CCNP7 Tshoot

INSTRUCTORS:

Categories

Cisco , cursos

Chapter 1 Introduction to Troubleshooting and Network Maintenance

 

Introduction to Troubleshooting

 

Defining Troubleshooting

The Value of Structured Troubleshooting

A Structured Approach

  1. Problem Report
  2. Collect Information
  3. Examine Collected Information
  4. Eliminate Potential Causes
  5. Propose an Hypothesis
  6. Verify Hypothesis
  7. Problem Resolution

 

Popular Troubleshooting Methods

 

The Top-Down Method

The Bottom-Up Method

The Divide-and-Conquer Method

The Following the Traffic Path Method

The Comparing Configurations Method

The Component Swapping Method

Practice Exercise: Selecting a Troubleshooting Approach

 

Introduction to Network Maintenance

 

Defining Network Maintenance

Proactive Versus Reactive Network Maintenance

Well-Known Network Maintenance Models

Example of Adapting a Network Maintenance Model

 

Common Maintenance Procedures

 

Routine Maintenance Tasks

Scheduled Maintenance

Managing Network Changes

Maintaining Network Documentation

Restoring Operations After a Failure

Measuring Network Performance

 

The Troubleshooting and Network Maintenance Relationship

 

Maintaining Current Network Documentation

Establishing a Baseline

Communication

Change Management

 

Chapter 2 Troubleshooting and Maintenance Tools

 

The Troubleshooting and Network Maintenance Toolkit

 

Network Documentation Tools

Basic Tools

            CLI Tools

            GUI Tools

            Recovery Tools

            Logging Tools

            Network Time Protocol as a Tool

Advanced Tools

            Overview of SNMP and NetFlow

            Creating a Baseline with SNMP and NetFlow

            SNMP

            NetFlow

Cisco Support Tools

 

Using Cisco IOS to Verify and Define the Problem

 

Ping

Telnet

Traceroute

 

Using Cisco IOS to Collect Information

 

Filtering the Output of show Commands

Redirecting show Command Output to a File

Troubleshooting Hardware

 

Collecting Information in Transit

 

Performing Packet Captures

SPAN

RSPAN

 

Using Tools to Document a Network

 

Chapter 3 Troubleshooting Device Performance

 

Troubleshooting Switch Performance Issues

Cisco Catalyst Switch Troubleshooting Targets

TCAM Troubleshooting

High CPU Utilization Troubleshooting on a Switch

Troubleshooting Router Performance Issues

Excessive CPU Utilization

Understanding Packet-Switching Modes (Routers and Multilayer

Switches)

Troubleshooting Packet-Switching Modes

Excessive Memory Utilization

 

Part II Troubleshooting Cisco Catalyst Switch Features

Chapter 4 Troubleshooting Layer 2 Trunks, VTP, and VLANs

 

Frame-Forwarding Process

Troubleshooting Trunks

 

Encapsulation Mismatch

Incompatible Trunking Modes

VTP Domain Name Mismatch

Native VLAN Mismatch

Allowed VLANs

 

Troubleshooting VTP

 

Domain Name Mismatch

Version Mismatch

Mode Mismatch

Password Mismatch

Higher Revision Number

 

Troubleshooting VLANs

 

Incorrect IP Addressing

Missing VLAN

Incorrect Port Assignment

 

The MAC Address Table

Layer 2 Trouble Tickets

 

Trouble Ticket 4-1

Trouble Ticket 4-2

 

Chapter 5 Troubleshooting STP and Layer 2 EtherChannel

Spanning Tree Protocol Overview

 

Reviewing STP Operation

            Determining Root Port

            Determining Designated Port

            Determining Nondesignated Port

 

Collecting Information About an STP Topology

 

Gathering STP Information

Gathering MSTP Information

 

STP Troubleshooting Issues

 

Corruption of a Switch’s MAC Address Table

Broadcast Storms

 

Troubleshooting STP Features

 

PortFast

BPDU Guard

BPDU Filter

Root Guard

Loop Guard

 

STP Trouble Tickets

 

Trouble Ticket 5-1

Trouble Ticket 5-2

Trouble Ticket 5-3

 

Troubleshooting Layer 2 EtherChannel

 

Reviewing Layer 2 EtherChannel

 

EtherChannel Trouble Tickets

 

Trouble Ticket 5-4

Trouble Ticket 5-5

 

Chapter 6 Troubleshooting Inter-VLAN Routing and Layer 3 EtherChannels 209

Troubleshooting a Router-on-a-Trunk/Stick

Router-on-a-Trunk/Stick Trouble Tickets

 

Trouble Ticket 6-1

Trouble Ticket 6-2

 

Troubleshooting Switched Virtual Interfaces

 

Reviewing SVIs

Troubleshooting SVIs

 

SVI Trouble Tickets

 

Trouble Ticket 6-3

Trouble Ticket 6-4

 

Troubleshooting Routed Ports

Routed Ports Trouble Tickets

 

Trouble Ticket 6-5

 

Troubleshooting Layer 3 EtherChannel

Layer 3 EtherChannel Trouble Tickets

 

Trouble Ticket 6-6

 

Chapter 7 Troubleshooting Switch Security Features

Troubleshooting Port Security

 

Common Port Security Issues

            Port Security Configured but Not Enabled

            Static MAC Address Not Configured Correctly

            Maximum Number of MAC Addresses Reached

            Legitimate Users Being Blocked Because of Violation

            Running Configuration Not Saved to Startup Configuration

 

Port Security Trouble Tickets

 

Trouble Ticket 7-1

 

Troubleshooting Spoof-Prevention Features

 

DHCP Snooping

Dynamic ARP Inspection

IP Source Guard

 

Spoof-Prevention Features Trouble Tickets

 

Trouble Ticket 7-2

 

Troubleshooting Access Control

 

Protected Ports

Private VLANs

VACLs

 

Chapter 8 Troubleshooting First-Hop Redundancy Protocols

 

Troubleshooting HSRP

 

Reviewing HSRP

HSRP Converging After a Failure

HSRP Verification and Troubleshooting

            Virtual Router MAC Address

            Interface Tracking

            Verifying First Hop

            Debug

 

HSRP Trouble Tickets

 

Trouble Ticket 8-1

Trouble Ticket 8-2

Trouble Ticket 8-3

 

Troubleshooting VRRP

 

Reviewing VRRP

VRRP Verification and Troubleshooting

            Virtual Router MAC Address

            Object Tracking

            Verifying First Hop

 

VRRP Trouble Tickets

 

Trouble Ticket 8-4

Trouble Ticket 8-5

 

Troubleshooting GLBP

 

Reviewing GLBP

GLBP Verification and Troubleshooting

            Virtual Router MAC Addresses

GLBP Object Tracking

Verifying GLBP First Hop

 

GLBP Trouble Tickets

 

Trouble Ticket 8-6

Trouble Ticket 8-7

 

Comparing HSRP, VRRP, and GLBP

 

Part III Troubleshooting Router Features

Chapter 9 Troubleshooting IPv4 Addressing and Addressing Technologies

 

Troubleshooting IPv4 Addressing

 

IPv4 Addressing Issues

Determining IP Addresses Within a Subnet 1

 

Troubleshooting DHCP for IPv4

 

Reviewing DHCP Operations

Potential DHCP Troubleshooting Issues

DHCP Troubleshooting Commands

 

Troubleshooting NAT

 

Reviewing NAT

NAT Troubleshooting Issues

NAT Troubleshooting Commands

 

IPv4 Addressing and Addressing Technologies Trouble Tickets

 

Trouble Ticket 9-1

Trouble Ticket 9-2

Trouble Ticket 9-3

 

Chapter 10 Troubleshooting IPv6 Addressing and Addressing Technologies

 

Troubleshooting IPv6 Addressing

 

IPv6 Addressing Review

Neighbor Solicitation and Neighbor Advertisement

EUI-64

 

Troubleshooting IPv6 Address Assignment

 

Stateless Address Autoconfiguration/SLAAC

Stateful DHCPv6

Stateless DHCPv6

DHCPv6 Operation

DHCPv6 Relay Agent

 

IPv6 Addressing Trouble Tickets

 

Trouble Ticket 10-1

Trouble Ticket 10-2

 

Chapter 11 Troubleshooting IPv4 and IPv6 ACLs and Prefix Lists

 

Troubleshooting IPv4 ACLs

 

Reading an IPv4 ACL

Using an IPv4 ACL for Filtering

Using a Time-Based IPv4 ACL

 

IPv4 ACL Trouble Tickets

 

Trouble Ticket 11-1

 

Troubleshooting IPv6 ACLs

 

Reading an IPv6 ACL

Using an IPv6 ACL for Filtering

 

IPv6 ACL Trouble Tickets

 

Trouble Ticket 11-2

 

Troubleshooting Prefix Lists

 

Reading a Prefix List

Prefix List Processing

 

Prefix List Trouble Tickets

 

Trouble Ticket 11-3

 

Chapter 12 Troubleshooting Basic IPv4/IPv6 Routing and GRE Tunnels

 

Packet-Forwarding Process

 

Reviewing Layer 3 Packet-Forwarding Process

Troubleshooting the Packet-Forwarding Process

 

Troubleshooting Routing Information Sources

 

Data Structures and the Routing Table

Sources of Route Information

 

Troubleshooting Static Routes

 

IPv4 Static Routes

IPv6 Static Routes

 

Static Routing Trouble Tickets

 

Trouble Ticket 12-1

Trouble Ticket 12-2

 

Troubleshooting GRE Tunnels

 

Chapter 13 Troubleshooting RIPv2 and RIPng

 

Troubleshooting RIPv2

 

Missing RIPv2 Routes

Interface Is Shut Down

Wrong Subnet

Bad or Missing Network Statement

Passive Interface

Wrong Version

Max Hop Count Exceeded

Authentication

Route Filtering

Split Horizon

Autosummarization

Better Source of Information

ACLs

Load Sharing

Other RIP Issues

Missing Default Route

Route Summarization

 

Troubleshooting RIPng

RIPv2 and RIPng Trouble Tickets

 

Trouble Ticket 13-1

Trouble Ticket 13-2

Trouble Ticket 13-3

 

Chapter 14 Troubleshooting EIGRP

 

Troubleshooting EIGRP for IPv4

 

Troubleshooting EIGRP for IPv4 Neighbor Adjacencies

Interface Is Down

Mismatched Autonomous System Numbers

Incorrect Network Statement

Mismatched K Values

Passive Interface

Different Subnets

Authentication

ACLs

Timers

Troubleshooting EIGRP for IPv4 Routes

Bad or Missing Network Command

Better Source of Information

Route Filtering

Stub Configuration

Interface Is Shut Down

Split-horizon

Troubleshooting Miscellaneous EIGRP for IPv4 Issues

Feasible Successors

Discontiguous Networks and Autosummarization

Route Summarization

Load Balancing

 

EIGRP for IPv4 Trouble Tickets

 

Trouble Ticket 14-1

Trouble Ticket 14-2

Trouble Ticket 14-3

 

Troubleshooting EIGRP for IPv6

 

Troubleshooting EIGRP for IPv6 Neighbor Issues

Interface Is Down

Mismatched Autonomous System Numbers

Mismatched K Values

Passive Interfaces

Mismatched Authentication

Timers

Interface Not Participating in Routing Process

ACLs

Troubleshooting EIGRP for IPv6 Route

Interface Not Participating in Routing Process

Better Source of Information

Route Filtering

Stub Configuration

Split-horizon

 

EIGRP for IPv6 Trouble Tickets

 

Trouble Ticket 14-4

 

Troubleshooting Named EIGRP Configurations

 

Named EIGRP Verification Commands

 

Named EIGRP Trouble Tickets

 

Trouble Ticket 14-5

 

Chapter 15 Troubleshooting OSPF

 

Troubleshooting OSPFv2

 

Troubleshooting OSPFv2 Neighbor Adjacencies

Interface Is Down

Interface Not Running the OSPF Process

Mismatched Timers

Mismatched Area Numbers

Mismatched Area Type

Different Subnets

Passive Interface

Mismatched Authentication Information

ACLs

MTU Mismatch

Duplicate Router IDs

Mismatched Network Types

Troubleshooting OSPFv2 Routes

Interface Not Running the OSPF Process

Better Source of Information

Route Filtering

Stub Area Configuration

Interface Is Shut Down

Wrong Designated Router Was Elected

Duplicate Router IDs

Troubleshooting Miscellaneous OSPFv2 Issues

Tracking OSPF Advertisements Through a Network

Route Summarization

Discontiguous Areas

Load Balancing

Default Route

 

OSPFv2 Trouble Tickets

 

Trouble Ticket 15-1

Trouble Ticket 15-2

Trouble Ticket 15-3

 

Troubleshooting OSPFv3 for IPv6

 

OSPFv3 Troubleshooting Commands

 

OSPFv3 Trouble Tickets

 

Trouble Ticket 15-4

Trouble Ticket 15-5

 

Troubleshoot OSPFv3 Address Families

 

OSPFv3 Address Family Troubleshooting

 

OSPFv3 AF Trouble Tickets

 

Trouble Ticket 15-6

 

Chapter 16 Troubleshooting Route Maps and Policy-Based Routing

 

Troubleshooting Route Maps

How to Read a Route Map

 

Troubleshooting Policy-Based Routing

 

PBR

 

Policy-Based Routing Trouble Tickets

 

Trouble Ticket 16-1

Trouble Ticket 16-2

Trouble Ticket 16-3

 

Chapter 17 Troubleshooting Redistribution

 

Troubleshooting IPv4 and IPv6 Redistribution

 

Route Redistribution Overview

Troubleshooting Redistribution into RIP

Troubleshooting Redistribution into EIGRP

Troubleshooting Redistribution into OSPF

Troubleshooting Redistribution into BGP

Troubleshooting Redistribution with Route Maps

 

Redistribution Trouble Tickets

 

Trouble Ticket 17-1

Trouble Ticket 17-2

Trouble Ticket 17-3

Trouble Ticket 17-4

 

Troubleshooting Advanced Redistribution Issues

 

Troubleshooting Suboptimal Routing Caused by Redistribution

Troubleshooting Routing Loops Caused by Redistribution

 

Chapter 18 Troubleshooting BGP

 

Troubleshooting BGP Neighbor Adjacencies

 

Interface Is Down

Layer 3 Connectivity Is Broken

Path to Neighbor Is via Default Route

Neighbor Does Not Have a Route to the Local Router

Incorrect neighbor Statement

BGP Packets Sourced from Wrong IP Address

ACLs

TTL of BGP Packet Expires

Mismatched Authentication

Misconfigured Peer Groups

Timers

 

Troubleshooting BGP Routes

 

Missing or Bad network mask Command

Next-Hop Router Not Reachable

BGP Split-Horizon Rule

Better Source of Information

Route Filtering

 

Troubleshooting BGP Path Selection

 

Understanding the Best Path Decision-Making Process

Private Autonomous System Numbers

Using debug Commands

 

Troubleshooting BGP for IPv6

BGP Trouble Tickets

 

Trouble Ticket 18-1

Trouble Ticket 18-2

Trouble Ticket 18-3

 

MP-BGP Trouble Tickets

Trouble Ticket 18-4

 

Part IV Troubleshooting Management

Chapter 19 Troubleshooting Management Protocols and Tools

 

Management Protocols Troubleshooting

 

NTP Troubleshooting

Syslog Troubleshooting

SNMP Troubleshooting

 

Management Tools Troubleshooting

 

Cisco IOS IPSLA Troubleshooting

Object Tracking Troubleshooting

SPAN and RSPAN Troubleshooting

 

Management Protocols and Tools Trouble Tickets

 

Trouble Ticket 19-1

 

Chapter 20 Troubleshooting Management Access

 

Console and vty Access Troubleshooting

Console Access Troubleshooting

vty Access Troubleshooting

Telnet

SSH

Password Encryption Levels

 

Cisco IOS AAA Troubleshooting

Management Access Trouble Tickets

 

Trouble Ticket 20-1

Trouble Ticket 20-2

Trouble Ticket 20-3