1. 1 © 2003, Cisco Systems, Inc. All rights reserved. Documenting Baselining & Troubleshooting Halmstad University Olga Torstensson 035-167575 olga.torstensson@ide.hh.seolga.torstensson@ide.hh.se

2. 222 © 2003, Cisco Systems, Inc. All rights reserved. Documenting and Baselining the Network

3. 333 © 2003, Cisco Systems, Inc. All rights reserved. Baseline To effectively troubleshoot a network, a baseline must first be established. The baseline information will be included in the network documentation network monitoring data collection

4. 444 © 2003, Cisco Systems, Inc. All rights reserved. Network Utilisation

5. 555 © 2003, Cisco Systems, Inc. All rights reserved. Station Statistics

6. 666 © 2003, Cisco Systems, Inc. All rights reserved. Devices of Interest

7. 777 © 2003, Cisco Systems, Inc. All rights reserved. Ports of Interest

8. 888 © 2003, Cisco Systems, Inc. All rights reserved. Duration of Baseline

9. 999 © 2003, Cisco Systems, Inc. All rights reserved. Bandwidth Utilisation

10. 10 © 2003, Cisco Systems, Inc. All rights reserved. Using the Baseline Data

11. 11 © 2003, Cisco Systems, Inc. All rights reserved. Topology Diagram Components

12. 12 © 2003, Cisco Systems, Inc. All rights reserved. Topology Example

13. 13 © 2003, Cisco Systems, Inc. All rights reserved. Discover Configuration show version show ip interfaces. show ip interfaces brief. show ip interface {interface-name} for each interface or enter show interfaces to see a list of all interfaces at once. show ip protocols. show spanning-tree or show spantree. show cdp neighbors. show cdp entry {device id}.

14. 14 © 2003, Cisco Systems, Inc. All rights reserved. Creating Network Documentation

15. 15 © 2003, Cisco Systems, Inc. All rights reserved. Components of Topology Diagram

16. 16 © 2003, Cisco Systems, Inc. All rights reserved. Components of Topology Diagram

17. 17 © 2003, Cisco Systems, Inc. All rights reserved. Troubleshooting Methodologies & Tools

18. 18 © 2003, Cisco Systems, Inc. All rights reserved. Data Encapulation

19. 19 © 2003, Cisco Systems, Inc. All rights reserved. OSI v TCP/IP

20. 20 © 2003, Cisco Systems, Inc. All rights reserved. General Troubleshooting

21. 21 © 2003, Cisco Systems, Inc. All rights reserved. Selecting a Troubleshooting Approach

22. 22 © 2003, Cisco Systems, Inc. All rights reserved. Questions to Ask

23. 23 © 2003, Cisco Systems, Inc. All rights reserved. Troubleshooting Commands

24. 24 © 2003, Cisco Systems, Inc. All rights reserved. Gathering Symptoms from End User Hardware

25. 25 © 2003, Cisco Systems, Inc. All rights reserved. Router diagnostics  show  show buffers, show interfaces, show controllers  show memory, show processes  debug  Disabled with – ‘no debug all’ ‘undebug all’  High processor overhead - use sparingly  Minimise impact –  CPU awareness  show processes cpu

26. 26 © 2003, Cisco Systems, Inc. All rights reserved. Interacting with technical support show tech-support