TcL Scripting for Cisco IOS by Durai, Arvind -- Read -- Imperial Library of Trantor

Index

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

Command Substitution Variable Substitution

Lists

lappend lindex linsert llength lsearch lreplace lrange lsort

Procedures

for Command foreach Command while Command

Arrays if Command switch Command Files Summary References

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

Summary References

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

Configuring the IP SLA Sender and Responder Applet and IP SLA Route Failover Example Applet That Monitors the Default Route Applet and Application Failover with a Network Address Translation Example

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

Summary References

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

Modifying the Button and Label for User Input Creating a Tcl Script to Display IP SLA Measurement Results Putting the New Tcl Scripts into Operation Reformatting the IP SLA Output for Readability Automatic Removal and Creation of IP SLA Entries Displaying the Results of the IP SLA Measurement with Auto-Refresh

Tcl Script Refresh Policy SNMP Proxy Event Detector Remote-Procedure Call Requests Multiple-Event Support for Event Correlation Using the clear Command Summary References

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

Configuring the Web Server Writing Code for the MPLS VPN Script Configuring HTML Writing Code for the MPLS CFG Script

Troubleshooting as You Go

Using Tcl to Troubleshoot Network Problems

Monitoring the Console for Events

Creating a Web Application for Remote SNMP Graphing Summary References

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 Summary References

Appendix A. Cisco IOS Tcl Commands Quick Reference Index

← Prev
Back
Next →

← Prev
Back
Next →