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Cisco Security Appliance Command Line
Configuration Guide
For the Cisco ASA 5500 Series and Cisco PIX 500 Series
Software Version 7.2(2)
Customer Order Number: N/A, Online only
Text Part Number: OL-10088-02
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Cisco Security Appliance Command Line Configuration Guide
Copyright © 2006 Cisco Systems, Inc. All rights reserved.
CCSP, CCVP, the Cisco Square Bridge logo, Follow Me Browsing, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and
iQuick Study are service marks of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, Cisco, the Cisco Certified
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and certain other countries.
All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship
between Cisco and any other company. (0601R)
iii
Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
CONTENTS
About This Guide xxxiii
Document Objectives xxxiii
Audience xxxiii
Related Documentation xxxiv
Document Organization xxxiv
Document Conventions xxxvii
Obtaining Documentation xxxviii
Cisco.com xxxviii
Product Documentation DVD xxxviii
Ordering Documentation xxxviii
Documentation Feedback xxxviii
Cisco Product Security Overview xxxix
Reporting Security Problems in Cisco Products xxxix
Obtaining Technical Assistance xl
Cisco Technical Support & Documentation Website xl
Submitting a Service Request xli
Definitions of Service Request Severity xli
Obtaining Additional Publications and Information xli
CHAPTER
1 Introduction to the Security Appliance 1-1
Firewall Functional Overview 1-1
Security Policy Overview 1-2
Permitting or Denying Traffic with Access Lists 1-2
Applying NAT 1-2
Using AAA for Through Traffic 1-2
Applying HTTP, HTTPS, or FTP Filtering 1-3
Applying Application Inspection 1-3
Sending Traffic to the Advanced Inspection and Prevention Security Services Module 1-3
Sending Traffic to the Content Security and Control Security Services Module 1-3
Applying QoS Policies 1-3
Applying Connection Limits and TCP Normalization 1-3
Firewall Mode Overview 1-3
Stateful Inspection Overview 1-4
VPN Functional Overview 1-5
Contents
iv
Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
Intrusion Prevention Services Functional Overview 1-5
Security Context Overview 1-6
CHAPTER
2 Getting Started 2-1
Getting Started with Your Platform Model 2-1
Factory Default Configurations 2-1
Restoring the Factory Default Configuration 2-2
ASA 5505 Default Configuration 2-2
ASA 5510 and Higher Default Configuration 2-3
PIX 515/515E Default Configuration 2-4
Accessing the Command-Line Interface 2-4
Setting Transparent or Routed Firewall Mode 2-5
Working with the Configuration 2-6
Saving Configuration Changes 2-6
Saving Configuration Changes in Single Context Mode 2-7
Saving Configuration Changes in Multiple Context Mode 2-7
Copying the Startup Configuration to the Running Configuration 2-8
Viewing the Configuration 2-8
Clearing and Removing Configuration Settings 2-9
Creating Text Configuration Files Offline 2-9
CHAPTER
3 Enabling Multiple Context Mode 3-1
Security Context Overview 3-1
Common Uses for Security Contexts 3-1
Unsupported Features 3-2
Context Configuration Files 3-2
Context Configurations 3-2
System Configuration 3-2
Admin Context Configuration 3-2
How the Security Appliance Classifies Packets 3-3
Valid Classifier Criteria 3-3
Invalid Classifier Criteria 3-4
Classification Examples 3-5
Cascading Security Contexts 3-8
Management Access to Security Contexts 3-9
System Administrator Access 3-9
Context Administrator Access 3-10
Enabling or Disabling Multiple Context Mode 3-10
Backing Up the Single Mode Configuration 3-10
Contents
v
Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
Enabling Multiple Context Mode 3-10
Restoring Single Context Mode 3-11
CHAPTER
4 Configuring Switch Ports and VLAN Interfaces for the Cisco ASA 5505 Adaptive Security
Appliance
4-1
Interface Overview 4-1
Understanding ASA 5505 Ports and Interfaces 4-2
Maximum Active VLAN Interfaces for Your License 4-2
Default Interface Configuration 4-3
VLAN MAC Addresses 4-4
Power Over Ethernet 4-4
Monitoring Traffic Using SPAN 4-4
Security Level Overview 4-5
Configuring VLAN Interfaces 4-5
Configuring Switch Ports as Access Ports 4-9
Configuring a Switch Port as a Trunk Port 4-11
Allowing Communication Between VLAN Interfaces on the Same Security Level 4-13
CHAPTER
5 Configuring Ethernet Settings and Subinterfaces 5-1
Configuring and Enabling RJ-45 Interfaces 5-1
Configuring and Enabling Fiber Interfaces 5-2
Configuring and Enabling Subinterfaces 5-3
CHAPTER
6 Adding and Managing Security Contexts 6-1
Configuring Resource Management 6-1
Classes and Class Members Overview 6-1
Resource Limits 6-2
Default Class 6-3
Class Members 6-4
Configuring a Class 6-4
Configuring a Security Context 6-7
Automatically Assigning MAC Addresses to Context Interfaces 6-11
Changing Between Contexts and the System Execution Space 6-11
Managing Security Contexts 6-12
Removing a Security Context 6-12
Changing the Admin Context 6-13
Changing the Security Context URL 6-13
Reloading a Security Context 6-14
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