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

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65 Troubleshooting 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 66 33 Troubleshooting • Most common issues Adjacency is not coming up Information is in database not in routing table SPF running constantly 316 0934_04F9_c4 67 © 1999, Cisco Systems, Inc. ) • Useful OSPF commands Show ip ospf neighbor Sh ip ospf database Sh ip ospf Debug ip ospf adj 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc.

Printed in USA. 1 Serial2 73 © 1999, Cisco Systems, Inc. 2 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. 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.

Minimum LSA arrival 1 secs Number of external LSA 0. Checksum Sum 0x0 Number of DCbitless external LSA 0 Number of DoNotAge external LSA 0 Number of areas in this router is 2. 1 normal 1 stub 0 nssa External flood list length 0 Area BACKBONE(0) (Inactive) Number of interfaces in this area is 2 Area has no authentication SPF algorithm executed 8 times Area ranges are Number of LSA 1. Checksum Sum 0xA180 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0 316 0934_04F9_c4 © 1999, Cisco Systems, Inc.

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Advanced OSPF, NLSP, IS IS and Troubleshooting 316


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