Module 1 - 7: Outline
Module : Documenting and Baselining the Network
Module Overview
Network Baselining
Network baselining overview
Planning for the first baseline
Identifying devices and ports of interest
Determining the duration of the baseline
Using the baseline data
Identifying undesired network behavior
Identifying thresholds
Predicting long-term performance and capacity trends
Verifying policies
Network Configuration Documentation
Network configuration documentation overview
Identifying the components of a network configuration table
Identifying the components of a topology diagram
Discovering network configuration information
Describing the process of creating network documentation
Creating network documentation
Building-Block Approach
Identifying the components of an end-system configuration table
Identifying the components of an end-system topology table
Identifying commands and applications used to discover information about end-system configuration
Discovering end-system configuration information
Creating end-system network configuration documentation
Module: Summary
Module: Quiz

Module : Troubleshooting Methodologies and Tools
Module Overview
Using a Layered Architectural Model to Describe Data Flow
Encapsulating data
OSI model versus TCP/IP model
Position of network devices in layered model
Troubleshooting Approaches
General troubleshooting process
Bottom-up
Top-down
Divide and conquer
Guidelines for selecting an approach
Gathering Symptoms
Gathering symptoms for a network problem
Gathering symptoms from an end-user: hardware
Gathering symptoms from an end-user: software
Questions to ask an end-user
Flow charts for gathering network and end-user symptoms
Network Management Tools
Network management system frameworks
Knowledge base tools
Performance measurement and reporting tools
Event and fault management tools
Policy management tools
Module: Summary
Module: Quiz

Module : Troubleshooting at the Physical Layer
Module Overview
Characteristics of Physical Layer Optimization Problems
Performance lower than baseline
Exceeding cable design limits, poor quality cabling and connections
Noise
Collisions
Other data transmission issues
Resources
Utilization
Console messages
Identifying Physical Layer Problems
Power related
Cabling faults – CAT5
Cabling faults – fiber and coax
Hardware
Collision based problems – shared media
Configuration script errors
CPU overload
Isolating Physical Layer Problems
Methodology
Tools for the job
Bad cabling
Cabling incorrect
Operational statistics
Implementing Physical Layer Solutions
Solving common problems – Methodology
ARP commands
Solving common problems – Windows, UNIX/Mac OS end-system commands
Solving common problems – Cisco IOS commands
Redundancy
Solving common problems – support resources
Module: Summary
Module: Quiz

Module : Layer 2 Troubleshooting
Module Overview
Characteristics of Data Link Layer Problems
Data link layer problems overview
No component above the data link layer is functional
The network is functional, but operating at less than the baseline level
Framing errors
Encapsulation errors
Layer 2 to Layer 3 address mapping errors
Critical characteristics – no network layer connectivity
Upper layer component operation
Critical characteristics – console messages
Troubleshooting Switched Ethernet Networks
Troubleshooting the Spanning Tree Protocol
Troubleshooting STP loops
Preventing STP loops
Troubleshooting incorrect STP root configuration
Troubleshooting Ethernet broadcast traffic
Troubleshooting Ethernet switch flooding
Troubleshooting VTP misconfiguration
Troubleshooting EtherChannel
Troubleshooting Gateway Redundancy Protocols
Gateway redundancy
HSRP configuration and verification
How to debug HSRP operations
Troubleshooting ISDN
T1 framing errors
Troubleshooting ISDN primary rate switch types
Troubleshooting ISDN BRI to telco communications
Troubleshooting ISDN BRI dialer problems
Debugging ISDN call setup failures
Troubleshooting Frame Relay
Steps for troubleshooting Frame Relay
The show frame-relay lmi command
The show frame-relay pvc command
Frame Relay encapsulation type
Troubleshooting Frame Relay using the line status
Ping the local IP address on a multipoint Frame Relay
Reconfiguring a subinterface
PPP and Layer 2 Considerations for Routed and Routing Protocols
Link Control Protocol
Troubleshooting PPP authentication PAP
Troubleshooting PPP authentication CHAP
IP split horizon checking
OSPF in an NBMA environment
The keyword broadcast
Excessive fragmentation
Module: Summary
Module: Quiz

Module : Layer 3 Troubleshooting
Module Overview
Troubleshooting Network Layer Problems
What are network layer problems?
Isolating the problem methodology
Static routes, dynamic routing, summarization, redistribution, and combinations
Troubleshooting Static Routes
Static routes and classful lookups
Static routes and intermediate addresses
Static routes optimization with serial networks
Static routes optimization with Ethernet networks
Recurring static route installation and deletion
Using discard routes
Common IGP Routing Protocol Issues, Causes, and Solutions
Introduction
Missing or incorrect network or neighbor statement
Layer 1 or 2 down
Distribute-list in/out blocking
Access list blocking
Advertised network interface is down
Passive interface
Troubleshooting RIP
Incompatible RIP version types
Mismatched authentication key
Reaches RIP hop count limit
Discontiguous networks
Flapping routes
Large routing tables
Troubleshooting EIGRP
Mismatched K values
Mismatched AS number
Stuck in active – determining the problem
Stuck in active – methodology for troubleshooting
Stuck in active – the ultimate solution
Duplicate router IDs
EIGRP error messages
Troubleshooting OSPF
Mismatched parameters
OSPF state issues
One side of point-to-point link is unnumbered
ABR not generating Type 4 summary LSA
Forwarding address is not known through the intra-area or inter-area route
Route summarization problems
CPUHOG problems
SPF calculation and route flapping
Troubleshooting IS-IS
IS-IS adjacency problems
Some or all of the adjacencies are not coming up
Adjacency is stuck in INIT state
ES-IS adjacency instead of IS-IS adjacency formed
Route advertisement problems
Route flapping problem
Troubleshooting BGP
Troubleshooting BGP neighbor relationships
Troubleshooting BGP route advertisements
Troubleshooting routes not being installed in the IP routing table
The BGP next hop is not reachable
BGP routes getting dampened
Troubleshooting outbound and inbound BGP policy issues
Traffic takes a different interface than what is shown in routing table
Troubleshooting Redistribution
Redistribution problem with RIP
Redistribution problems with EIGRP
Redistribution problems with OSPF
Redistribution problems with IS-IS
Redistribution problems with BGP
Module: Summary
Module: Quiz

Module : Layer 4 Troubleshooting
Module Overview
Troubleshooting Transport Layer Issues on the Router
Common issues with extended ACLs
Gathering information on ACL operation
Optimizing access list operation
Common issues with IP NAT
Gathering information on NAT configuration and operation
Other useful information
Troubleshooting Transport Layer Issues on Network Hosts
Common transport layer issues with IP networks
Gathering transport layer information on Windows machines
Gathering transport layer information on UNIX machines
Common issues with NetBIOS networks
Gathering NetBIOS information
Troubleshooting Complex Network Systems
Identifying complex transport layer problems
Disassembling the problem
Solving the component problems
Dynamic NAT and extended ACLs
TCP load distribution with NAT
Module: Summary
Module: Quiz

Module : Layer 1 - 7 Troubleshooting
Module Overview
Troubleshooting the Application Layer
Overview
Eliminating Layers 1-3
Eliminating Layer 4
Isolating application layer problems
Accessing support resources
Correcting application layer problems
Gathering Information on Application Layer Problems
Overview
Common TCP/IP commands
Platform specific TCP/IP utilities
Cisco IOS commands
System logs
Syslog destinations
Deciphering syslog messages
Protocol analyzers
Network management systems
Troubleshooting TCP/IP Application Layer Protocols
Overview
Terminals and consoles
Web traffic
Electronic mail
File transfer
Network management and time protocols
Name resolution
Dynamic Host Configuration Protocol (DHCP)
Troubleshooting TCP/IP Application Layer Problems
Troubleshooting Telnet problems
Troubleshooting HTTP problems
Troubleshooting e-mail problems
Troubleshooting TFTP problems
Troubleshooting DNS problems
Module: Summary
Module: Quiz



Close Window
All contents copyright ©2001-2005 Cisco Systems, Inc. All rights reserved.