10. VPN Requirements IP/IP IPSec GRE L2TP MPLS Multiplexing y y y y Signaling y y y y Security y y Multi-protocol traffic y y y Frame Sequencing y y y Maintenance Large MTUs Minimization of Tunnel overhead Flow/Congestion Control y QoS/Traffic Management y
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16. Virtual Leased Lines CPE ISP Edge Router IP Backbone CPE ATM VCC ATM VCC IP Tunnel 10.0.0.5 10.0.0.6 10.0.0.4/30 ISP Edge Router Provides a point to point link between customer’s CPE devices ISP edge binds ATM VCC to a tunnel in IP backbone e.g. AAL5 payload is encapsulated in an IPSEC tunnel in backbone
17. Virtual Private Dial Networks CPE NAS IP Backbone Gateway Dial Up Connection 10.0.0.0 / 16 10.0.0.6 L2TP Tunnel Corporate Network L2TP – Layer 2 Tunneling Protocol LAC - L2TP Access Concentrator LNS – L2TP Network Server PPP frames are tunneled across IP backbone using L2TP L2 connection terminating at LAC avoids long distance dialup connection PPP session terminates at LNS LAC LNS
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19. Virtual Private Routed Networks CPE 1 PE Router IP Backbone PE Router CPE 1 10.1.1.0 / 30 PE Router CPE 1 Stub Link Stub Link IP Tunnel IP Tunnel IP Tunnel 10.3.3.0 / 30 Stub Link CPE 2 CPE 2 Stub Link Stub Link 10.2.2.0 / 30 10.5.5.0 / 30 10.6.6.0 / 30 P P P PE – Provider Edge CPE – Customer Premises Equipment P – Provider/Interior 10.1.1.1 10.5.5.1 10.0.0.1 157.0.0.1 Provider Backbone Outer IP Header Destination Address 157.0.0.1 Inner IP Header Destination Address 10.5.5.1 Customer data Encapsulation in IP/IP
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30. VR Model CPE 1 PE Router CPE 1 CPE 1 PE Router PE Router CPE 3 CPE 2 CPE 2 CPE 3 CPE 3 Backdoor Link S T U B L I N K S VPRN 1 VPRN 2 VPRN 3 VRF VRF VRF – VPN Routing and Forwarding Table VR Instance for CE 1 VR Instance for CE 2 VR Instance for CE 3
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