (spoke) © 2002, Cisco Systems, Inc. www.cisco.com MPLS v2.1-33 The hub-and-spoke topology is the simplest overlay VPN topology – all remote sites are linked with a single virtual circuit to a central CE-router. The routing is also extremely simple – static routing or distance-vector protocol like RIP are more than adequate. If you are using dynamic routing protocol like RIP, splithorizon must be disabled at the hub router, or you must use point-to-point subinterfaces at the hub router to overcome the split-horizon problem. Copyright © 2002, Cisco Systems, Inc. MPLS VPN Technology 39
Page 1 and 2: MPLS VPN Technology Overview Outlin
Page 3 and 4: Overview Importance Objectives Intr
Page 5 and 6: Virtual Private Network Concept Pra
Page 7 and 8: Practice Q1) Why are customers inte
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: Hub-and-Spoke Overlay VPN Topology
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 53 and 54: Overview Importance Objectives MPLS
Page 55 and 56: Peer-to-Peer VPN Review MPLS VPN Ar
Page 57 and 58: Overall MPLS VPN Architecture Custo
Page 59 and 60: Customer A Customer B Customer C Ro
Page 61 and 62: Customer A Customer B Customer C Ro
Page 63 and 64: Practice Q1) How are customer route
Page 65 and 66: Route Distinguisher Usage Usage in
Page 67 and 68: Route Distinguisher Usage Usage in
Page 69 and 70: Practice Q1) What is a route distin
Page 71 and 72: Sample Sample VoIP Service Connecti
Page 73 and 74: What Are Are Route Route Targets?
Page 75 and 76: 10.1.10.0/24 A CS 11.1.2.0/24 10.1.
Page 77 and 78: Impact of Complex VPN Topologies on
Page 79 and 80: Practice Q1) What is the impact of
Page 83 and 84: Overview Importance Objectives MPLS
Page 85 and 86: MPLS VPN Routing Model MPLS VPN VPN
Page 87 and 88: 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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