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

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Printed in USA. 2 666 316 0934_04F9_c4 Seq# Checksum Link count 0x800001D0 0xA180 0 Seq# Checksum 0x80000203 0x4153 0x8000027A 0x10AB 69 © 1999, Cisco Systems, Inc. 1 Supports only single TOS(TOS0) routes SPF schedule delay 5 secs, Hold time between two SPFs 10 secs Minimum LSA interval 5 secs. 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.

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.

Checksum Sum 0x22812 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. ) Database not getting synchronized 316 0934_04F9_c4 © 1999, Cisco Systems, Inc. Copyright © 1998, 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.

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