Network Troubleshooting : Network Troubleshooting Accessing the WAN – Chapter 8
Objectives : Objectives Establish a network baseline Describe troubleshooting methodologies and troubleshooting tools Describe the common issues that occur during WAN implementation Troubleshoot enterprise network implementation issues
Document the Network : Document the Network Network topology diagram Network configuration table End-system configuration table Network baseline
Establish a Network Baseline : Establish a Network Baseline
Network Baseline Tools : Network Baseline Tools
Troubleshooting Methodology : Troubleshooting Methodology Which method do you use to troubleshoot?
Types of Systematic Troubleshooting : Types of Systematic Troubleshooting Bottom Up Approach Start at physical layers Many problems are Layer 1, but can be time consuming Top-Down Approach Start at the application layer Must find the problem application (lower layer problems can mask as upper layer problems) Divide-and-Conquer Approach Decide which layer to start, troubleshoot both directions Need user input to decide where to begin Success at one layer may indicate success at other layers
Troubleshooting Using Layers : Troubleshooting Using Layers Point 1 of layered models: simplify troubleshooting
PowerPoint Presentation : Useful Troubleshooting commands Command Description What Layer it Tests ping {host | ip address} Sends an echo request packet to an address and waits for a reply. 1 to 3 traceroute {destination] Identifies the path a packet takes through the networks 1 to 3 telnet {host | ip address} Connects an IP address using the Telnet application 1 to 7 show ip interface brief Displays a summary of the status of all interfaces on a device 1 to 3 Show ip route Displays the current state of the IP routing table 1 to 3 show running- config interface Displays the contents of the currently running configuration file for a particular interface 1 to 4 [no] debug ? Displays a list of option for enabling or disabling debugging events on a device 1 to 7 show protocols Displays the configured protocols 1 to 4
PowerPoint Presentation : Troubleshooting Tools Software Tools Network Management Systems Baselining Tools Knowledge Bases Protocol Analyzers WhatsUp Gold Network Uptime Cisco OptiView Protocol Expert SolarWinds LANsurveyor OpenView Hardware Tools Network Analysis Modules (NAM) Cable Testers Cable Analyzers Network Analyzers Cisco Network Analysis Module Traffic Analyzer Cable IQ DTX Cable Analyzer OptiView Series III Integrated Network Analyzer
WAN Implementation : WAN Implementation
Useful SHOW Commands : Useful SHOW Commands Commands Description show version Displays uptime and version information show ip interface [brief] Displays a summary of the status of all interfaces on a device show interface Displays detailed output for each interface show ip route Displays the contents of the routing table show arp Displays the contents of the routing table show running- config Displays the current configuration show port Displays the status of ports on a switch show vlan Displays the status of VLANs on a switch show tech-support Runs other show commands and provides many pages of detailed output
Identify the Three WAN Topologies : Identify the Three WAN Topologies
Troubleshoot Enterprise Networks @ L1 : Troubleshoot Enterprise Networks @ L1
Troubleshoot Enterprise Networks @ L2 : Troubleshoot Enterprise Networks @ L2
Troubleshoot Enterprise Networks @ L3 : Troubleshoot Enterprise Networks @ L3
Troubleshoot Enterprise Networks @ L4 : Troubleshoot Enterprise Networks @ L4
Layer 8 Issues – the End User : Layer 8 Issues – the End User Confirm the problem Ask questions that are pertinent to the problem Time frame – when did the problem start? Can the problem be recreated? What occurred prior to the problem? Speak at an appropriate technical level Save the Geek Speak for the IT department!
Chapter 8 Labs : Chapter 8 Labs Lab 8.5.1: Troubleshooting Enterprise Networks 1
PowerPoint Presentation :