Download Cisco - Large Meshed IP Backbone Architecture - Session 1501 PDF

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Scr 76 38 IBGP Core Architecture IGP 5 IGP 5 IGP 6 IGP 6 AS 64530 IGP 7 IGP 7 IGP 8 1501 1120_06F9_c2 IGP 8 77 © 1999, Cisco Systems, Inc. Scaling iBGP mesh A AS 100 B C • Need to avoid routing information loop • Solution should not change the current behaviour • Two solutions: Route reflectors—simpler to deploy and run Confederation—difficult 1501 1120_06F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 78 39 Route Reflector: Principle • Router Reflector allows for a BGP hub (star) configuration Reflector A AS 100 B 1501 1120_06F9_c2 C © 1999, Cisco Systems, Inc.

D 68 34 What Is an EGP? • Exterior Gateway Protocol • Used to convey routing information between autonomous systems • De-coupled from the IGP • Current EGP is border gateway protocol See Session #309 “Deploying BGP” 1501 1120_06F9_c2 © 1999, Cisco Systems, Inc. 69 Why Do We Need an EGP? • Scaling to large network Hierarchy Limit scope of failure • Policy Control reachability to prefixes Merge separate organizations Connect multiple IGPs 1501 1120_06F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc.

All rights reserved. Printed in USA. scr 76 38 IBGP Core Architecture IGP 5 IGP 5 IGP 6 IGP 6 AS 64530 IGP 7 IGP 7 IGP 8 1501 1120_06F9_c2 IGP 8 77 © 1999, Cisco Systems, Inc. Scaling iBGP mesh A AS 100 B C • Need to avoid routing information loop • Solution should not change the current behaviour • Two solutions: Route reflectors—simpler to deploy and run Confederation—difficult 1501 1120_06F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.

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