Cisco IOS Cookbook 2nd Edition by Kevin Dooley, Ian Brown 0596527225 9780596527228

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ISBN 10: 0596527225 

ISBN 13: 9780596527228

Author: Kevin Dooley, Ian Brown

Never has something cried out for a cookbook quite as much as Cisco’s Internetwork Operating System (IOS). IOS is powerful and flexible, but also confusing and daunting. Most tasks can be accomplished in several different ways. And you don’t want to spend precious time figuring out which way is best when you’re trying to solve a problem quickly.That’s what this cookbook is for. Fortunately, most router configuration tasks can be broken down into several more or less independent steps: you configure an interface, you configure a routing protocol, you set up backup links, you implement packet filters and other access control mechanisms. What you really need is a set of recipes that show you how to perform the most common tasks, so you can quickly come up with a good configuration for your site. And you need to know that these solutions work: you don’t want to find yourself implementing a backup link at 2 A.M. because your main link is down and the backup link you set up when you installed the router wasn’t quite right.Thoroughly revised and expanded, Cisco IOS Cookbook, 2nd Edition, adds sections on MPLS, Security, IPv6, and IP Mobility, and presents solutions to the most common configuration problems, including:Configuring interfaces of many types, from serial to ATM and Frame RelayConfiguring all of the common IP routing protocols (RIP, EIGRP, OSPF, and BGP)Configuring authenticationConfiguring other services, including DHCP and NTPSetting up backup links, and using HSRP to configure backup routersManaging the router, including SNMP and other solutionsUsing access lists to control the traffic through the routerIf you work with Cisco routers, you need a book like this to help you solve problems quickly and effectively. Even if you’re experienced, the solutions and extensive explanations will give you new ideas and insights into router configuration. And if you’re not experienced–if you’ve just been given responsibility for managing a network with Cisco routers–this book could be a job-saver.

Table of contents:

1.0 Introduction

IOS

1.1 Configuring the Router via TFTP

Problem

Solution

Discussion

See Also

1.2 Saving Router Configuration to Server

Problem

Solution

Discussion

See Also

1.3 Booting the Router Using a Remote Configuration File

Problem

Solution

Discussion

See Also

1.4 Storing Configuration Files Larger Than NVRAM

Problem

Solution

Discussion

See Also

1.5 Clearing the Startup Configuration

Problem

Solution

Discussion

See Also

1.6 Loading a New IOS Image

Problem

Solution

Discussion

See Also

1.7 Booting a Different IOS Image

Problem

Solution

Discussion

See Also

1.8 Booting over the Network

Problem

Solution

Discussion

See Also

1.9 Copying an IOS Image to a Server

Problem

Solution

Discussion

See Also

1.10 Copying an IOS Image Through the Console

Problem

Solution

Discussion

1.11 Deleting Files from Flash

Problem

Solution

Discussion

See Also

1.12 Partitioning Flash

Problem

Solution

Discussion

See Also

1.13 Using the Router as a TFTP Server

Problem

Solution

Discussion

See Also

1.14 Using FTP from the Router

Problem

Solution

Discussion

See Also

1.15 Generating Large Numbers of Router Configurations

Problem

Solution

Discussion

See Also

1.16 Changing the Configurations of Many Routers at Once

Problem

Solution

Discussion

See Also

1.17 Extracting Hardware Inventory Information

Problem

Solution

Discussion

See Also

1.18 Backing Up Router Configurations

Problem

Solution

Discussion

See Also

1.19 Warm Reload

Problem

Solution

Discussion

See Also

1.20 Warm Upgrade

Problem

Solution

Discussion

See Also

1.21 Configuration Archiving

Problem

Solution

Discussion

See Also

1.22 Locking Configuration Access

Problem

Solution

Discussion

Router Management

2.0 Introduction

2.1 Creating Command Aliases

Problem

Solution

Discussion

2.2 Managing the Router’s ARP Cache

Problem

Solution

Discussion

2.3 Tuning Router Buffers

Problem

Solution

Discussion

2.4 Auto Tuning Buffers

Problem

Solution

Discussion

See Also

2.5 Using the Cisco Discovery Protocol

Problem

Solution

Discussion

See Also

2.6 Disabling the Cisco Discovery Protocol

Problem

Solution

Discussion

See Also

2.7 Using the Small Servers

Problem

Solution

Discussion

See Also

2.8 Enabling HTTP Access to a Router

Problem

Solution

Discussion

See Also

2.9 Enabling Secure HTTP (HTTPS) Access to a Router

Problem

Solution

Discussion

See Also

2.10 Using Static Hostname Tables

Problem

Solution

Discussion

See Also

2.11 Enabling Domain Name Services

Problem

Solution

Discussion

See Also

2.12 Disabling Domain Name Lookups

Problem

Solution

Discussion

See Also

2.13 Specifying a Router Reload Time

Problem

Solution

Discussion

See Also

2.14 Scheduling of Router Commands

Problem

Solution

Discussion

See Also

2.15 Displaying Historical CPU Values

Problem

Solution

Discussion

2.16 Creating Exception Dump Files

Problem

Solution

Discussion

See Also

2.17 Generating a Report of Interface Information

Problem

Solution

Discussion

See Also

2.18 Generating a Report of Routing Table Information

Problem

Solution

Discussion

See Also

2.19 Generating a Report of ARP Table Information

Problem

Solution

Discussion

See Also

2.20 Generating a Server Host Table File

Problem

Solution

Discussion

See Also

User Access and Privilege Levels

3.0 Introduction

3.1 Setting Up User IDs

Problem

Solution

Discussion

See Also

3.2 Encrypting Passwords

Problem

Solution

Discussion

See Also

3.3 Using Better Password-Encryption Techniques

Problem

Solution

Discussion

See Also

3.4 Removing Passwords from a Router Configuration File

Problem

Solution

Discussion

See Also

3.5 Deciphering Cisco’s Weak Password Encryption

Problem

Solution

Discussion

See Also

3.6 Displaying Active Users

Problem

Solution

Discussion

See Also

3.7 Sending Messages to Other Users

Problem

Solution

Discussion

See Also

3.8 Changing the Number of VTYs

Problem

Solution

Discussion

See Also

3.9 Changing VTY Timeouts

Problem

Solution

Discussion

See Also

3.10 Restricting VTY Access by Protocol

Problem

Solution

Discussion

See Also

3.11 Enabling Absolute Timeouts on VTY Lines

Problem

Solution

Discussion

See Also

3.12 Implementing Banners

Problem

Solution

Discussion

See Also

3.13 Disabling Banners on a Port

Problem

Solution

Discussion

See Also

3.14 Disabling Router Lines

Problem

Solution

Discussion

See Also

3.15 Reserving a VTY Port for Administrative Access

Problem

Solution

Discussion

See Also

3.16 Restricting Inbound Telnet Access

Problem

Solution

Discussion

See Also

3.17 Logging Telnet Access

Problem

Solution

Discussion

See Also

3.18 Setting the Source Address for Telnet

Problem

Solution

Discussion

3.19 Automating the Login Sequence

Problem

Solution

Discussion

See Also

3.20 Using SSH for Secure Access

Problem

Solution

Discussion

See Also

3.21 Changing Privilege Level of IOS Commands

Problem

Solution

Discussion

See Also

3.22 Defining Per User Privileges

Problem

Solution

Discussion

See Also

3.23 Defining Per Port Privileges

Problem

Solution

Discussion

See Also

TACACS+

4.0 Introduction

4.1 Authenticating Login IDs from a Central System

Problem

Solution

Discussion

See Also

4.2 Restricting Command Access

Problem

Solution

Discussion

See Also

4.3 Losing Access to the TACACS+ Server

Problem

Solution

Discussion

See Also

4.4 Disabling TACACS+ Authentication on a Particular Line

Problem

Solution

Discussion

See Also

4.5 Capturing User Keystrokes

Problem

Solution

Discussion

See Also

4.6 Logging System Events

Problem

Solution

Discussion

See Also

4.7 Setting the IP Source Address for TACACS+ Messages

Problem

Solution

Discussion

See Also

4.8 Sample Server Configuration Files

Problem

Solution

Discussion

See Also

IP Routing

5.0 Introduction

Unregistered Addresses

5.1 Finding an IP Route

Problem

Solution

Discussion

5.2 Finding Types of IP Routes

Problem

Solution

Discussion

5.3 Converting Different Mask Formats

Problem

Solution

Discussion

5.4 Using Static Routing

Problem

Solution

Discussion

See Also

5.5 Floating Static Routes

Problem

Solution

Discussion

See Also

5.6 Using Policy-Based Routing to Route Based on Source Address

Problem

Solution

Discussion

See Also

5.7 Using Policy-Based Routing to Route Based on Application Type

Problem

Solution

Discussion

See Also

5.8 Examining Policy-Based Routing

Problem

Solution

Discussion

See Also

5.9 Changing Administrative Distances

Problem

Solution

Discussion

See Also

5.10 Routing Over Multiple Paths with Equal Costs

Problem

Solution

Discussion

See Also

5.11 Static Routes That Track Interfaces or Other Routes

Problem

Solution

Discussion

See Also

5.12 Keeping Statistics on Routing Table Changes

Problem

Solution

Discussion

RIP

6.0 Introduction

6.1 Configuring RIP Version 1

Problem

Solution

Discussion

See Also

6.2 Filtering Routes with RIP

Problem

Solution

Discussion

See Also

6.3 Redistributing Static Routes into RIP

Problem

Solution

Discussion

See Also

6.4 Redistributing Routes Using Route Maps

Problem

Solution

Discussion

See Also

6.5 Creating a Default Route in RIP

Problem

Solution

Discussion

See Also

6.6 Disabling RIP on an Interface

Problem

Solution

Discussion

See Also

6.7 Default Passive Interface

Problem

Solution

Discussion

See Also

6.8 Unicast Updates for RIP

Problem

Solution

Discussion

See Also

6.9 Applying Offsets to Routes

Problem

Solution

Discussion

6.10 Adjusting Timers

Problem

Solution

Discussion

See Also

6.11 Configuring Interpacket Delay

Problem

Solution

Discussion

See Also

6.12 Enabling Nonperiodic Updates

Problem

Solution

Discussion

See Also

6.13 Increasing the RIP Input Queue

Problem

Solution

Discussion

See Also

6.14 Configuring RIP Version 2

Problem

Solution

Discussion

6.15 Enabling RIP Authentication

Problem

Solution

Discussion

See Also

6.16 RIP Route Summarization

Problem

Solution

Discussion

6.17 Route Tagging

Problem

Solution

Discussion

See Also

EIGRP

7.0 Introduction

7.1 Configuring EIGRP

Problem

Solution

Discussion

See Also

7.2 Filtering Routes with EIGRP

Problem

Solution

Discussion

See Also

7.3 Redistributing Routes into EIGRP

Problem

Solution

Discussion

See Also

7.4 Redistributing Routes into EIGRP Using Route Maps

Problem

Solution

Discussion

See Also

7.5 Disabling EIGRP on an Interface

Problem

Solution

Discussion

See Also

7.6 Adjusting EIGRP Metrics

Problem

Solution

Discussion

7.7 Adjusting Timers

Problem

Solution

Discussion

See Also

7.8 Enabling EIGRP Authentication

Problem

Solution

Discussion

See Also

7.9 EIGRP Route Summarization

Problem

Solution

Discussion

See Also

7.10 Logging EIGRP Neighbor State Changes

Problem

Solution

Discussion

See Also

7.11 Limiting EIGRP’s Bandwidth Utilization

Problem

Solution

Discussion

See Also

7.12 EIGRP Stub Routing

Problem

Solution

Discussion

See Also

7.13 Route Tagging

Problem

Solution

Discussion

See Also

7.14 Viewing EIGRP Status

Problem

Solution

Discussion

OSPF

8.0 Introduction

8.1 Configuring OSPF

Problem

Solution

Discussion

8.2 Filtering Routes in OSPF

Problem

Solution

Discussion

See Also

8.3 Adjusting OSPF Costs

Problem

Solution

Discussion

8.4 Creating a Default Route in OSPF

Problem

Solution

Discussion

See Also

8.5 Redistributing Static Routes into OSPF

Problem

Solution

Discussion

8.6 Redistributing External Routes into OSPF

Problem

Solution

Discussion

See Also

8.7 Manipulating DR Selection

Problem

Solution

Discussion

See Also

8.8 Setting the OSPF RID

Problem

Solution

Discussion

See Also

8.9 Enabling OSPF Authentication

Problem

Solution

Discussion

See Also

8.10 Selecting the Appropriate Area Types

Problem

Solution

Discussion

See Also

8.11 Using OSPF on Dial Interfaces

Problem

Solution

Discussion

See Also

8.12 Summarizing Routes in OSPF

Problem

Solution

Discussion

See Also

8.13 Disabling OSPF on Certain Interfaces

Problem

Solution

Discussion

8.14 Changing the Network Type on an Interface

Problem

Solution

Discussion

See Also

8.15 OSPF Route Tagging

Problem

Solution

Discussion

See Also

8.16 Logging OSPF Adjacency Changes

Problem

Solution

Discussion

See Also

8.17 Adjusting OSPF Timers

Problem

Solution

Discussion

See Also

8.18 Reducing OSPF Traffic in Stable Networks

Problem

Solution

Discussion

8.19 OSPF Virtual Links

Problem

Solution

Discussion

8.20 Viewing OSPF Status with Domain Names

Problem

Solution

Discussion

See Also

8.21 Debugging OSPF

Problem

Solution

Discussion

BGP

9.0 Introduction

Basic Terminology

BGP Attributes

Route Selection

9.1 Configuring BGP

Problem

Solution

Discussion

See Also

9.2 Using eBGP Multihop

Problem

Solution

Discussion

See Also

9.3 Adjusting the Next-Hop Attribute

Problem

Solution

Discussion

9.4 Connecting to Two ISPs

Problem

Solution

Discussion

See Also

9.5 Connecting to Two ISPs with Redundant Routers

Problem

Solution

Discussion

See Also

9.6 Restricting Networks Advertised to a BGP Peer

Problem

Solution

Discussion

See Also

9.7 Adjusting Local Preference Values

Problem

Solution

Discussion

See Also

9.8 Load-Balancing

Problem

Solution

Discussion

9.9 Removing Private ASNs from the AS Path

Problem

Solution

Discussion

9.10 Filtering BGP Routes Based on AS Paths

Problem

Solution

Discussion

See Also

9.11 Reducing the Size of the Received Routing Table

Problem

Solution

Discussion

See Also

9.12 Summarizing Outbound Routing Information

Problem

Solution

Discussion

See Also

9.13 Prepending ASNs to the AS Path

Problem

Solution

Discussion

See Also

9.14 Redistributing Routes with BGP

Problem

Solution

Discussion

See Also

9.15 Using Peer Groups

Problem

Solution

Discussion

9.16 Authenticating BGP Peers

Problem

Solution

Discussion

See Also

9.17 Using BGP Communities

Problem

Solution

Discussion

See Also

9.18 Using BGP Route Reflectors

Problem

Solution

Discussion

See Also

9.19 Putting It All Together

Problem

Solution

Discussion

See Also

Frame Relay

10.0 Introduction

Frame Relay QoS Features

10.1 Setting Up Frame Relay with Point-to-Point Subinterfaces

Problem

Solution

Discussion

See Also

10.2 Adjusting LMI Options

Problem

Solution

Discussion

10.3 Setting Up Frame Relay with Map Statements

Problem

Solution

Discussion

See Also

10.4 Using Multipoint Subinterfaces

Problem

Solution

Discussion

See Also

10.5 Configuring Frame Relay SVCs

Problem

Solution

Discussion

See Also

10.6 Simulating a Frame Relay Cloud

Problem

Solution

Discussion

See Also

10.7 Compressing Frame Relay Data on a Subinterface

Problem

Solution

Discussion

See Also

10.8 Compressing Frame Relay Data with Maps

Problem

Solution

Discussion

See Also

10.9 PPP over Frame Relay

Problem

Solution

Discussion

See Also

10.10 Viewing Frame Relay Status Information

Problem

Solution

Discussion

Handling Queuing and Congestion

11.0 Introduction

Queuing Algorithms

Fast Switching and CEF

11.1 Fast Switching and CEF

Problem

Solution

Discussion

See Also

11.2 Setting the DSCP or TOS Field

Problem

Solution

Discussion

See Also

11.3 Using Priority Queuing

Problem

Solution

Discussion

See Also

11.4 Using Custom Queuing

Problem

Solution

Discussion

11.5 Using Custom Queues with Priority Queues

Problem

Solution

Discussion

See Also

11.6 Using Weighted Fair Queuing

Problem

Solution

Discussion

See Also

11.7 Using Class-Based Weighted Fair Queuing

Problem

Solution

Discussion

See Also

11.8 Using NBAR Classification

Problem

Solution

Discussion

11.9 Controlling Congestion with WRED

Problem

Solution

Discussion

See Also

11.10 Using RSVP

Problem

Solution

Discussion

See Also

11.11 Manual RSVP Reservations

Problem

Solution

Discussion

RESV and PATH messages

Two service types

The examples

See Also

11.12 Aggregating RSVP Reservations

Problem

Solution

Discussion

See Also

11.13 Using Generic Traffic Shaping

Problem

Solution

Discussion

See Also

11.14 Using Frame-Relay Traffic Shaping

Problem

Solution

Discussion

See Also

11.15 Using Committed Access Rate

Problem

Solution

Discussion

See Also

11.16 Implementing Standards-Based Per-Hop Behavior

Problem

Solution

Discussion

See Also

11.17 AutoQoS

Problem

Solution

Discussion

See Also

11.18 Viewing Queue Parameters

Problem

Solution

Discussion

Tunnels and VPNs

12.0 Introduction

12.1 Creating a Tunnel

Problem

Solution

Discussion

See Also

12.2 Tunneling Foreign Protocols in IP

Problem

Solution

Discussion

See Also

12.3 Tunneling with Dynamic Routing Protocols

Problem

Solution

Discussion

See Also

12.4 Viewing Tunnel Status

Problem

Solution

Discussion

See Also

12.5 Creating an Encrypted Router-to-Router VPN in a GRE Tunnel

Problem

Solution

Discussion

See Also

12.6 Creating an Encrypted VPN Between the LAN Interfaces of Two Routers

Problem

Solution

Discussion

See Also

12.7 Generating RSA Keys

Problem

Solution

Discussion

See Also

12.8 Creating a Router-to-Router VPN with RSA Keys

Problem

Solution

Discussion

See Also

12.9 Creating a VPN Between a Workstation and a Router

Problem

Solution

Discussion

See Also

12.10 Creating an SSL VPN

Problem

Solution

Discussion

See Also

12.11 Checking IPSec Protocol Status

Problem

Solution

Discussion

Dial Backup

13.0 Introduction

Analog Modems

Switched 56 Kbps Digital Service

ISDN

Estimating How Many Dialup Lines You Need

13.1 Automating Dial Backup

Problem

Solution

Discussion

See Also

13.2 Using Dialer Interfaces

Problem

Solution

Discussion

See Also

13.3 Using an Async Modem on the AUX Port

Problem

Solution

Discussion

See Also

13.4 Using Backup Interfaces

Problem

Solution

Discussion

See Also

13.5 Using Dialer Watch

Problem

Solution

Discussion

See Also

13.6 Using Virtual Templates

Problem

Solution

Discussion

See Also

13.7 Ensuring Proper Disconnection

Problem

Solution

Discussion

13.8 View Dial Backup Status

Problem

Solution

Discussion

See Also

13.9 Debugging Dial Backup

Problem

Solution

Discussion

NTP and Time

14.0 Introduction

14.1 Time-Stamping Router Logs

Problem

Solution

Discussion

See Also

14.2 Setting the Time

Problem

Solution

Discussion

See Also

14.3 Setting the Time Zone

Problem

Solution

Discussion

See Also

14.4 Adjusting for Daylight Saving Time

Problem

Solution

Discussion

See Also

14.5 Synchronizing the Time on All Routers (NTP)

Problem

Solution

Discussion

See Also

14.6 Configuring NTP Redundancy

Problem

Solution

Discussion

See Also

14.7 Setting the Router As the NTP Master for the Network

Problem

Solution

Discussion

See Also

14.8 Changing NTP Synchronization Periods

Problem

Solution

Discussion

See Also

14.9 Using NTP to Send Periodic Broadcast Time Updates

Problem

Solution

Discussion

See Also

14.10 Using NTP to Send Periodic Multicast Time Updates

Problem

Solution

Discussion

See Also

14.11 Enabling and Disabling NTP Per Interface

Problem

Solution

Discussion

See Also

14.12 NTP Authentication

Problem

Solution

Discussion

14.13 Limiting the Number of Peers

Problem

Solution

Discussion

See Also

14.14 Restricting Peers

Problem

Solution

Discussion

See Also

14.15 Setting the Clock Period

Problem

Solution

Discussion

14.16 Checking the NTP Status

Problem

Solution

Discussion

14.17 Debugging NTP

Problem

Solution

Discussion

14.18 NTP Logging

Problem

Solution

Discussion

See Also

14.19 Extended Daylight Saving Time

Problem

Solution

Discussion

See Also

14.20 NTP Server Configuration

Problem

Solution

Discussion

See Also

DLSw

15.0 Introduction

Service Access Points (SAP and LSAP)

Explorers and RIFs

Cisco IOS Code Sets

15.1 Simple Bridging

Problem

Solution

Discussion

15.2 Configuring DLSw

Problem

Solution

Discussion

The peers

Ring groups, ring numbers, and bridge numbers

Explorer options

Other features

15.3 Using DLSw to Bridge Between Ethernet and Token Ring

Problem

Solution

Discussion

Ethernet II or 802.3 framing

See Also

15.4 Converting Ethernet and Token Ring MAC Addresses

Problem

Solution

Discussion

See Also

15.5 Configuring SDLC

Problem

Solution

Discussion

See Also

15.6 Configuring SDLC for Multidrop Connections

Problem

Solution

Discussion

See Also

15.7 Using STUN

Problem

Solution

Discussion

See Also

15.8 Using BSTUN

Problem

Solution

Discussion

15.9 Controlling DLSw Packet Fragmentation

Problem

Solution

Discussion

15.10 Tagging DLSw Packets for QoS

Problem

Solution

Discussion

See Also

15.11 Supporting SNA Priorities

Problem

Solution

Discussion

See Also

15.12 DLSw+ Redundancy and Fault Tolerance

Problem

Solution

Discussion

See Also

15.13 Viewing DLSw Status Information

Problem

Solution

Discussion

15.14 Viewing SDLC Status Information

Problem

Solution

Discussion

See Also

15.15 Debugging DSLw

Problem

Solution

Discussion

See Also

Router Interfaces and Media

16.0 Introduction

16.1 Viewing Interface Status

Problem

Solution

Discussion

See Also

16.2 Configuring Serial Interfaces

Problem

Solution

Discussion

See Also

16.3 Using an Internal T1 CSU/DSU

Problem

Solution

Discussion

See Also

16.4 Using an Internal ISDN PRI Module

Problem

Solution

Discussion

See Also

16.5 Using an Internal 56 Kbps CSU/DSU

Problem

Solution

Discussion

See Also

16.6 Configuring an Async Serial Interface

Problem

Solution

Discussion

See Also

16.7 Configuring ATM Subinterfaces

Problem

Solution

Discussion

See Also

16.8 Setting Payload Scrambling on an ATM Circuit

Problem

Solution

Discussion

See Also

16.9 Classical IP Over ATM

Problem

Solution

Discussion

See Also

16.10 Configuring Ethernet Interface Features

Problem

Solution

Discussion

16.11 Configuring Token Ring Interface Features

Problem

Solution

Discussion

See Also

16.12 Connecting VLAN Trunks with ISL

Problem

Solution

Discussion

See Also

16.13 Connecting VLAN Trunks with 802.1Q

Problem

Solution

Discussion

See Also

16.14 LPD Printer Support

Problem

Solution

Discussion

See Also

Simple Network Management Protocol

17.0 Introduction

SNMP Management Model

MIBs and OIDs

17.1 Configuring SNMP

Problem

Solution

Discussion

See Also

17.2 Extracting Router Information via SNMP Tools

Problem

Solution

Discussion

See Also

17.3 Recording Important Router Information for SNMP Access

Problem

Solution

Discussion

17.4 Using SNMP to Extract Inventory Information from a List of Routers

Problem

Solution

Discussion

See Also

17.5 Using Access Lists to Protect SNMP Access

Problem

Solution

Discussion

See Also

17.6 Logging Unauthorized SNMP Attempts

Problem

Solution

Discussion

See Also

17.7 Limiting MIB Access

Problem

Solution

Discussion

See Also

17.8 Using SNMP to Modify a Router’s Running Configuration

Problem

Solution

Discussion

See Also

17.9 Using SNMP to Copy a New IOS Image

Problem

Solution

Discussion

See Also

17.10 Using SNMP to Perform Mass Configuration Changes

Problem

Solution

Discussion

See Also

17.11 Preventing Unauthorized Configuration Modifications

Problem

Solution

Discussion

See Also

17.12 Making Interface Table Numbers Permanent

Problem

Solution

Discussion

See Also

17.13 Enabling SNMP Traps and Informs

Problem

Solution

Discussion

See Also

17.14 Sending Syslog Messages As SNMP Traps and Informs

Problem

Solution

Discussion

See Also

17.15 Setting SNMP Packet Size

Problem

Solution

Discussion

17.16 Setting SNMP Queue Size

Problem

Solution

Discussion

17.17 Setting SNMP Timeout Values

Problem

Solution

Discussion

17.18 Disabling Link Up/Down Traps per Interface

Problem

Solution

Discussion

See Also

17.19 Setting the IP Source Address for SNMP Traps

Problem

Solution

Discussion

17.20 Using RMON to Send Traps

Problem

Solution

Discussion

See Also

17.21 Enabling SNMPv3

Problem

Solution

Discussion

Using the SNMPv3 security levels

See Also

17.22 Strong SNMPv3 Encryption

Problem

Solution

Discussion

See Also

17.23 Using SAA

Problem

Solution

Discussion

Logging

18.0 Introduction

18.1 Enabling Local Router Logging

Problem

Solution

Discussion

See Also

18.2 Setting the Log Size

Problem

Solution

Discussion

See Also

18.3 Clearing the Router’s Log

Problem

Solution

Discussion

18.4 Sending Log Messages to Your Screen

Problem

Solution

Discussion

18.5 Using a Remote Log Server

Problem

Solution

Discussion

See Also

18.6 Enabling Syslog on a Unix Server

Problem

Solution

Discussion

See Also

18.7 Changing the Default Log Facility

Problem

Solution

Discussion

See Also

18.8 Restricting What Log Messages Are Sent to the Server

Problem

Solution

Discussion

18.9 Setting the IP Source Address for Syslog Messages

Problem

Solution

Discussion

See Also

18.10 Logging Router Syslog Messages in Different Files

Problem

Solution

Discussion

See Also

18.11 Maintaining Syslog Files on the Server

Problem

Solution

Discussion

18.12 Testing the Syslog Sever Configuration

Problem

Solution

Discussion

18.13 Preventing the Most Common Messages from Being Logged

Problem

Solution

Discussion

18.14 Rate-Limiting Syslog Traffic

Problem

Solution

Discussion

18.15 Enabling Error Log Counting

Problem

Solution

Discussion

18.16 XML-Formatted Log Messages

Problem

Solution

Discussion

See Also

18.17 Modifying Log Messages

Problem

Solution

Discussion

See Also

Access-Lists

19.0 Introduction

19.1 Filtering by Source or Destination IP Address

Problem

Solution

Discussion

See Also

19.2 Adding a Comment to an ACL

Problem

Solution

Discussion

See Also

19.3 Filtering by Application

Problem

Solution

Discussion

See Also

19.4 Filtering Based on TCP Header Flags

Problem

Solution

Discussion

See Also

19.5 Restricting TCP Session Direction

Problem

Solution

Discussion

19.6 Filtering Multiport Applications

Problem

Solution

Discussion

See Also

19.7 Filtering Based on DSCP and TOS

Problem

Solution

Discussion

See Also

19.8 Logging When an Access-List Is Used

Problem

Solution

Discussion

See Also

19.9 Logging TCP Sessions

Problem

Solution

Discussion

See Also

19.10 Analyzing ACL Log Entries

Problem

Solution

Discussion

See Also

19.11 Using Named and Reflexive Access-Lists

Problem

Solution

Discussion

See Also

19.12 Dealing with Passive Mode FTP

Problem

Solution

Discussion

See Also

19.13 Using Time-Based Access-Lists

Problem

Solution

Discussion

See Also

19.14 Filtering Based on Noncontiguous Ports

Problem

Solution

Discussion

See Also

19.15 Advanced Access-List Editing

Problem

Solution

Discussion

See Also

19.16 Filtering IPv6

Problem

Solution

Discussion

See Also

DHCP

20.0 Introduction

20.1 Using IP Helper Addresses for DHCP

Problem

Solution

Discussion

See Also

20.2 Limiting the Impact of IP Helper Addresses

Problem

Solution

Discussion

See Also

20.3 Using DHCP to Dynamically Configure Router IP Addresses

Problem

Solution

Discussion

20.4 Dynamically Allocating Client IP Addresses via DHCP

Problem

Solution

Discussion

See Also

20.5 Defining DHCP Configuration Options

Problem

Solution

Discussion

See Also

20.6 Defining DHCP Lease Periods

Problem

Solution

Discussion

See Also

20.7 Allocating Static IP Addresses with DHCP

Problem

Solution

Discussion

See Also

20.8 Configuring a DHCP Database Client

Problem

Solution

Discussion

See Also

20.9 Configuring Multiple DHCP Servers per Subnet

Problem

Solution

Discussion

See Also

20.10 DHCP Static Mapping

Problem

Solution

Discussion

See Also

20.11 DHCP-Secured IP Address Assignment

Problem

Solution

Discussion

20.12 Showing DHCP Status

Problem

Solution

Discussion

See Also

20.13 Debugging DHCP

Problem

Solution

Discussion

NAT

21.0 Introduction

21.1 Configuring Basic NAT Functionality

Problem

Solution

Discussion

21.2 Allocating External Addresses Dynamically

Problem

Solution

Discussion

See Also

21.3 Allocating External Addresses Statically

Problem

Solution

Discussion

See Also

21.4 Translating Some Addresses Statically and Others Dynamically

Problem

Solution

Discussion

See Also

21.5 Using Route Maps to Refine Static Translation Rules

Problem

Solution

Discussion

See Also

21.6 Translating in Both Directions Simultaneously

Problem

Solution

Discussion

See Also

21.7 Rewriting the Network Prefix

Problem

Solution

Discussion

21.8 Using NAT for Server Load Distribution

Problem

Solution

Discussion

21.9 Stateful NAT Failover

Problem

Solution

Discussion

See Also

21.10 Adjusting NAT Timers

Problem

Solution

Discussion

See Also

21.11 Changing TCP Ports for FTP

Problem

Solution

Discussion

21.12 Checking NAT Status

Problem

Solution

Discussion

21.13 Debugging NAT

Problem

Solution

Discussion

First Hop Redundancy Protocols

22.0 Introduction

22.1 Configuring Basic HSRP Functionality

Problem

Solution

Discussion

See Also

22.2 Using HSRP Preempt

Problem

Solution

Discussion

See Also

22.3 Making HSRP React to Problems on Other Interfaces

Problem

Solution

Discussion

See Also

22.4 Load-Balancing with HSRP

Problem

Solution

Discussion

See Also

22.5 Redirecting ICMP with HSRP

Problem

Solution

Discussion

22.6 Manipulating HSRP Timers

Problem

Solution

Discussion

22.7 Using HSRP on Token Ring

Problem

Solution

Discussion

See Also

22.8 HSRP SNMP Support

Problem

Solution

Discussion

See Also

22.9 Increasing HSRP Security

Problem

Solution

Discussion

See Also

22.10 Showing HSRP State Information

Problem

Solution

Discussion

22.11 Debugging HSRP

Problem

Solution

Discussion

22.12 HSRP Version 2

Problem

Solution

Discussion

See Also

22.13 VRRP

Problem

Solution

Discussion

See Also

22.14 Gateway Load-Balancing Protocol

Problem

Solution

Discussion

See Also

IP Multicast

23.0 Introduction

IGMP and CGMP

Multicast Routing Protocols

PIM-DM, PIM-SM, and Bidirectional PIM

DVMRP

MOSPF

MBGP

23.1 Configuring Basic Multicast Functionality with PIM-DM

Problem

Solution

Discussion

23.2 Routing Multicast Traffic with PIM-SM and BSR

Problem

Solution

Discussion

23.3 Routing Multicast Traffic with PIM-SM and Auto RP

Problem

Solution

Discussion

See Also

23.4 Filtering PIM Neighbors

Problem

Solution

Discussion

23.5 Configuring Routing for a Low-Frequency Multicast Application

Problem

Solution

Discussion

See Also

23.6 Multicast over Frame Relay or ATM WANs

Problem

Solution

Discussion

See Also

23.7 Configuring CGMP

Problem

Solution

Discussion

23.8 Using IGMP Version 3

Problem

Solution

Discussion

See Also

23.9 Static Multicast Routes and Group Memberships

Problem

Solution

Discussion

23.10 Routing Multicast Traffic with MOSPF

Problem

Solution

Discussion

23.11 Routing Multicast Traffic with DVMRP

Problem

Solution

Discussion

See Also

23.12 DVMRP Tunnels

Problem

Solution

Discussion

See Also

23.13 Configuring Bidirectional PIM

Problem

Solution

Discussion

See Also

23.14 Controlling Multicast Scope with TTL

Problem

Solution

Discussion

See Also

23.15 Controlling Multicast Scope with Administratively Scoped Addressing

Problem

Solution

Discussion

23.16 Exchanging Multicast Routing Information with MBGP

Problem

Solution

Discussion

See Also

23.17 Using MSDP to Discover External Sources

Problem

Solution

Discussion

See Also

23.18 Configuring Anycast RP

Problem

Solution

Discussion

See Also

23.19 Converting Broadcasts to Multicasts

Problem

Solution

Discussion

See also

23.20 Showing Multicast Status

Problem

Solution

Discussion

23.21 Debugging Multicast Routing

Problem

Solution

Discussion

IP Mobility

24.0 Introduction

Terminology

Local Area Mobility

24.1 Local Area Mobility

Problem

Solution

Discussion

See Also

24.2 Home Agent Configuration

Problem

Solution

Discussion

See Also

24.3 Foreign Agent Configuration

Problem

Solution

Discussion

Authenticating the Foreign Agent

See Also

24.4 Making a Router a Mobile Node

Problem

Solution

Discussion

Authenticating with the Foreign Agent

See Also

24.5 Reverse-Tunnel Forwarding

Problem

Solution

Discussion

See Also

24.6 Using HSRP for Home Agent Redundancy

Problem

Solution

Discussion

See Also

IPv6

25.0 Introduction

IPv6 Addressing

Addressing Standards

IEEE EUI-64 Identifiers

Routing Protocols

25.1 Automatically Generating IPv6 Addresses for an Interface

Problem

Solution

Discussion

See Also

25.2 Manually Configuring IPv6 Addresses on an Interface

Problems

Solution

Discussion

See Also

25.3 Configuring DHCP for IPv6

Problem

Solution

Discussion

See Also

25.4 Dynamic Routing with RIP

Problem

Solution

Discussion

See Also

25.5 Modifying the Default RIP Parameters

Problem

Solution

Discussion

See Also

25.6 IPv6 Route Filtering and Metric Manipulation in RIP

Problem

Solution

Discussion

See Also

25.7 Using OSPF for IPv6

Problem

Solution

Discussion

See Also

25.8 IPv6 Route Filtering and Metric Manipulation in OSPF

Problem

Solution

Discussion

See Also

25.9 Route Redistribution

Problem

Solution

Discussion

See Also

25.10 Dynamic Routing with MBGP

Problem

Solution

Discussion

See Also

25.11 Tunneling IPv6 Through an Existing IPv4 Network

Problem

Solution

Discussion

See Also

25.12 Translating Between IPv6 and IPv4

Problem

Solution

Discussion

See Also

MPLS

26.0 Introduction

Some Terminology

Benefits of MPLS

IOS Versions and Feature Sets

Structure of This Chapter

26.1 Configuring a Basic MPLS P Router

Problem

Solution

Discussion

See Also

26.2 Configuring a Basic MPLS PE Router

Problem

Solution

Discussion

See Also

26.3 Configuring Basic MPLS CE Routers

Problem

Solution

Discussion

See Also

26.4 Configuring MPLS over ATM

Problem

Solution

Discussion

26.5 PE-CE Communication via RIP

Problem

Solution

Discussion

See Also

26.6 PE-CE Communication via OSPF

Problem

Solution

Discussion

See Also

26.7 PE-CE Communication via EIGRP

Problem

Solution

Discussion

See Also

26.8 PE-CE Communication via BGP

Problem

Solution

Discussion

See Also

26.9 QoS over MPLS

Problem

Solution

Discussion

See Also

26.10 MPLS Traffic Engineering with Autoroute

Problem

Solution

Discussion

See Also

26.11 Multicast Over MPLS

Problem

Solution

Discussion

See Also

26.12 Your Service Provider Doesn’t Do What You Want

Problem

Solution

Discussion

See Also

Security

27.0 Introduction

CBAC

PAM

Authentication Proxy

TCP Intercept

Intrusion Prevention

AutoSecure

27.1 Using AutoSecure

Problem

Solution

Discussion

27.2 Using Context-Based Access-Lists

Problem

Solution

Discussion

See Also

27.3 Transparent Cisco IOS Firewall

Problem

Solution

Discussion

See Also

27.4 Stopping Denial of Service Attacks

Problem

Solution

Discussion

27.5 Inspecting Applications on Different Port Numbers

Problem

Solution

Discussion

See Also

27.6 Intrusion Detection and Prevention

Problem

Solution

Discussion

Intrusion detection

Intrusion prevention

See Also

27.7 Login Password Retry Lockout

Problem

Solution

Discussion

See Also

27.8 Authentication Proxy

Problem

Solution

Discussion

See Also

External Software Packages

Perl

Expect

NET-SNMP

PuTTY

OpenSSH

Ethereal

IP Precedence, TOS, and DSCP Classifications

IP Precedence, TOS, and DSCP Classifications

Combining TOS and IP Precedence to Mimic DSCP

RSVP

Queueing Algorithms

Weighted Fair Queueing

Priority Queueing

Custom Queueing

Dropping Packets and Congestion Avoidance

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