Cisco - IXC Architecture 1503

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Routers—switches) 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 64 32 Policies and Network Services • Policies are created by specifying how network layer (layer 3) services are utilized to control the network’s resources • External policy implementation should be pushed to edges of network, as much as possible 1503 0925_04F9_c1 65 © 1999, Cisco Systems, Inc. Policy Architecture— Edge Functions • Customer access aggregation • Traffic filtering • Route filtering • Admission control • Bandwidth allocation • Shaping • QoS/CoS marking • Traffic classification and prioritization • Route filtering • Access control • Accounting 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc.

Delay? jitter (delay variation)? • Do not allow new services to oversubscribe the network capacity more than it may have already been over-subscribed prior to deployment of said services 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 98 49 Deployment of New Services • Is more of a business decision • The technical aspect is to ensure continued network performance— scalability and stability • Remember that services which might cross AS boundaries are statistically less probable of being successful 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc.

Printed in USA. scr 82 41 Source: Bell Atlantic 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc. 83 Internet Exchange Points 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 84 42 ISP/IXC Interconnection Points NAP ISP Z CIX ISP D ISP C ISP B MAE West ISP A NAP MAE West Source: WorldCom MAE Services 1503 0925_04F9_c1 85 © 1999, Cisco Systems, Inc. Exchange Points Generally… • Do not include peering agreements with any of the ISP’s who are connected Peering • Do not include transit with any of the ISP’s who are connected Transit • Do not guarantee that there will be specific major ISP’s present • Do not provide IP addresses or AS (Autonomous System) numbers 1503 0925_04F9_c1 © 1999, Cisco Systems, Inc.

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