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1© 2003, Cisco Systems, Inc. All rights reserved.
Documenting Baselining & Troubleshooting
Halmstad University
Olga Torstensson
035-167575 [email protected]
222© 2003, Cisco Systems, Inc. All rights reserved.
Documenting and Baselining the Network
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
444© 2003, Cisco Systems, Inc. All rights reserved.
Network Utilisation
555© 2003, Cisco Systems, Inc. All rights reserved.
Station Statistics
666© 2003, Cisco Systems, Inc. All rights reserved.
Devices of Interest
777© 2003, Cisco Systems, Inc. All rights reserved.
Ports of Interest
888© 2003, Cisco Systems, Inc. All rights reserved.
Duration of Baseline
999© 2003, Cisco Systems, Inc. All rights reserved.
Bandwidth Utilisation
101010© 2003, Cisco Systems, Inc. All rights reserved.
Using the Baseline Data
111111© 2003, Cisco Systems, Inc. All rights reserved.
Topology Diagram Components
121212© 2003, Cisco Systems, Inc. All rights reserved.
Topology Example
131313© 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}.
141414© 2003, Cisco Systems, Inc. All rights reserved.
Creating Network Documentation
151515© 2003, Cisco Systems, Inc. All rights reserved.
Components of Topology Diagram
161616© 2003, Cisco Systems, Inc. All rights reserved.
Components of Topology Diagram
171717© 2003, Cisco Systems, Inc. All rights reserved.
Troubleshooting
Methodologies & Tools
181818© 2003, Cisco Systems, Inc. All rights reserved.
Data Encapulation
191919© 2003, Cisco Systems, Inc. All rights reserved.
OSI v TCP/IP
202020© 2003, Cisco Systems, Inc. All rights reserved.
General Troubleshooting
212121© 2003, Cisco Systems, Inc. All rights reserved.
Selecting a Troubleshooting Approach
222222© 2003, Cisco Systems, Inc. All rights reserved.
Questions to Ask
232323© 2003, Cisco Systems, Inc. All rights reserved.
Troubleshooting Commands
242424© 2003, Cisco Systems, Inc. All rights reserved.
Gathering Symptoms from End User Hardware
252525© 2003, Cisco Systems, Inc. All rights reserved.
Router diagnostics
showshow show buffers, show interfaces, show controllersshow buffers, show interfaces, show controllers show memory, show processesshow memory, show processes
debugdebug Disabled with – ‘no debug all’ ‘undebug all’Disabled with – ‘no debug all’ ‘undebug all’ High processor overhead - use sparinglyHigh processor overhead - use sparingly Minimise impact –Minimise impact –
CPU awarenessCPU awareness show processes cpushow processes cpu
262626© 2003, Cisco Systems, Inc. All rights reserved.
Interacting with technical support
• show tech-support
