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Additional resources for Advanced OSPF, NLSP, IS IS and Troubleshooting 316
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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. 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.
All rights reserved. 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.
All rights reserved. Printed in USA. 0 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. ) • IS-IS database Large variance in seq numbers— possible instabilities Hold time consistently large— possible instabilities, look at spf-log OL bit set—overload bit 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. ) • ISIS spf-log R1#sh isis spf-log Level 1 SPF log When Duration Nodes Count Triggers 01:41:31 4 3 1 PERIODIC 01:26:30 4 3 1 PERIODIC 01:11:30 4 3 1 PERIODIC 00:56:29 4 3 1 PERIODIC 00:11:27 4 3 1 PERIODIC Level 2 SPF log When Duration Nodes Count Triggers 01:58:39 8 3 1 PERIODIC 01:43:38 8 3 1 PERIODIC 01:28:38 8 3 1 PERIODIC 00:28:35 8 3 1 PERIODIC 00:13:34 4 3 1 PERIODIC 316 0934_04F9_c4 85 © 1999, Cisco Systems, Inc.
Advanced OSPF, NLSP, IS IS and Troubleshooting 316
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