IPC-256

Configuring OSPF

OSPF Configuration Examples

Cisco IOS IP Configuration Guide

Page 302

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Cisco Systems 78-11741-02 manual IPC-256

Contents

Cisco IOS Configuration Guide Corporate Headquarters Cisco IOS IP Configuration Guide N T E N T S Iii IP Multicast IPC-4 Benefits IPC-35 Configuring the Default Router for the Client Vii Enabling the Cisco IOS Dhcp Client on Ethernet Interfaces Enabling Hsrp IPC-101 Viii Enabling CEF IPC-116 Slow Start IPC-137 Registration IPC-162 Routing Enabling HA Redundancy for a Physical Network IPC-172 Xii Configuring Interpacket Delay Xiii Enabling Ospf IPC-225 Xiv Changing Ospf Administrative Distance Example IPC-252 Configuring Integrated IS-IS Xvi BGP Multipath Support Xvii Indicating Backdoor Routes Xviii BGP Path Filtering by Neighbor Examples IPC-340 Xix Filtering Sources of Routing Information PIM Xxi Restrictions IPC-412 Xxii Xxiii IPC-430 SSM Operations IPC-460 Xxiv Bidirectional Group Tree Building IPC-474 Xxv Enabling PGM Host IPC-495 Xxvi Rgmp Overview Xxvii Xxviii Audience About Cisco IOS Software DocumentationDocumentation Objectives Documentation Organization Shows the Cisco IOS software documentation modules Xxx Xxxi Module DC/DR Module TC/TR Xxxii Master IndexesSupporting Documents and Resources Convention Description New and Changed InformationDocument Conventions Xxxiii Xxxiv World Wide Web Obtaining DocumentationDocumentation Feedback Documentation CD-ROM Cisco.com Contacting TAC by Using the Cisco TAC WebsiteObtaining Technical Assistance Technical Assistance Center Contacting TAC by Telephone Xxxvii Xxxviii Xxxix Using Cisco IOS SoftwareUnderstanding Command Modes Getting Help Mode Access Method Prompt Exit MethodCommand Purpose Xli Example How to Find Command OptionsCommand Comment Xlii Using the no and default Forms of Commands Xliii Building configuration Saving Configuration ChangesFiltering Output from the show and more Commands Xliv Identifying Supported Platforms Using Feature NavigatorUsing Software Release Notes Xlv Xlvi IP Addressing and Services IP Overview Interior and Exterior Gateway Protocols IP Routing ProtocolsDetermining a Routing Process Exterior Gateway Protocols Multiple Routing ProtocolsInterior Gateway Protocols IP Multicast IP Addressing and Services Page Assigning IP Addresses to Network Interfaces Configuring IP AddressingIP Addressing Task List Sets a primary IP address for an interface Routerconfig-if# ip address ip-address maskClass Address or Range Status Assigns multiple IP addresses to network interfaces Assigning Multiple IP Addresses to Network InterfacesEnabling Use of Subnet Zero Disabling Classless Routing Behavior IPC-10 Enabling IP Processing on a Serial Interface IPC-11 Routerconfig-if# ip unnumbered type number Configuring Address Resolution MethodsEstablishing Address Resolution Assigning an explicit IP address to the interface Address in the ARP cache Defining a Static ARP CacheGlobally associates an IP address with a media hardware Were the owner of the specified IP address Enabling Proxy ARP Setting ARP EncapsulationsEnables proxy ARP on the interface IPC-14 IPC-15 Configuring Local-Area MobilityMapping Host Names to IP Addresses IPC-16 Assigning Host Names to IP AddressesSpecifying the Domain Name Enabling the DNS Using the DNS to Discover ISO Clns AddressesSpecifying a Name Server IPC-17 Cisco Implementation of Nhrp Configuring HP Probe Proxy Name RequestsConfiguring the Next Hop Resolution Protocol IPC-18 IPC-19 Destination host IPC-20 Nhrp Configuration Task ListProtocol Operation IPC-21 Statically Configuring a Next Hop ServerEnabling Nhrp on an Interface IPC-22 Configuring Nhrp AuthenticationControlling the Triggering of Nhrp Is attempted Routerconfig-if# ip nhrp use usage-countTriggering Nhrp Based on Traffic Thresholds IPC-23 IPC-24 Controlling the Nhrp Packet Rate IPC-25 IPC-26 Suppressing Forward and Reverse Record OptionsSpecifying the Nhrp Responder Address Enabling IP Routing Configuring a GRE Tunnel for Multipoint OperationConfiguring Nhrp Server-Only Mode IPC-27 Proxy ARP Routing Assistance When IP Routing Is DisabledDefault Gateway IPC-28 Icmp Router Discovery Protocol IPC-29 Enabling Integrated Routing and Bridging Configuring a Routing ProcessEnabling IP Bridging IPC-30 Configuring Broadcast Packet Handling IPC-31 Forwarding UDP Broadcast Packets and Protocols Forwarding UDP broadcast packets, such as BootpRouterconfig-if# ip helper-address address On an interface Establishes a different broadcast address other than Establishing an IP Broadcast AddressFlooding IP Broadcasts Bit Address nethost Speeding Up Flooding of UDP Datagrams IPC-34 Benefits Configuring Network Address TranslationNAT Applications IPC-35 IPC-36 NAT Configuration Task ListNAT Terminology Translating Inside Source Addresses IPC-37 IPC-38 Configuring Static TranslationConfiguring Dynamic Translation with an Access List IPC-39 Configuring Dynamic Translation with a Route MapOverloading an Inside Global Address Defines a standard access list IPC-40 Translating Overlapping Addresses IPC-41 IPC-42 NAT Translating Overlapping Addresses IPC-43 Configuring Dynamic TranslationProviding TCP Load Distribution 1.127 IPC-44 Translations that do not use overloading Changing Translation TimeoutsChanges the timeout value for dynamic address IPC-45 IPC-46 Monitoring and Maintaining NATDeploying NAT Between an IP Phone and Cisco CallManager Specifying the Format of Network Masks Monitoring and Maintaining IP AddressingClearing Caches, Tables, and Databases IPC-47 Displaying System and Network Statistics IPC-48 IPC-49 IP Addressing ExamplesMonitoring and Maintaining Nhrp Router C Configuration Serial Interfaces Configuration ExampleRouter B Configuration Creating a Network from Separated Subnets Example HP Hosts on a Network Segment Example IP Domains ExampleDynamic Lookup Example Logical Nbma Example IPC-52 Two Logical Nbma Networks over One Physical Nbma Network Nhrp over ATM Example IPC-53 Router a Configuration IPC-54 Changing the Rate for Triggering SVCs Example IPC-55 Interface ATM0/0.1 multipoint IPC-56Interface Fddi1/0/0 Ip nhrp network-id Ip nhrp trigger-svc 100 Applying Nhrp Rates to Specific Destinations ExampleIPC-57 Interface Fddi4/0/0 Nhrp on a Multipoint Tunnel Example IPC-58 Flooded Broadcast Example Router D ConfigurationBroadcasting Examples IPC-59 IPC-60 Helper Addresses ExampleFlooding of IP Broadcasts Example Interface serial Following sections show NAT configuration examples NAT Configuration ExamplesFollowing example shows the configuration Dynamic Inside Source Translation Example IPC-62 Overloading Inside Global Addresses ExampleTranslating Overlapping Address Example IPC-63 Ping Command ExampleTCP Load Distribution Example IPC-64 IPC-65 Configuring DhcpDhcp Server Overview IPC-66 Dhcp Request for an IP Address from a Dhcp Server IPC-67 Dhcp Client OverviewDhcp Relay Agent Overview Features Dhcp Configuration Task ListEnabling the Cisco IOS Dhcp Server and Relay Agent Features Routerconfig# service dhcp Database transfers Configuring a Dhcp Address PoolExcluding IP Addresses Dhcp clients IPC-70 Configuring the Dhcp Address Pool Subnet and MaskConfiguring the Domain Name for the Client Configuring the Default Router for the Client Configuring Manual BindingsConfiguring the NetBIOS Node Type for the Client Configuring the Address Lease Time Command IPC-72 Configuring the Timeout Value for Ping Packets Configuring a Dhcp Server Boot FileConfiguring the Number of Ping Packets Enabling the Cisco IOS Dhcp Client on Ethernet Interfaces Import Dhcp option parameters into the Dhcp server database Eight IP addresses in one command lineExits Dhcp pool configuration mode IPC-74 Monitoring and Maintaining the Dhcp Server Configuring a Relay Agent Information Reforwarding PolicyEnabling the Dhcp Smart-Relay Feature IPC-75 Configuration Examples IPC-76 Default-router 172.16.1.100 172.16.1.101 lease Dhcp Database Agent Configuration ExampleDhcp Address Pool Configuration Example Default-router 172.16.2.100 172.16.2.101 lease Cisco IOS Dhcp Client Example Manual Bindings Configuration ExampleOn the Dhcp Server, the configuration is as follows IPC-78 Remote Router Dhcp Server Options Import and Autoconfiguration ExampleCentral Router IPC-79 IPC-80 Managing IP Connections Configuring IP ServicesIP Services Task List IPC-81 Enabling Icmp Redirect Messages Routerconfig-if# ip unreachablesEnabling Icmp Protocol Unreachable Messages Messages Understanding Path MTU Discovery Enables the sending of Icmp mask reply messagesEnabling Icmp Mask Reply Messages IPC-83 Enabling IP Source Routing Setting the MTU Packet SizeRouterconfig-if# ip mtu bytes Sets the IP MTU packet size for an interface Assigns a transmit interface to a receive-only interface Configuring Simplex Ethernet InterfacesConfiguring a DRP Server Agent IPC-85 Limiting the Source of DRP Queries Configuring Authentication of DRP Queries and ResponsesEnabling the DRP Server Agent IPC-86 Filtering IP Packets Using Access Lists IPC-87 Creating Standard and Extended Access Lists Using Numbers IPC-88 IPC-89 IPC-90 Creating Standard and Extended Access Lists Using Names IPC-91 IPC-92 Specifying IP Extended Access Lists with Fragment Control IPC-93 If the Access-List Entry has Then IPC-94 Benefits of Fragment Control in an IP Extended Access List IPC-95 IPC-96 Enabling Turbo Access Control ListsConfiguring Turbo ACLs IPC-97 Applying Time Ranges to Access ListsVerifying Turbo ACLs IPC-98 Including Comments About Entries in Access ListsApplying Access Lists IPC-99 Controlling Access to a Line or InterfaceControlling Dialer Functions Configuring the Hot Standby Router Protocol IPC-100 Enabling Hsrp Enables the HsrpRouterconfig-if# standby group-number ip IPC-101 IPC-102 Configuring Hsrp Group AttributesChanging the Hsrp MAC Refresh Interval IPC-103 Enabling Hsrp MIB TrapsEnabling Hsrp Support for Mpls VPNs IPC-104 Defining VPNsEnabling Hsrp Redirects to Active Hsrp Routers Enabling Hsrp Support for Icmp Redirect MessagesVerifying Hsrp Support for Mpls VPNs IPC-105 IPC-106 Passive Hsrp Router Advertisements Redirects to Passive Hsrp RoutersRedirects to Non-HSRP Routers Redirects Not Sent IPC-108 Configuring IP AccountingConfiguring Hsrp Support for Icmp Redirect Messages Configuring IP MAC Accounting IPC-109 Configures IP accounting based on the precedence Configuring TCP Performance ParametersConfiguring IP Precedence Accounting IPC-110 Compressing TCP Packet Headers Enables TCP header compressionRouterconfig-if# ip tcp Expressing TCP Header Compression Changing the Number of TCP Header Compression Connections Setting the TCP Connection Attempt TimeEnabling TCP Path MTU Discovery Can exist on an interface IPC-113 Enables Path MTU DiscoveryEnabling TCP Selective Acknowledgment Enabling TCP Time Stamp Setting the TCP Maximum Read SizeSetting the TCP Window Size IPC-114 Sets the TCP outgoing queue size Configuring IP over WANsSetting the TCP Outgoing Queue Size IPC-115 IPC-116 Mnlb Forwarding Agent Configuration Task ListEnabling CEF IPC-117 Enabling NetFlow SwitchingEnabling IP Multicast Routing IPC-118 Configuring the Router as a Forwarding AgentMonitoring and Maintaining the IP Network IPC-119 Clearing the Access List CountersMonitoring and Maintaining the DRP Server Agent IPC-120 IP Services Configuration ExamplesMonitoring the Mnlb Forwarding Agent Router 2 Configuration Icmp Services ExampleRouter 1 Configuration Simplex Ethernet Interfaces Example DRP Server Agent Example Numbered Access List ExamplesIp access-group 2 out IPC-122 IPC-123 Turbo Access Control List ExampleImplicit Masks in Access Lists Examples IPC-124 Named Access List ExampleExtended Access List Examples Interface Ethernet0/5 Commented IP Access List Entry Examples IP Extended Access List with Fragment Control ExampleTime Range Applied to an IP Access List Example Interface ethernet Ip access-group strict IPC-126 IP Accounting ExampleHsrp Load Sharing Example Deny tcp 171.69.0.0 0.0.255.255 any eq telnet Hsrp MAC Refresh Interval Examples No Switch or Learning Bridge Present ExampleSwitch or Learning Bridge Present Example IPC-127 Hsrp MIB Trap Example Primary Router ConfigurationBackup Router Configuration Hsrp Support for Mpls VPNs Example Hsrp Support for Icmp Redirect Messages Example Router PE1 ConfigurationRouter PE2 Configuration IPC-129 IPC-130 Forwarding Agent Configuration for FA2 ExampleMnlb Forwarding Agent Examples Services Manager Configuration for SM Example IPC-131 IPC-132 Failover ip address 0.0.0.0 failover Password ciscoNo snmp-server location Casa service-manager port Ip address 172.26.56.19 Configuring Server Load Balancing IPC-133 IOS SLB Functions and Capabilities IPC-134 Algorithms for Server Load Balancing Weighted Round RobinWeighted Least Connections IPC-135 Client-Assigned Load Balancing Content Flow Monitor SupportPort-Bound Servers Sticky Connections Automatic Server Failure Detection Delayed Removal of TCP Connection ContextTCP Session Reassignment Automatic Unfail Transparent Web Cache Balancing Dynamic Feedback Protocol for IOS SLBAlternate IP Addresses IPC-138 IPC-139 Redundancy Enhancement-Stateless BackupRestrictions IOS SLB Configuration Task List IPC-140 IPC-141 Specifying a Server FarmSpecifying a Load-Balancing Algorithm Specifying a Real Server Configuring Real Server AttributesSpecifying a Bind ID IPC-142 Specifying a Virtual Server Enabling the Real Server for ServiceConfiguring Virtual Server Attributes Associating a Virtual Server with a Server Farm Preventing Advertisement of Virtual Server Address Adjusting Virtual Server ValuesEnabling the Virtual Server for Service IPC-144 Implementing IOS SLB Stateless Backup Configuring IOS SLB Dynamic Feedback ProtocolConfiguring NAT How IOS SLB Stateless Backup Works Configuring IOS SLB Stateless Backup IPC-146 IPC-147 Verifying the IOS SLB Stateless Backup ConfigurationCustomizing Group Attributes IPC-148 Verifying IOS SLB InstallationVerifying IOS SLB 10.10.10.1223 IPC-149 Verifying Server Failure DetectionVerify that the the connection counts are increasing IPC-150 Troubleshooting IOS SLBQuestion Answer Monitoring and Maintaining IOS SLB IPC-151 IOS SLB Network Configuration Example IPC-152 NAT Configuration Example IPC-153 IPC-154 Configuration statements for Switch B are as followsConfiguration statements for Switch C are as follows Hsrp Configuration Example IPC-155 IPC-156 Configuration for Device a is as followsConfiguration for Device B is as follows Interface FastEthernet Ip address 2.0.0.1 IOS SLB Stateless Backup Configuration ExampleIPC-157 IPC-158 Mobile IP Overview Configuring Mobile IPWhy is Mobile IP Needed? IPC-159 Mobile IP Components IPC-160 IPC-161 How Mobile IP WorksAgent Discovery IPC-162 RegistrationRouting Mobile IP Security IPC-163 Storing Security Associations IPC-164 Hsrp Groups Home Agent RedundancyStoring SAs on AAA How HA Redundancy Works Prerequisites IPC-166 IPC-167 Mobile IP Configuration Task ListEnabling Home Agent Services IPC-168 Enabling Foreign Agent ServicesConfiguring AAA in the Mobile IP Environment Verifying Setup Configuring Radius in the Mobile IP EnvironmentConfiguring TACACS+ in the Mobile IP Environment IPC-169 Shutting Down Mobile IP Mobile IP HA Redundancy Configuration Task ListMonitoring and Maintaining Mobile IP IPC-170 Enabling Mobile IP IPC-171 Enabling HA Redundancy for a Physical Network IPC-172 IPC-173 Agent are on the same subnet, use the address Defines the virtual networks. Repeat this step forEach virtual network. If the mobile node and home Address option Verifying HA Redundancy IPC-175 Monitoring and Maintaining HA Redundancy Mobile IP Configuration ExamplesHome Agent Configuration Example IPC-176 Home Agent Using AAA Server Example IPC-177 Home Agent Address Configuration Foreign Agent Configuration ExampleMobile IP HA Redundancy Configuration Examples Mobile Node Home Physical Network IPC-179 Networks Repeat this command for each virtualHA Redundancy for Physical Networks Example IPC-180 HA1 Configuration IPC-181 HA2 Configuration IPC-182 Mobile Node and Home Agent on Same Subnet IPC-183 Ip mobile IPC-184Interface loopback0 Ip address 10.0.0.10 Ip mobile home-agent standby SanJoseHANet2 virtual-network IPC-185 IPC-186 IPC-187 Interface ethernet0 Ip address 1.0.0.2 IPC-188 Interface e0 IPC-189 IPC-190 IPC-191 IPC-192 IP Routing Protocols Page Configuring On-Demand Routing IPC-195 IPC-196 On-Demand Routing Configuration Task ListEnabling ODR Filters ODR information on the hub Reconfiguring CDP or ODR TimersFiltering ODR Information Router Using ODR with Dialer Mappings IPC-198 Configuring Routing Information Protocol IPC-199 IPC-200 RIP Configuration Task ListEnabling RIP Applying Offsets to Routing Metrics Allowing Unicast Updates for RIPAdjusting Timers IPC-201 Specifying a RIP Version IPC-202 IPC-203 Enabling RIP AuthenticationRIP Route Summarization IPC-204 Verifying IP Route Summarization Configuring Route Summarization on an InterfaceRestrictions to RIP Route Summarization IPC-205 Disabling Automatic Route Summarization Disables automatic summarizationRunning Igrp and RIP Concurrently IPC-206 Enabling or Disabling Split Horizon Command PurposesDisabling the Validation of Source IP Addresses IPC-207 IPC-208 Configuring Interpacket DelayConnecting RIP to a WAN Route Summarization Examples RIP Configuration ExamplesExample 1 Correct Configuration IPC-209 Split Horizon Examples Example 2 Incorrect ConfigurationTwo examples of configuring split horizon are provided Example Configuration for Router C Configuration for Router aConfiguration for Router B IPC-211 Address Family Timers Example IPC-212 IPC-213 Configuring IgrpCisco Igrp Implementation IPC-214 Igrp Configuration Task ListIgrp Updates IPC-215 Allowing Unicast Updates for IgrpCreating the Igrp Routing Process Controlling Traffic Distribution Routerconfig-router# variance multiplierDefining Unequal-Cost Load Balancing Defines the variance associated with a particular path Routerconfig-router# traffic-share balanced Adjusting the Igrp Metric WeightsAdjusts the Igrp metric Distribute traffic proportionately to the ratios of metrics Validating Source IP Addresses Disabling HolddownEnforcing a Maximum Network Diameter IPC-218 Igrp Configuration Examples IPC-219 Igrp Feasible Successor Relationship Example IPC-220 Router Configuration C Router Configuration aRouter Configuration B IPC-221 IPC-222 IPC-223 Configuring OspfCisco Ospf Implementation Ospf Configuration Task List IPC-224 IPC-225 Configuring Ospf Interface ParametersEnabling Ospf Specifies the authentication type for an interface Configuring Ospf over Different Physical NetworksConfiguring Your Ospf Network Type Network segment IPC-227 Configuring Point-to-Multipoint, Broadcast NetworksConfiguring Ospf for Nonbroadcast Networks IPC-228 Configuring Ospf Area ParametersNonbroadcast media Configuring Ospf Nssa IPC-229 IPC-230 Configuring Route Summarization Between Ospf AreasImplementation Considerations IPC-231 Generating a Default RouteCreating Virtual Links Forcing the Router ID Choice with a Loopback Interface Configuring Lookup of DNS NamesControlling Default Metrics IPC-232 Configuring Route Calculation Timers Changing the Ospf Administrative DistancesConfiguring Ospf on Simplex Ethernet Interfaces IPC-233 Configures Ospf on an on-demand circuit Configuring Ospf over On-Demand CircuitsEnables Ospf operation Routerconfig# interface interface-type Logging Neighbors Going Up or Down Sends syslog message when an Ospf neighbor goes up or downRouterconfig-router# log-adjacency-changes Changing the LSA Group Pacing IPC-236 LSA Group Pacing With Multiple TimersOriginal LSA Behavior Changes the group pacing of LSAs Routerconfig-router# timers lsa-group-pacingBlocking Ospf LSA Flooding IPC-237 Ignoring Mospf LSA Packets Routerconfig-router# ignore lsa mospfReducing LSA Flooding Mospf LSA packets Displaying Ospf Update Packet Pacing IPC-239 Monitoring and Maintaining Ospf IPC-240 IPC-241 Ospf Configuration ExamplesOspf Point-to-Multipoint Example Platty Configuration Mollie ConfigurationNeon Configuration IPC-242 Ospf Point-to-Multipoint, Broadcast Example Jelly ConfigurationRoute information in the first configuration is as follows IPC-243 IPC-244 Ospf Point-to-Multipoint, Nonbroadcast ExampleVariable-Length Subnet Masks Example IPC-245 Basic Ospf Configuration ExamplesOspf Routing and Route Redistribution Examples Complex Internal Router, ABR, and ASBRs Example IPC-246 This configuration, five routers are configured with Ospf IPC-247 IPC-248 Neighbor 11.0.0.6 remote-as Complex Ospf Configuration for ABR ExamplesIPC-249 Route Map Examples Following configuration Ospf is on networkFollowing configuration Igrp autonomous system 200 is on IPC-250 Router bgp Redistribute ospf 109 route-map IPC-251Router rip Redistribute ospf 109 route-map Router isis Changing Ospf Administrative Distance Example IPC-252 Ospf over On-Demand Routing Example IPC-253 IPC-254 Dialer-list 1 protocol ip permit Ignore Mospf LSA Packets Example LSA Group Pacing ExampleBlock LSA Flooding Example IPC-255 IPC-256 IPC-257 Configuring EigrpCisco Eigrp Implementation IPC-258 Enabling Eigrp Eigrp Configuration Task ListEnables an Eigrp routing process in global Associates networks with an Eigrp routing process Making the Transition from Igrp to Eigrp Configuring the Percentage of Link Bandwidth UsedAdjusting the Eigrp Metric Weights Logging Eigrp Neighbor Adjacency Changes Mismatched K Values IPC-261 IPC-262 Disabling Route SummarizationGoodbye Message Value mismatch Configures a summary aggregate address Configuring Summary Aggregate AddressesConfiguring Floating Summary Routes IPC-263 IPC-264 10.1.1.0/24 0.0/0 Router-A Router-B Router-C Enables MD5 authentication in Eigrp packets Configuring Eigrp Route AuthenticationConfigure an interface type and enter interface IPC-265 Configuring Eigrp Protocol-Independent Parameters IPC-266 Disabling Split Horizon Configures the hello interval for an Eigrp routingConfigures the hold time for an Eigrp routing process Process Configuring Eigrp Stub Routing IPC-268 Dual-Homed Remote Topology IPC-269 IPC-270 IPC-271 Monitoring and Maintaining Eigrp Eigrp Stub Routing Configuration Task ListConfiguring Eigrp Stub Routing Verifying Eigrp Stub Routing IPC-273 Eigrp Configuration ExamplesRoute Summarization Example IPC-274 Infinite Route Authentication ExampleIPC-275 Exit Key Key-string Eigrp stub connected static Stub Routing ExampleIPC-276 Enabling IS-IS and Assigning Areas Configuring Integrated IS-ISIS-IS Configuration Task List IPC-277 Routerconfig# router isis area tag IPC-278 IPC-279 IS-IS Interface Parameters Configuration Task ListEnabling IP Routing for an Area on an Interface Setting the Advertised Csnp Interval Configuring IS-IS Link-State MetricsSetting the Advertised Hello Interval IPC-280 Setting the Retransmission Throttle Interval Setting the Retransmission IntervalSetting the LSP Transmissions Interval IPC-281 Specifying Designated Router Election Setting the Hello MultiplierAssigning a Password for an Interface Specifying the Interface Circuit Type Blocking Flooding on Specific Interfaces Configuring Mesh GroupsLimiting LSP Flooding IPC-283 Forces a default route into the IS-IS routing domain Miscellaneous IS-IS Parameters Configuration Task ListGenerating a Default Route Specifying the System Type Summarizing Address Ranges Configuring IS-IS Authentication PasswordsSetting the Overload Bit IPC-285 Changing the Routing Level for an Area Tuning LSP Interval and LifetimeRouterconfig-router# set-overload-bit Sets the overload bit Sets the LSP refresh interval Router Config-router# max-lsp-lifetimePartial Route Computation PRC Router’s database without being refreshed Modifying the Output of show Commands IPC-288 Monitoring IS-IS IS-IS Configuration ExamplesEnabling IS-IS Configuration Example IPC-289 Multiarea IS-IS Configuration for Clns Network Example IPC-290 Router isis BB IS-IS Throttle Timers ExampleIPC-291 IPC-292 IPC-293 Configuring BGPCisco BGP Implementation How BGP Selects Paths IPC-294 IPC-295 Basic BGP Configuration Task ListBGP Multipath Support Advanced BGP Configuration Task List IPC-296 Enabling BGP Routing Configuring Basic BGP FeaturesConfiguring BGP Neighbors IPC-297 Managing Routing Policy Changes Type of Reset Advantages DisadvantagesCapability Policy updates without modification Is memory-intensive IPC-299 Resetting a Router Using BGP Dynamic Inbound Soft ResetKeyword to specify that all connections be reset Resetting a Router Using BGP Outbound Soft Reset IPC-300 Verifying BGP Soft Reset IPC-301 Timer Starts Wakeups Configuring BGP Interactions with IGPsDisables synchronization between BGP and an IGP IPC-302 IPC-303 Configuring BGP WeightsDisabling Autonomous System Path Comparison IPC-304 Configuring BGP Route Filtering by NeighborConfiguring BGP Filtering Using Prefix Lists Argument How the System Filters Traffic by Prefix ListCreating a Prefix List Removes a prefix list with the name specified for list-name IPC-306 Configuring a Prefix List EntryTo the entry Len ge-value = le-value = IPC-307 Deleting a Prefix List or Prefix List EntriesDisplaying Prefix Entries Clearing the Hit Count Table of Prefix List Entries Configuring BGP Path Filtering by NeighborDisabling Next Hop Processing on BGP Updates IPC-308 Configuring BGP Next Hop Propagation Disabling Next Hop Processing Using a Specific AddressDisabling Next Hop Processing Using a Route Map IPC-309 IPC-310 Configuring the BGP VersionConfiguring the MED Metric Resetting eBGP Connections Immediately upon Link Failure Configuring Advanced BGP FeaturesUsing Route Maps to Modify Updates Configuring Aggregate Addresses IPC-312 Configuring BGP Community FilteringDisabling Automatic Summarization of Network Numbers IPC-313 IPC-314 Configuring BGP Conditional AdvertisementSpecifying the Format for the Community Verifying BGP Conditional Advertisement BGP Conditional Advertisement Configuration Task ListConditional Advertisement of a Set of Routes IPC-315 Configures a BGP confederation Configuring a Routing Domain ConfederationBGP Conditional Advertisement Troubleshooting Tips IPC-316 Confederation Configuring a Route ReflectorSpecifies the autonomous systems that belong to IPC-317 IPC-318 Simple BGP Model with a Route Reflector Routerconfig-router# bgp cluster-id cluster-id Configures the local router as a BGP route reflectorConfigures the cluster ID Specified neighbor as a client Creating the Peer Group Configuring BGP Peer GroupsRouterconfig-router# neighbor peer-group-name Creates a BGP peer group Assigning Options to the Peer Group IPC-321 IPC-322 Invokes MD5 authentication on a TCP connection to a BGPConfigures the software to start storing received updates IPC-323 Old BehaviorNew Behavior 000307 %TCP-6-BADAUTH No MD5 digest from 10.0.0.2179 to IPC-324 Disabling a Peer or Peer GroupMaking Neighbors Members of the Peer Group Indicating Backdoor Routes Setting Administrative DistanceAdjusting BGP Timers Modifying Parameters While Updating the IP Routing Table IPC-326 Changing the Default Local Preference ValueRedistributing Network Selecting Path Based on MEDs from Other Autonomous Systems IPC-327 IPC-328 Configuring Route DampeningMinimizing Flapping IPC-329 Understanding Route Dampening TermsEnabling Route Dampening Monitoring and Maintaining BGP Route Dampening Changes the default values of route dampening factorsRouterconfig# bgp dampening half-life reuse IPC-330 Suppressed routes Monitoring and Maintaining BGPClears route dampening information and unsuppresses IPC-331 IPC-332 BGP Configuration ExamplesLogging Changes in Neighbor Status Router bgp Neighbor 1.1.1.1 route-map freddy out BGP Route Map ExamplesIPC-333 Router bgp Redistribute igrp 109 route-map igrp2bgp Access-list 2 permit 0.0.0.0 Set local-preference 25 set metric Set weightSet automatic-tag Ip as-path access-list 1 permit IPC-334 Router bgp Neighbor 1.1.1.1 remote-as IPC-335Router bgp Neighbor 1.1.1.2 remote-as BGP Neighbor Configuration Examples IPC-336 Ip prefix-list abc deny 0.0.0.0/0 BGP Prefix List Filtering ExamplesIPC-337 Ip prefix-list abc permit 35.0.0.0/8 IPC-338 Inbound Soft Reset Using Stored Information Example BGP Soft Reset ExamplesDynamic Inbound Soft Reset Example Added or Deleted Prefix List Entries Examples IPC-340 BGP Synchronization ExamplesBGP Path Filtering by Neighbor Examples IPC-341 BGP Aggregate Route ExamplesBGP Community with Route Maps Examples Ip community-list 3 permit internet IPC-342Route-map bgp Route-map set-community permit 10 set community no-export BGP Conditional Advertisement Configuration ExamplesIPC-343 BGP Confederation Examples IPC-344 EBGP Peer Group Example BGP Peer Group ExamplesIBGP Peer Group Example IPC-345 IPC-346 TCP MD5 Authentication for BGP ExamplesRouter bgp Neighbor 10.108.1.1 password bla4u00=2nkq Configuring Multiprotocol BGP Extensions for IP Multicast IPC-347 IPC-348 Incongruent Unicast and Multicast Routes Multiprotocol BGP Configuration Task List IPC-349 IPC-350 Configuring a Multiprotocol BGP PeerUnderstanding Nlri Keywords and Address Families Configuring a Multiprotocol BGP Peer Group IPC-351 Advertising Routes into Multiprotocol BGP IPC-352 IPC-353 Configuring Route Maps for Multiprotocol BGP PrefixesRedistributing Prefixes into Multiprotocol BGP IPC-354 Configuring Dvmrp Interoperability with Multiprotocol BGPRedistributing Multiprotocol BGP Routes into Dvmrp Redistributed Redistributing Dvmrp Routes into Multiprotocol BGPRedistributes multiprotocol BGP routes into Dvmrp with a Redistributes Dvmrp routes into multiprotocol BGP IPC-356 Configuring a Multiprotocol BGP Route ReflectorConfiguring Aggregate Multiprotocol BGP Addresses Options Verifying Multiprotocol BGP Configuration and OperationConfigures an aggregate address with various IPC-357 IPC-358 Multiprotocol BGP Configuration ExamplesDatabase information IPC-359 Multiprotocol BGP Peer ExamplesMultiprotocol BGP Peer Group Examples Neighbor 10.1.1.1 activate Multiprotocol BGP Route Redistribute Examples Multiprotocol BGP Network Advertisement ExamplesMultiprotocol BGP Route Map Examples IPC-360 IPC-361 Multiprotocol BGP Route Reflector ExamplesAggregate Multiprotocol BGP Address Examples Aggregate-address 172.16.0.0 255.0.0.0 as-set IPC-362 IPC-363 Configuring IP Routing Protocol-Independent FeaturesProtocol-Independent Feature Task List Route Source Default Distance Using Variable-Length Subnet MasksConfiguring Static Routes IPC-364 IPC-365 Specifying Default RoutesSpecifying a Default Network Understanding Gateway of Last Resort Configuring Multi-Interface Load SplittingChanging the Maximum Number of Paths IPC-366 Redistributing Routing Information IPC-367 IPC-368 Understanding Supported Metric Translations IPC-369 Filtering Routing Information Preventing Routing Updates Through an InterfaceSuppresses the sending of routing updates through Specified interface Configuring Default Passive Interfaces IPC-371 Filtering Sources of Routing Information Controlling the Advertising of Routes in Routing UpdatesControlling the Processing of Routing Updates IPC-372 Identifies the route map to use for policy routing Defines a route map to control where packets are outputEnabling Policy Routing PBR IPC-373 IPC-374 IPC-375 Preverifying Next-Hop AvailabilityNumber Name IPC-376 Enabling Fast-Switched Policy RoutingDisplaying Route-Map Policy Information IPC-377 Managing Authentication KeysEnabling Local Policy Routing Clearing Routes from the IP Routing Table IPC-378 Variable-Length Subnet Mask Example Displays authentication key informationDisplays all route maps configured or only the one Specified IPC-380 Administrative Distance ExamplesOverriding Static Routes with Dynamic Protocols Example Ip route 10.0.0.0 255.0.0.0 172.18.3.4 Igrp Redistribution Example Access-list 3 permitStatic Routing Redistribution Example IPC-381 IPC-382 RIP and Igrp Redistribution ExampleEigrp Redistribution Examples Simple Redistribution Example Configuration for router R1 router bgp NetworkRIP and Eigrp Redistribution Examples Complex Redistribution Example IPC-384 Redistribute bgp Internal Router, ABR, and ASBRs Configuration Example IPC-385 IPC-386 Example Ospf Autonomous System Network Map IPC-387 Neighbor 172.16.1.6 remote-as Complex Ospf Configuration ExampleIPC-388 IPC-389 Following configuration, Ospf is on networkFollowing configuration Igrp autonomous system 1 is on Area 10.0.0.0 range 10.0.0.0 IPC-390 Default Metric Values Redistribution ExamplePolicy Routing Route Map Examples IPC-391 Passive-interface ethernet 1 neighbor Passive Interface ExamplesIPC-392 IPC-393 Default Passive Interface ExamplePolicy Routing Example No ip directed-broadcast Interface Serial Ip rip authentication key-chain trees media-type 10BaseT Following example configures a key chain named treesSet default interface null0 Key Management Examples IPC-395 Ip rip receive version 1 no keepalive IPC-396 IP Multicast Page Configuring IP Multicast Routing IPC-399 Cisco IP Multicast Routing Implementation IPC-400 IPC-401 Draft-ietf-pim-v2-dm-03.txt, PIM Version 2 Dense ModeIgmp Versions IPC-402 Basic IP Multicast Routing Configuration Task ListAdvanced IP Multicast Routing Configuration Task List Enabling PIM on an Interface Enabling Dense ModeEnabling IP Multicast Routing IPC-403 Enables PIM dense mode on the interface Enabling Sparse ModeEnabling Sparse-Dense Mode Enables PIM sparse mode on the interface Configuring PIM Dense Mode State Refresh IPC-405 Configures the address of a PIM RP Configuring Auto-RPConfiguring a Rendezvous Point IPC-406 Choosing a Default RP Setting Up Auto-RP in a New InternetworkAdding Auto-RP to an Existing Sparse Mode Cloud Announcing the RP and the Group Range It Serves Starting to Use IP Multicast Filtering Incoming RP Announcement MessagesVerifying the Group-to-RP Mapping Preventing Join Messages to False RPs Controlling Access to IP Multicast Groups Igmp Features Configuration Task ListConfiguring a Router to Be a Member of a Group IPC-409 Selects the Igmp version that the router uses Changing the Igmp VersionRouters That Run Igmp Version Igmp host-query messages IPC-411 Configuring Igmp VersionSets the Igmp query timeout Restrictions IPC-412 Routerconfig-if# ip igmp Changing the Igmp Query TimeoutConfiguring the Router as a Statically Connected Member Changing the Maximum Query Response Time Configures the number of times that the router sends Igmp Configuring Igmp Leave LatencyConfigures the interval at which the router sends Igmp Group-specific or group-source-specific with IGMPv3 query SAP Listener Support Configuration Task List Configuring the TTL ThresholdDisabling Fast Switching of IP Multicast Enabling SAP Listener Support Announcements Routerconfig-if# ip sap listenLimiting How Long a SAP Cache Entry Exists IPC-416 IPC-417 Configuring PIM VersionFunctional address IPC-418 PIM Version 2 Configuration Task ListPrerequisites Defining a PIM Sparse Mode Domain Border Interface Configuring PIM Version 2 OnlyConfiguring PIM Sparse-Dense Mode Specifying the PIM Version IPC-420 Configuring Candidate BSRsConfiguring Candidate RPs Making the Transition to PIM Version Deciding When to Configure a BSRConfigures the router to be a candidate RP IPC-421 Sparse Mode Advanced PIM Features Configuration Task ListDense Mode Monitoring the RP Mapping Information IPC-423 Shared Tree and Source Tree Shortest-Path Tree Shortest-path tree Delaying the Use of PIM Shortest-Path TreeUnderstanding Reverse Path Forwarding IPC-424 Modifying the PIM Router Query Message Interval Assigning an RP to Multicast GroupsIncreasing Control over RPs IPC-425 IPC-426 Understanding the PIM Registering ProcessPIM Version 1 Compatibility Enabling Proxy Registering Configuring the IP Source Address of Register MessagesLimiting the Rate of PIM Register Messages IPC-427 Routerconfig-if# ip pim nbma-mode Enabling PIM Nonbroadcast Multiaccess ModeEnables PIM Nbma mode IPC-428 Configuring an IP Multicast Static Route IPC-429 Controlling the Transmission Rate to a Multicast Group Configuring RTP Header CompressionConfigures an IP multicast static route Controls transmission rate to a multicast group IPC-431 RTP Header Compression IPC-432 Enabling RTP Header Compression on a Serial InterfaceChanging the Number of Header Compression Connections Enabling Express RTP Header Compression IPC-433 IPC-434 IPC-435 IPC-436 Enabling IP Multicast over ATM Point-to-Multipoint VCsLimiting the Number of VCs Keeping VCs from Idling Idling PolicyHow the Idling Policy Works Idled IPC-438 Configuring an IP Multicast BoundaryConfiguring an Intermediate IP Multicast Helper Storing IP Multicast Headers IPC-439 Enables Cgmp Configuring Stub IP Multicast RoutingUse the show ip mpacket Exec command to display the buffer Enabling Cgmp IPC-441 Specified access listMessages to the specified IP address on a central router Equal-cost paths Enabling Native Load SplittingEnabling Load Splitting Across Tunnels IPC-442 IPC-443 Configuring the Access RouterConfiguring the Router at the Opposite End of the Tunnel Configuring Both Routers to RPF IPC-444 Tunnel0 Verifying the Load SplittingIPC-445 Serial1 IPC-446 Using IP Multicast Heartbeat IPC-447 PIM Sparse Mode Example IP Multicast Configuration ExamplesPIM Dense Mode Example IPC-448 PIM Version 2 Examples PIM Dense Mode State Refresh ExampleBSR Configuration Example This section provides examples in the following sections IPC-450 Border Router Configuration ExampleRFC 2362 Interoperable Candidate RP Example Ip pim sparse-dense-mode Router ospf RTP Header Compression Examples IPC-451 No ip route-cache Interface Ethernet2/1 IPC-452No keepalive Clockrate Interface Serial4/0 Version Password lab login No scheduler max-task-time endIPC-453 Ip route-cache IP Multicast over ATM Point-to-Multipoint VC Example IPC-454 IPC-455 Administratively Scoped Boundary ExampleIP Multicast Helper Example Atm pvc 2 0 16 ilmi Stub IP Multicast Example Router A-First Hop Router ConfigurationRouter C-Last Hop Router Configuration IPC-456 IPC-457 IP Multicast Load Splitting Across Equal-Cost Paths Ip address 100.1.3.3 255.255.255.0 bandwidth Clock rate IP Multicast Heartbeat ExampleIPC-458 Ip multicast heartbeat ethernet0 224.1.1.1 1 1 IPC-459 Configuring Source Specific MulticastSSM Components Overview SSM Operations How SSM Differs from Internet Standard MulticastSSM IP Address Range IPC-460 IPC-461 IGMPv3 Host SignallingIgmp v3lite Host Signalling URD Host Signalling IPC-462 Body Retrieved URL string successfully /body Html IPC-463HTTP/1.1 200 OK Benefits Denial of Service Attacks from Unwanted Sources InhibitedEasy to Install and Manage IP Multicast Address Management Not Required Igmp v3lite and URD Require a Cisco IOS Last Hop Router Ideal for Internet Broadcast ApplicationsLegacy Applications Within the SSM Range Restrictions Address Management Restrictions URD Intercept URL Limitations State Maintenance LimitationsIgmp Snooping and Cgmp Limitations Hsil Limitations Monitoring SSM SSM Configuration Task ListConfiguring SSM IPC-467 SSM with Igmp v3lite and URD Example SSM Configuration ExamplesSSM with IGMPv3 Example SSM Filtering Example IPC-469 IPC-470 IPC-471 Configuring Bidirectional PIMBidir-PIM Overview IPC-472 Unidirectional Shared Tree and Source Tree DF Election IPC-473 Packet Forwarding Bidir-PIM Configuration Task ListBidirectional Group Tree Building IPC-474 IPC-475 Configuring Bidir-PIMVerifying Bidirectional Groups IPC-476 Bidir-PIM Configuration ExampleMonitoring and Maintaining Bidir-PIM IPC-477 Configuring Multicast Source Discovery ProtocolHow Msdp Works IPC-478 Msdp Running Between RP Peers Msdp Configuration Task List IPC-479 IPC-480 Configuring an Msdp PeerCaching SA State Controlling Source Information That Your Router Originates Configured, this command provides nothingRequesting Source Information from an Msdp Peer Redistributing Sources Filtering SA Request Messages Using an Msdp FilterControlling Source Information That Your Router Forwards IPC-482 IPC-483 Using TTL to Limit the Multicast Data Sent in SA MessagesControlling Source Information That Your Router Receives Configuring a Default Msdp Peer IPC-484 IPC-485 Configuring an Msdp Mesh GroupShutting Down an Msdp Peer Sparse mode region to send SA messages about active sources Including a Bordering PIM Dense Mode Region in MsdpConfigures the router on the border between a dense mode Dense mode region. The IP address of the interface is used Monitoring and Maintaining Msdp IPC-487 Logical RP Msdp Configuration ExamplesDefault Msdp Peer IPC-488 RouterA Configuration IPC-489 No shutdown Router ospf RouterB ConfigurationIPC-490 No shutdown Interface Loopback10 RouterE ConfigurationIPC-491 Hostname RouterE Ip routing IPC-492 Ip multicast boundary 20 no shutdown Router ospf IPC-493 Configuring PGM Host and Router AssistPGM Overview Network Topology Using PGM Host and Router Assist IPC-494 IPC-495 PGM Host Configuration Task ListEnabling PGM Host Enabling PGM Host with a Physical Interface Verifying PGM Host ConfigurationEnabling PGM Host with a Virtual Host Interface IPC-496 IPC-497 IPC-498 PGM Router Assist Configuration Task ListEnabling PGM Router Assist Enabling PGM Router Assist with a Physical Interface Monitoring and Maintaining PGM HostEnabling PGM Router Assist with a Virtual Host Interface IPC-499 IPC-500 PGM Host and Router Assist Configuration ExamplesMonitoring and Maintaining PGM Router Assist IPC-501 PGM Host with a Virtual Interface ExamplePGM Host with a Physical Interface Example Ip pgm host Interface vif1 IPC-502 PGM Router Assist with a Virtual Interface ExamplePGM Router Assist with a Physical Interface Example Ip pgm router IPC-503 IPC-504 IPC-505 Configuring Unidirectional Link RoutingUdlr Overview Udlr Tunnel IPC-506 Igmp Proxy IPC-507 Prerequisite Udlr Tunnel Configuration Task ListConfiguring Udlr Tunnel IPC-508 IPC-509 Configures Igmp on the interface to be unidirectional Igmp Udlr Configuration Task ListConfiguring the Igmp UDL UDL interface Monitoring Igmp Udlr Igmp Proxy Configuration Task ListChanging the Distance for the Default RPF Interface Displays Udlr information for directly connected multicast IPC-512 Configuring Igmp ProxyVerifying Igmp Proxy This section provides the following Udlr examples Udlr Configuration ExamplesUdlr Tunnel Example IPC-513 IPC-514 Configure tunnel as send-only Udlr tunnelIgmp Udlr Example Ip multicast-routing Serial1 has receive-only capability IPC-515 Uplink Router uplink-rtr ConfigurationDownlink Router downlink-rtr Configuration Igmp Proxy Example IPC-516 IPC-517 Ip igmp unidirectional link IPC-518 Upstream ConfigurationIntegrated Udlr Tunnel, Igmp UDLR, and Igmp Proxy Example Ip multicast-routing Interface Tunnel0 IPC-519 Downstream ConfigurationNo cdp enable Ip pim sparse-mode Ip igmp unidirectional-link IPC-520 IPC-521 Using IP Multicast ToolsMulticast Routing Monitor Overview Restrictions MRM Configuration Task ListConfiguring a Test Sender and Test Receiver IPC-522 Monitoring Multiple Groups IPC-523 IPC-524 Configuring a ManagerConducting an MRM Test IPC-525 Monitoring IP Multicast RoutingMonitoring and Maintaining MRM Test Receiver Configuration MRM Configuration ExampleTest Sender Configuration Manager Configuration IPC-527 ProtocolIP Multicast Routing Overview Rgmp Overview IPC-528 IPC-529 Igmp IPC-530 PIM-SM Rgmp Rgmp Configuration Task List IPC-531 Enables Rgmp on a specified interface Verifying Rgmp ConfigurationRgmp and enters interface configuration mode Enabling Rgmp Monitoring and Maintaining Rgmp IPC-533 Rgmp Configuration Example IPC-534 Switch enable set igmp enable Switch enable set rgmp enable Switch a ConfigurationSwitch B Configuration IPC-535 IPC-536 IPC-537 Configuring Dvmrp InteroperabilityBasic Dvmrp Interoperability Configuration Task List Dvmrp reports Configuring Dvmrp InteroperabilityResponding to mrinfo Requests Injected into Dvmrp Configuring a Dvmrp Tunnel IPC-539 Advertises network 0.0.0.0 to Dvmrp neighbors Advertising Network 0.0.0.0 to Dvmrp NeighborsEnabling Dvmrp Unicast Routing IPC-540 Limiting the Number of Dvmrp Routes Advertised Configuring a Dvmrp Summary AddressEnables Dvmrp unicast routing Changing the Dvmrp Route Threshold Adding a Metric Offset to the Dvmrp Route Disables Dvmrp automatic summarizationDisabling Dvmrp Automatic summarization Specifies a Dvmrp summary address Rejecting a Dvmrp Nonpruning Neighbor IPC-543 IPC-544 Configuring a Delay Between Dvrmp ReportsPrevents peering with nonpruning Dvmrp neighbors Dvmrp Interoperability Example Dvmrp Configuration ExamplesMonitoring and Maintaining Dvmrp Dvmrp Tunnel Example Unnumbered Ethernet Pim Dense-mode Tunnel Source Tunnel Mode dvmrp Interface ethernetIPC-546 Index Page IN-549 IN-550 IN-551 IN-552 IN-553 IN-554 IN-555 IN-556 IN-557 IN-558 IN-559 IN-560 IN-561 IN-562 IN-563 IN-564 IN-565 IN-566 IN-567 IN-568 IN-569 IN-570 IN-571 IN-572 IN-573 IN-574 IN-575 IN-576 IN-577 IN-578