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Additional info for Advanced OSPF, NLSP, IS IS and Troubleshooting 316

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All rights reserved. Printed in USA. 60 seq 0x7DB • Probable causes Slower link between the two routers Slower router on the other end of the link • Solution Increase the retransmission timer 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. ) • Information in database not in routing table • Possible causes Route to forward address not OSPF internal Distribute list configured Ospf enabled on secondary address but not on primary 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc.

Scr 60 30 Migration Strategy • Divide the network into multiple regions • Pick a router from each region to be BGP peer • iBGP between BGP peers 316 0934_04F9_c4 61 © 1999, Cisco Systems, Inc. Migration Strategy • Redistribute local regional routes into BGP • Originate default from each iBGP peer into local IGP • If redundancy is required—each region could have multiple BGP peers 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.

63 EBGP Core Architecture 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 64 32 Benefits of New Design • Faster convergence within individual IGP’s • Policy can be applied • Regions can have local administration • Isolation of IGP’s—greater stability 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. 65 Troubleshooting 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.

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