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Cisco IOS
IP
Configuration Guide
Release 12.2
Corporate Headquarters
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
http://www.cisco.com
Tel: 408 526-4000
800 553-NETS (6387)
Fax: 408 526-4100
Customer Order Number: DOC-7811741=
Text Part Number: 78-11741-02
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THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE I
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CONTENTS About Cisco IOS Software Documentation xxix Documentation Objectives xxix Audience xxix Documentation Organization xxix Documentation Modules xxix Master Indexes xxxii Supporting Documents and Resources xxxii New and Changed Information xxxiii Document Conventions xxxiii Obtaining Documentation xxxv World Wide Web xxxv Documentation CD-ROM xxxv Ordering Documentation xxxv Documentation Feedback xxxv Obtaining Technical Assistance xxxvi Cisco.com xxxvi Technical Assistance Center xxxvi C
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Contents Determining a Routing Process IPC-2 Interior and Exterior Gateway Protocols IPC-2 Interior Gateway Protocols IPC-3 Exterior Gateway Protocols IPC-3 Multiple Routing Protocols IPC-3 IP Multicast IPC-4 IP ADDRESSING AND SERVICES Configuring IP Addressing IPC-7 IP Addressing Task List IPC-7 Assigning IP Addresses to Network Interfaces IPC-7 Assigning Multiple IP Addresses to Network Interfaces IPC-9 Enabling Use of Subnet Zero IPC-9 Disabling Classless Routing Behavior IPC-10 Enabling IP P
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Contents Suppressing Forward and Reverse Record Options IPC-26 Specifying the NHRP Responder Address IPC-26 Changing the Time Period NBMA Addresses Are Advertised as Valid IPC-26 Configuring a GRE Tunnel for Multipoint Operation IPC-27 Configuring NHRP Server-Only Mode IPC-27 Enabling IP Routing IPC-27 Routing Assistance When IP Routing Is Disabled IPC-28 Proxy ARP IPC-28 Default Gateway IPC-28 ICMP Router Discovery Protocol IPC-29 Enabling IP Bridging IPC-30 Enabling Integrated Routing and Brid
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Contents Displaying System and Network Statistics IPC-48 Monitoring and Maintaining NHRP IPC-49 IP Addressing Examples IPC-49 Creating a Network from Separated Subnets Example IPC-50 Serial Interfaces Configuration Example IPC-50 IP Domains Example IPC-51 Dynamic Lookup Example IPC-51 HP Hosts on a Network Segment Example IPC-51 Logical NBMA Example IPC-51 NHRP over ATM Example IPC-53 Changing the Rate for Triggering SVCs Example IPC-55 Applying NHRP Rates to Specific Destinations Example IPC-57
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Contents Configuring the Address Lease Time IPC-71 Configuring Manual Bindings IPC-71 Configuring a DHCP Server Boot File IPC-73 Configuring the Number of Ping Packets IPC-73 Configuring the Timeout Value for Ping Packets IPC-73 Enabling the Cisco IOS DHCP Client on Ethernet Interfaces IPC-73 Configuring DHCP Server Options Import and Autoconfiguration IPC-74 Configuring the Relay Agent Information Option in BOOTREPLY Messages IPC-75 Configuring a Relay Agent Information Reforwarding Policy IPC-
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Contents Applying Time Ranges to Access Lists IPC-97 Including Comments About Entries in Access Lists IPC-98 Applying Access Lists IPC-98 Controlling Access to a Line or Interface IPC-99 Controlling Policy Routing and the Filtering of Routing Information IPC-99 Controlling Dialer Functions IPC-99 Configuring the Hot Standby Router Protocol IPC-100 Enabling HSRP IPC-101 Configuring HSRP Group Attributes IPC-102 Changing the HSRP MAC Refresh Interval IPC-102 Enabling HSRP MIB Traps IPC-103 Enablin
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Contents Enabling CEF IPC-116 Enabling NetFlow Switching IPC-117 Enabling IP Multicast Routing IPC-117 Configuring the Router as a Forwarding Agent IPC-118 Monitoring and Maintaining the IP Network IPC-118 Clearing Caches, Tables, and Databases IPC-118 Monitoring and Maintaining the DRP Server Agent IPC-119 Clearing the Access List Counters IPC-119 Displaying System and Network Statistics IPC-119 Monitoring the MNLB Forwarding Agent IPC-120 Monitoring and Maintaining HSRP Support for ICMP Redire
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Contents Port-Bound Servers IPC-136 Client-Assigned Load Balancing IPC-136 Content Flow Monitor Support IPC-136 Sticky Connections IPC-136 Maximum Connections IPC-136 Delayed Removal of TCP Connection Context IPC-137 TCP Session Reassignment IPC-137 Automatic Server Failure Detection IPC-137 Automatic Unfail IPC-137 Slow Start IPC-137 SynGuard IPC-137 Dynamic Feedback Protocol for IOS SLB IPC-138 Alternate IP Addresses IPC-138 Transparent Web Cache Balancing IPC-138 NAT IPC-138 Redundancy Enhanc
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Contents Verifying Server Failure Detection IPC-149 Troubleshooting IOS SLB IPC-150 Monitoring and Maintaining IOS SLB IPC-151 Configuration Examples IPC-151 IOS SLB Network Configuration Example IPC-152 NAT Configuration Example IPC-153 HSRP Configuration Example IPC-155 IOS SLB Stateless Backup Configuration Example IPC-157 Configuring Mobile IP IPC-159 Mobile IP Overview IPC-159 Why is Mobile IP Needed? IPC-159 Mobile IP Components IPC-160 How Mobile IP Works IPC-161 Agent Discovery IPC-161 R
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Contents Enabling HSRP IPC-171 Configuring HSRP Group Attributes IPC-171 Enabling HA Redundancy for a Physical Network IPC-172 Enabling HA Redundancy for a Virtual Network Using One Physical Network IPC-172 Enabling HA Redundancy for a Virtual Network Using Multiple Physical Networks IPC-173 Enabling HA Redundancy for Multiple Virtual Networks Using One Physical Network IPC-174 Enabling HA Redundancy for Multiple Virtual Networks Using Multiple Physical Networks IPC-174 Verifying HA Redundancy I
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Contents Restrictions to RIP Route Summarization IPC-205 Configuring Route Summarization on an Interface IPC-205 Verifying IP Route Summarization IPC-205 Disabling Automatic Route Summarization IPC-206 Running IGRP and RIP Concurrently IPC-206 Disabling the Validation of Source IP Addresses IPC-207 Enabling or Disabling Split Horizon IPC-207 Configuring Interpacket Delay IPC-208 Connecting RIP to a WAN IPC-208 RIP Configuration Examples IPC-209 Route Summarization Examples IPC-209 Example 1: Cor
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Contents Enabling OSPF IPC-225 Configuring OSPF Interface Parameters IPC-225 Configuring OSPF over Different Physical Networks IPC-226 Configuring Your OSPF Network Type IPC-226 Configuring Point-to-Multipoint, Broadcast Networks IPC-227 Configuring OSPF for Nonbroadcast Networks IPC-227 Configuring OSPF Area Parameters IPC-228 Configuring OSPF NSSA IPC-229 Implementation Considerations IPC-230 Configuring Route Summarization Between OSPF Areas IPC-230 Configuring Route Summarization When Redist
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Contents Basic OSPF Configuration Example for Internal Router, ABR, and ASBRs IPC-246 Complex Internal Router, ABR, and ASBRs Example IPC-246 Complex OSPF Configuration for ABR Examples IPC-249 Route Map Examples IPC-250 Changing OSPF Administrative Distance Example IPC-252 OSPF over On-Demand Routing Example IPC-253 LSA Group Pacing Example IPC-255 Block LSA Flooding Example IPC-255 Ignore MOSPF LSA Packets Example IPC-255 Configuring EIGRP IPC-257 The Cisco EIGRP Implementation IPC-257 EIGRP C
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Contents Configuring Integrated IS-IS IPC-277 IS-IS Configuration Task List IPC-277 Enabling IS-IS and Assigning Areas IPC-277 Enabling IP Routing for an Area on an Interface IPC-279 IS-IS Interface Parameters Configuration Task List IPC-279 Configuring IS-IS Link-State Metrics IPC-280 Setting the Advertised Hello Interval IPC-280 Setting the Advertised CSNP Interval IPC-280 Setting the Retransmission Interval IPC-281 Setting the LSP Transmissions Interval IPC-281 Setting the Retransmission Thro
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Contents How BGP Selects Paths IPC-294 BGP Multipath Support IPC-295 Basic BGP Configuration Task List IPC-295 Advanced BGP Configuration Task List IPC-296 Configuring Basic BGP Features IPC-297 Enabling BGP Routing IPC-297 Configuring BGP Neighbors IPC-297 Managing Routing Policy Changes IPC-298 Resetting a Router Using BGP Dynamic Inbound Soft Reset IPC-299 Resetting a Router Using BGP Outbound Soft Reset IPC-300 Configuring BGP Soft Reset Using Stored Routing Policy Information IPC-300 Verify
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Contents BGP Conditional Advertisement Configuration Task List IPC-315 Conditional Advertisement of a Set of Routes IPC-315 Verifying BGP Conditional Advertisement IPC-315 BGP Conditional Advertisement Troubleshooting Tips IPC-316 Configuring a Routing Domain Confederation IPC-316 Configuring a Route Reflector IPC-317 Configuring BGP Peer Groups IPC-320 Creating the Peer Group IPC-320 Assigning Options to the Peer Group IPC-321 Making Neighbors Members of the Peer Group IPC-324 Disabling a Peer
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Contents Inbound Soft Reset Using Stored Information Example IPC-339 BGP Synchronization Examples IPC-340 BGP Path Filtering by Neighbor Examples IPC-340 BGP Aggregate Route Examples IPC-341 BGP Community with Route Maps Examples IPC-341 BGP Conditional Advertisement Configuration Examples IPC-343 BGP Confederation Examples IPC-344 BGP Peer Group Examples IPC-345 iBGP Peer Group Example IPC-345 eBGP Peer Group Example IPC-345 TCP MD5 Authentication for BGP Examples IPC-346 Configuring Multiproto
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Contents Specifying a Default Network IPC-365 Understanding Gateway of Last Resort IPC-366 Changing the Maximum Number of Paths IPC-366 Configuring Multi-Interface Load Splitting IPC-366 Redistributing Routing Information IPC-367 Understanding Supported Metric Translations IPC-369 Filtering Routing Information IPC-370 Preventing Routing Updates Through an Interface IPC-370 Configuring Default Passive Interfaces IPC-371 Controlling the Advertising of Routes in Routing Updates IPC-372 Controlling
