8. VPN: Overlay on shared infrastructure SERVICE PROVIDER NETWORK: SHARED INFRASTRUCTURE Customer 1 Site 1 Customer 1 Site 2 Customer 1 Site 3 Customer 2 Site 1 Customer 2 Site 2 Customer 2 Site 3 Customer 3 Site 1 Customer 3 Site 2 Customer 3 Site 3
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25. L2VPN Reference Model SERVICE PROVIDER NETWORK PE PE PE PE PE PE P SITE 1 SITE 2 SITE 3 CE 1 CE 2 CE 3 Pseudowire1-3 Attachment circuits Attachment circuits Attachment circuits Pseudowire1-2 Pseudowire2-3
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27. Configuration: Martini Approach interface sonet 3/1 encap frame-relay frame-relay interface dlci 43 mpls l2transport route 16.22.22.222 100 43 mtu 1500 ... DLCI VC ID PE2 IP address DLCI 43 SERVICE PROVIDER NETWORK CE 1 PE 1 16.22.22.221 PE 2 16.22.22.222 CE 2 DLCI 44 interface sonet 5/2 encap frame-relay frame-relay interface dlci 44 mpls l2transport route 16.22.22.221 100 44 mtu 1500 ... PE1 IP address VC ID DLCI
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35. Encapsulation Example PE 2 pseudowire DA SA 8847h Tunnel Label VC Label Control Word FR PAYLOAD RES F B D C RES LENGTH SEQUENCE NUMBER Martini Encapsulation FLAG FR HEADER FR PAYLOAD FCS DLCI C/R EA DLCI F B D EA PE 1 CE 1 DLCI