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Cisco IOS in a Nutshell 2nd Edition
Cisco routers are everywhere that networks are. They come in
all sizes, from inexpensive units for homes and small
offices to equipment costing well over $100,000 and capable
of routing at gigabit speeds. A fixture in today's networks,
Cisco claims roughly 70% of the router market, producing
high-end switches, hubs, and other
network hardware. One
unifying thread runs through the product line: virtually all
of Cisco's products run the Internetwork Operating System,
or IOS.
If you work with Cisco routers, it's likely that you deal
with Cisco's IOS software--an extremely powerful and complex
operating system, with an equally complex configuration
language. With a cryptic command-line interface and
thousands of commands--some of which mean different things
in different situations--it doesn't have a reputation for
being user-friendly.
Fortunately, there's help. This second edition of Cisco IOS
in a Nutshell consolidates the most important commands and
features of IOS into a single, well-organized volume that
you'll find refreshingly user-friendly.
This handy, two-part reference covers IOS configuration for
the TCP/IP protocol family. The first section includes
chapters on the user interface, configuring lines and
interfaces, access lists, routing protocols, and
dial-on-demand routing and security. A brief, example-filled
tutorial shows you how to accomplish common tasks.
The second part is a classic O'Reilly quick reference to all
the commands for working with TCP/IP and the lower-level
protocols on which it relies. Brief descriptions and lists
of options help you zero in on the commands you for the task
at hand. Updated to cover Cisco IOS Software Major Release
12.3, this second edition includes lots of examples of the
most common configuration steps for the routers themselves.
It's a timely guide that any network administrator will come
to rely on.
Chapter 1
Preface
1. Getting Started
IOS User Modes
Command-Line Completion
Get to Know the Question Mark
Command-Line Editing Keys
Pausing Output
show Commands
2. IOS Images and Configuration Files
IOS Image Filenames
The New Cisco IOS Packaging Model
Loading Image Files Through the Network
Using the IOS Filesystem for Images
The Router's Configuration
Loading Configuration Files
3. Basic Router Configuration
Setting the Router Name
Setting the System Prompt
Configuration Comments
The Enable Password
Mapping Hostnames to IP Addresses
Setting the Router's Time
Enabling SNMP
Cisco Discovery Protocol
System Banners
4. Line Commands
The line Command
The Console Port
Virtual Terminals (VTYs)
Asynchronous Ports (TTYs)
The Auxiliary (AUX) Port
show line
Reverse Telnet
Common Configuration Items
5. Interface Commands
Naming and Numbering Interfaces
Basic Interface Configuration Commands
The Loopback Interface
The Null Interface
Ethernet, Fast Ethernet, and Gigabit Ethernet Interfaces
Token Ring Interfaces
ISDN Interfaces
Serial Interfaces
Asynchronous Interfaces
Interface show Commands
6. Networking Technologies
Frame Relay
ATM
DSL
Cable
VoIP
7. Access Lists
How Packets Match a List Entry
Types of Access Lists
Specific Topics
8. IP Routing Topics
Autonomous System (AS) Numbers
Interior and Exterior Gateway Protocols
Distance-Vector and Link-State Routing Protocols
Static Routes
Split Horizon
Passive Interfaces
Fast Switching and Process Switching
9. Interior Routing Protocols
RIP
IGRP
EIGRP
OSPF
IS-IS
10. Border Gateway Protocol
Introduction to BGP
A Simple BGP Configuration
Route Filtering
An Advanced BGP Configuration
Neighbor Authentication
Peer Groups
Route Reflectors
BGP Confederacies
BGP TTL Security
11. Quality of Service
Marking
Older Queuing Methods
Modern IOS QoS Tools
Congestion Avoidance
Traffic Policing
Traffic Shaping
AutoQoS
QoS Device Manager
12. Dial-on-Demand Routing
Configuring a Simple DDR Connection
Sample Legacy DDR Configurations
Dialer Interfaces (Dialer Profiles)
Multilink PPP
Snapshot DDR
13. Specialized Networking Topics
Bridging
Hot Standby Routing Protocol (HSRP)
Network Address Translation (NAT)
Tunnels
Encrypted Tunnels
Multicast Routing
Multiprotocol Label Switching (MPLS)
14. Switches and VLANs
Switch Terminology
IOS on Switches
Basic Switch Configuration
Trunking
Switch Monitor Port for IDS or Sniffers
Troubleshooting Switches
15. Router Security
Securing Enable Mode Access
Routine Security Measures
Restricting Access to Your Router
16. Troubleshooting and Logging
ping
trace
Debugging
Logging
17. Quick Reference
Appendix.
Index
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