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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.
All rights reserved. Printed in USA. scr 62 31 Traffic Engineering • Maintain established routes for traffic trunks • Re-route in case of failure • Traffic assigned to trunk using IGP • Use tag learned during trunk setup to tag-switch the packets 312 0986_05F9_c2 63 © 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.
Printed in USA. scr 68 34 BGP/TAG VPN • Along with constrained route advertisement, we need multiple forwarding table for VPN segregation • One forwarding table per VPN • Each customer port associated with a particular forwarding table 312 0986_05F9_c2 69 © 1999, Cisco Systems, Inc. BGP/TAG VPN • Address uniqueness within backbone achieved by creating new address family (RFC 2283) • VPN-IP address = Route distinguished + IPv4 address • New address relevant only within the backbone 312 0986_05F9_c2 © 1999, Cisco Systems, Inc.