Cisco - Deploying IP Switching Protocols 312

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Printed in USA. scr 70 35 BGP/TAG VPN • VPN identification available only in the edge • Per-hop forwarding not possible • Use tag/MPLS to forward packet using the constrained route information 312 0986_05F9_c2 71 © 1999, Cisco Systems, Inc. BGP/TAG VPN Enterprise A Enterprise B Intranet VPN 10 Extranet VPN 20 Enterprise A Enterprise B Enterprise C 312 0986_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 72 36 Summary—Integrated Switching Services Layer 3 Backbones— Cisco Express Forwarding and NetFlow NetFlow Switching • Deployed at backbone periphery for network services: • Traffic accounting • QoS policy • Security 312 0986_05F9_c2 Cisco Express Forwarding • Deployed at network core for: • Forwarding performance • Scalability • Quality of Service 73 © 1999, Cisco Systems, Inc.

Traffic Engineering R9 R8 R3 R4 R2 Pop 32 R1 49 17 R6 R5 R7 22 Setup: Path (R1->R2->R6->R7->R4->R9) Reply: Resv communicates Tags and reserves bandwidth on each link 312 0986_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. 4/16 VPN A/Site 1 312 0986_05F9_c2 VPN B/Site 3 65 © 1999, Cisco Systems, Inc. BGP/TAG VPN • Constraint routing knowledge • Forwarding based on constraint knowledge • Address uniqueness • Tunneling 312 0986_05F9_c2 © 1999, Cisco Systems, Inc.

BGP/TAG VPN • Constraint routing knowledge • Forwarding based on constraint knowledge • Address uniqueness • Tunneling 312 0986_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 66 33 BGP/TAG VPN • Constrained distribution of routing information provides control over connectivity among sites • BGP is used to carry the routing information within the backbone • BGP, RIP or static route used between site and the backbone 312 0986_05F9_c2 67 © 1999, Cisco Systems, Inc.

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