Tcl scripting for Cisco IOS

Format:

Book

Author/Creator:

Blair, Raymond N., Author.

Contributor:

Durai, Arvind, Contributor.

Lautmann, John, Contributor.

Series:

Networking Technology

Networking technology series Tcl scripting for Cisco IOS

Language:

English

Subjects (All):

Cisco IOS.

Tcl (Computer program language).

Physical Description:

1 online resource : ill.

Edition:

1st edition

Place of Publication:

[Place of publication not identified] Cisco Press 2010

Language Note:

English

System Details:

text file

Summary:

A guide to building and modifying Tcl scripts to automate network administration tasks Streamline Cisco network administration and save time with Tcl scripting Cisco networking professionals are under relentless pressure to accomplish more, faster, and with fewer resources. The best way to meet this challenge is to automate mundane or repetitive tasks wherever possible. In this book, three Cisco experts show you how to use Tcl scripting for Cisco IOS devices to do just that. You’ll learn easy techniques for creating, using, and modifying Tcl scripts that run directly on Cisco network devices from the Cisco IOS command line. The authors first teach basic Tcl commands and concepts for capturing and manipulating data and for querying or controlling Cisco equipment. Building on these core skills, they show you how to write scripts that automate and streamline many common IOS configuration, monitoring, and problem-solving tasks. The authors walk through the entire script development process, including planning and flowcharting what you want to accomplish, formatting your code, adding comments, and troubleshooting script errors. They also present many downloadable sample scripts, along with practical guidance for adapting them to your own environment. Whatever your role in managing, monitoring, or securing Cisco IOS networks and equipment, this book will help you get the job done more rapidly and efficiently. Ray Blair, CCIE No. 7050, is a Cisco vertical solutions architect specializing in large network designs. He has more than 20 years of experience in designing, implementing, and maintaining networks, and maintains three CCIE certifications. Arvind Durai, CCIE No. 7016, Advanced Services Technical Leader for Cisco, specializes in supporting major Cisco enterprise customers in finance, manufacturing, e-commerce, government, and healthcare. He holds CCIEs in Routing and Switching, and in Security. John Lautmann, Cisco Software Engineer, has developed and enhanced network management software for twelve years, and holds six patents. He has helped develop new Cisco IOS features ranging from data link switching to IOS Tcl Interpeter and digitally signed Tcl scripts. Automate routine administration tasks you’ve always performed manually Instantly collect and modify IOS router configurations and other data Write Syslog scripts to document failures, monitor network health, collect statistics, and send alarm messages Implement automated network performance...

Contents:

Cover

Contents

Introduction

Chapter 1 The Origin of Tcl

Tcl and Cisco IOS Software

Embedded Event Manager and Tcl

Restriction of Tcl in IOS

Tcl with EEM Support in IOS

Using Tcl Scripts in the Network

Troubleshooting Problems

Monitoring the Network

Adding Intelligence to Cisco IOS Protocols

Summary

References

Chapter 2 Tcl Interpreter and Language Basics

Simple Variables in Tcl

Storing Variables

Viewing Variables

The append Command

The incr Command

Representation of Variables in Tcl

Lists

Procedures

for Command

foreach Command

while Command

Arrays

if Command

switch Command

Files

Chapter 3 Tcl Functioning in Cisco IOS

Understanding the Tcl Interpreter in Cisco IOS

Using Cisco IOS Exec-Mode Parser in the Tcl Shell

Entering an IOS Command into the Tcl Command Interpreter

Using Tcl to Enter Commands

Copying a Tcl Script to a Cisco IOS Device

Fetching a Cisco IOS Tcl Script from a Remote Device

Using Tcl to Examine the Cisco IOS Device Configuration

Using Tcl to Modify the Router Configuration

Using Tcl with SNMP to Check MIB Variables

Other Uses of SNMP

Enabling SNMP on a Cisco IOS Device

Querying the Configuration of a Cisco IOS Device Using SNMP

Modifying the Configuration of a Cisco IOS Device Using SNMP

Chapter 4 Embedded Event Manager (EEM)

EEM Architecture

Policies

EEM Server

Event Detectors

Software Release Support for EEM

Platform and IOS Considerations for EEM

Writing an EEM Applet

Practical Example of an Event Trigger

Using Object Tracking as an Event Trigger

Creating Applet Actions

Examples of EEM Applets

Using EEM and Tcl Scripts

Programming Policies with Tcl

Tcl Example Used to Check for Interface Errors.

Tcl Example Used to Check the CPU Utilization

Chapter 5 Advanced Tcl Operation in Cisco IOS

Introduction to the Syslog Protocol

Configuring Syslog Server Parameters in Cisco IOS

Syslog Tcl Script Example

Syslog Tcl Script Sample Output

Sending Syslog Messages to a File

Syslog Server Script Procedures

Syslog Server Script Body

Putting the Syslog Script into Operation

Introduction to Embedded Syslog Manager

Filtering Syslog Messages

ESM Global Variables

Rebuilding a Syslog Message from Its Components

Displaying/Adding ESM Tcl Script Filters

Introduction to Embedded Menu Manager

Using Tcl as a Web Server

Obtaining a Free Web Server Application

Reverse Engineering the Web Server

Creating Your Own Simple Web Page

Creating a Web Page Using IOS show Commands

Adding User Input to the Web Page

Introduction to IP SLA

Adding the IP SLA Measurement to the Web Page

Tcl Script Refresh Policy

SNMP Proxy Event Detector

Remote-Procedure Call Requests

Multiple-Event Support for Event Correlation

Using the clear Command

Chapter 6 Tcl Script Examples

Creating an Application from Start to Finish

Determine What You Want to Accomplish

Creating a Flowchart

Deciding What the User Interface Should Look Like

Write the Code in Pseudo-Code

Before You Begin

Starting to Program the Application

Troubleshooting as You Go

Using Tcl to Troubleshoot Network Problems

Monitoring the Console for Events

Creating a Web Application for Remote SNMP Graphing

Chapter 7 Security in Tcl Scripts

Introduction to PKI Infrastructure

PKI Prerequisite

Confidentiality with PKI

Digital Signatures with PKI

Using Digital Signatures to Sign a Tcl Script.

Step 1: Decide on the Final Tcl Script Contents (Myscript)

Step 2: Generate a Public/Private Key Pair

Step 3: Generate a Certificate with the Key Pair

Step 4: Generate a Detached S/MIME pkcs7 Signature for Myscript Using the Private Key

Step 5: Modify the Format of the Signature to Match the Cisco Style for Signed Tcl Scripts and Append It to the End of Myscript

Tcl Script-Failure Scenario

Scaling Tcl Script Distribution

Appendix A: Cisco IOS Tcl Commands Quick Reference

Index

A

B-C

D

E

F

G-H-I

J-K-L

M

N-O

P

Q-R

S

T

U-V

W

X-Y-Z.

Notes:

Bibliographic Level Mode of Issuance: Monograph

Description based on publisher supplied metadata and other sources.

ISBN:

9786612660214

9781587059520

1587059525

9781282660212

1282660217

9781587059513

1587059517

OCLC:

1024255793