book

Cisco OSPF Command and Configuration Handbook

Name: Cisco OSPF Command and Configuration Handbook
Author: Ph.D. - CCIE #2969 William R. Parkhurst
ISBN: 9781587050718

by Ph.D. - CCIE #2969 William R. Parkhurst

April 2002

Intermediate to advanced

528 pages

9h 26m

English

Cisco Press

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Copyright
Dedications
About the Author
About the Technical Reviewers
Acknowledgments
Introduction
Recommended ReadingIcons Used in This BookCommand Syntax Conventions
1. OSPF Process Configuration Commands
1-1. router ospf process-idConfiguration Example: Enabling an OSPF ProcessVerificationTroubleshooting1-2. router ospf process-id vrf name
2. OSPF Area Commands
2-1. area area-id authenticationConfiguration Example: Simple Password AuthenticationVerificationTroubleshooting2-2. area area-id authentication message-digestConfiguration Example 1: MD5 Password AuthenticationVerificationConfiguration Example 2: Changing Keys and PasswordsTroubleshooting2-3. area area-id default-cost costConfiguration Example: Setting the Default Cost for a Stub AreaVerificationTroubleshooting2-4. area area-id nssaConfiguration Example: Configuring an OSPF NSSAVerificationTroubleshooting2-5. area area-id nssa default-information-originateConfiguration Example: Advertising an OSPF NSSA Default Route into an OSPF NSSAVerificationTroubleshooting2-6. area area-id nssa no-redistributionConfiguration Example: Preventing Redistributed Routes from Entering an OSPF NSSAVerificationTroubleshooting2-7. area area-id nssa no-summaryConfiguration Example: Creating a Totally Stubby NSSAVerificationTroubleshooting2-8. area area-id range ip-address mask2-9. area area-id range ip-address mask advertise2-10. area area-id range ip-address mask not-advertiseConfiguration Example 1: Summarizing OSPF Routes from a Non-zero OSPF Area into the BackboneVerificationConfiguration Example 2: Summarizing OSPF Routes from Area 0 into a Non-zero OSPF AreaVerificationConfiguration Example 3: Using a Static Route to Null 0 for the Summary AddressTroubleshooting2-11. area area-id stubConfiguration Example: Configuring an OSPF Stub AreaVerificationTroubleshooting2-12. area area-id stub no-summaryConfiguration Example: Configuring an OSPF Totally Stubby AreaVerificationTroubleshooting2-13. area transit-area-id virtual-link router-idConfiguration Example: Creating an OSPF Virtual LinkVerificationTroubleshooting2-14. area transit-area-id virtual-link router-id authentication authentication-key password2-15. area transit-area-id virtual-link router-id authentication message-digest2-16. area transit-area-id virtual-link router-id authentication nullConfiguration Example 1: Simple Password Authentication Over a Virtual LinkVerificationConfiguration Example 2: MD5 Authentication Over a Virtual LinkVerificationConfiguration Example 3: Changing Keys and PasswordsVerificationConfiguration Example 4: Null AuthenticationVerificationTroubleshooting2-17. area transit-area-id virtual-link router-id authentication-key passwordConfiguration Example 1: Simple Password Authentication Over a Virtual LinkVerificationTroubleshooting2-18. area transit-area-id virtual-link router-id dead-interval secondsConfiguration Example: Modifying the Dead Interval Over a Virtual LinkVerificationTroubleshooting2-19. area transit-area-id virtual-link router-id hello-interval secondsConfiguration Example: Modifying the Hello Interval Over a Virtual LinkVerificationTroubleshooting2-20. area transit-area-id virtual-link router-id message-digest-key key-id md5 passwordConfiguration Example 1: Message Digest Authentication Over a Virtual LinkVerificationConfiguration Example 2: Changing Keys and PasswordsVerificationTroubleshooting2-21. area transit-area-id virtual-link router-id retransmit-interval secondsConfiguration Example: Modifying the Retransmit Interval Over a Virtual LinkVerificationVerificationTroubleshooting2-22. area transit-area-id virtual-link router-id transmit-delay secondsConfiguration Example: Modifying the Transmit Delay Value for a Virtual LinkVerificationTroubleshooting
3. Auto Cost
3-1. auto-cost reference-bandwidth bandwidthConfiguration Example: Globally Modifying OSPF Interface CostsVerificationTroubleshooting
4. Default Route Generation
4-1. default-information originateConfiguration Example: Advertising a Default Route into the OSPF DomainVerificationTroubleshooting:4-2. default-information originate alwaysConfiguration Example: Unconditionally Advertising a Default Route into the OSPF DomainVerificationTroubleshooting4-3. default-information originate metric cost4-4. default-information originate always metric costConfiguration Example: Unconditionally Advertising a Default Route into the OSPF DomainVerificationTroubleshooting4-5. default-information originate metric-type type4-6. default-information originate always metric-type typeConfiguration Example: Setting the OSPF Metric Type for a Default RouteVerificationTroubleshooting4-7. default-information originate route-map route-map-nameConfiguration Example: Using a Route Map for Conditional Default Route AdvertisementVerificationTroubleshooting
5. Setting the Default Metric for Redistributed Protocols
5-1. default-metric costConfiguration Example: Setting the Default Cost for Redistributed RoutesVerificationTroubleshooting
6. Administrative Distance
6-1. distance administrative-distanceConfiguration Example: Adjusting the Administrative Distance to Influence Route SelectionVerificationTroubleshooting6-2. distance administrative-distance source-ip-address source-ip-mask6-3. distance administrative-distance source-ip-address source-ip-mask access-list-numberConfiguration Example 1: Adjusting the Administrative Distance of All Routes Learned from a Particular OSPF NeighborVerificationConfiguration Example 2: Adjusting the Administrative Distance of Selected Routes Learned from a Particular OSPF NeighborVerificationTroubleshooting6-4. distance ospf external administrative-distance6-5. distance ospf inter-area administrative-distance6-6. distance ospf intra-area administrative-distanceConfiguration Example: Adjusting the Administrative Distance Based on the Type of OSPF RouteVerificationTroubleshooting

7. Filtering Routes with Distribute Lists
7-1. distribute-list access-list-number inConfiguration Example: Preventing OSPF Learned Routes from Being Installed in the IP Routing TableVerificationTroubleshooting7-2. distribute-list access-list-number in interface-type interface-numberConfiguration Example: Preventing Routes Learned via OSPF Over a Specific Interface from Being Installed in the IP Routing TableVerificationTroubleshooting7-3. distribute-list access-list-number out7-4. distribute-list access-list-number out interface-type interface-number7-5. distribute-list access-list-number out routing-processConfiguration Example: Preventing Routes Redistributed into OSPF from Being Installed in the IP Routing TableVerificationTroubleshooting7-6. distribute-list access-list-name inConfiguration Example: Preventing OSPF Learned Routes from Being Installed in the IP Routing TableVerificationTroubleshooting7-7. distribute-list access-list-name in interface-type interface-numberConfiguration Example: Preventing Routes Learned via OSPF Over a Specific Interface from Being Installed in the IP Routing TableVerificationTroubleshooting7-8. distribute-list access-list-name out7-9. distribute-list access-list-name out interface-type interface-number7-10. distribute-list access-list-name out routing-processConfiguration Example: Preventing Routes Redistributed into OSPF from Being Installed in the OSPF DatabaseVerificationTroubleshooting7-11. distribute-list prefix prefix-list-name inConfiguration Example: Preventing OSPF Learned Routes from Being Installed in the IP Routing TableVerificationTroubleshooting7-12. distribute-list prefix prefix-list-name in interface-type interface-numberConfiguration Example: Preventing Routes Learned via OSPF Over a Specific Interface from Being Installed in the IP Routing TableVerificationTroubleshooting7-13. distribute-list prefix prefix-list-name out7-14. distribute-list prefix prefix-list-name out interface-type interface-number7-15. distribute-list prefix prefix-list-name out routing-processConfiguration Example: Preventing Routes Redistributed into OSPF from Being Installed in the OSPF DatabaseVerificationTroubleshooting
8. Handling of MOSPF LSAs
8-1. ignore lsa mospf
9. Logging OSPF Neighbor Changes
9-1. log-adjacency-changes9-2. log adjacency-changes detailConfiguration Example 1: Enabling OSPF Neighbor Status-Change Logging to the ConsoleVerificationConfiguration Example 2: Enabling OSPF Neighbor Status-Change Logging to MemoryVerificationTroubleshooting
10. Multiple Path Configuration
10-1. maximum-paths number-of-pathsConfiguration Example: Setting the Maximum Number of Equal-Cost Paths That OSPF Will Install in the IP Routing TableVerificationTroubleshooting
11. OSPF neighbor Commands
11-1. neighbor ip-addressConfiguration Example 1: Using the neighbor Command to Enable OSPF on an NBMAVerificationConfiguration Example 2: Configuring OSPF Neighbors on a Hub and Spoke Topology with the Neighbors on the Same IP SubnetVerificationConfiguration Example 3: Configuring OSPF Neighbors on a Hub and Spoke Topology with the Neighbors on Different IP SubnetsVerificationTroubleshooting11-2. neighbor ip-address cost costConfiguration Example: Modifying the Cost of an OSPF Neighbor on a Point-to-Multipoint InterfaceVerificationTroubleshooting11-3. neighbor ip-address database-filter all outConfiguration Example: Reducing the Flooding of LSAs on a Redundant OSPF LinkVerificationTroubleshooting11-4. neighbor ip-address poll-interval intervalConfiguration Example: Setting the Poll Interval on an NBMA NetworkVerificationTroubleshooting11-5. neighbor ip-address priority priorityConfiguration Example: Setting the Priority of an OSPF NeighborVerificationTroubleshooting
12. OSPF network Command
12-1. network ip-address wild-card-mask area area-idConfiguration Example 1: Using a Host Address to Enable OSPF on an InterfaceVerificationConfiguration Example 2: Using the Same Network/Mask Pair in the OSPF network Statement That Is Used for the InterfaceVerificationConfiguration Example 3: Using a Shorter Mask to Enable OSPF on Multiple InterfacesTroubleshooting
13. Passive OSPF Interfaces
13-1. passive-interface interface-name interface-numberConfiguration Example: Using a Passive Interface to Reduce Protocol TrafficVerificationTroubleshooting13-2. passive-interface defaultConfiguration Example: Many Interfaces, Few NeighborsVerificationTroubleshooting
14. Route Redistribution
14-1. redistribute routing-process process-id14-2. redistribute routing-process process-id metric ospf-metric14-3. redistribute routing-process process-id metric-type metric-type14-4. redistribute routing-process process-id subnets14-5. redistribute routing-process process-id tag tag-valueConfiguration Example: 1 Redistributing Classful Routes into OSPF with the Default Type and MetricVerificationConfiguration Example: 2 Redistributing Classful Routes into OSPF with the Default Type and Specific MetricVerificationConfiguration Example: 3 Redistributing Classful Routes into OSPF as Type 1 Routes Using a Specific MetricVerificationConfiguration Example: 4 Redistributing Subnet Routes into OSPF as Type 1 Routes Using a Specific MetricVerificationConfiguration Example: 5 Redistributing Subnet Routes into OSPF as Type 1 Routes Using a Specific Metric and Route TagVerificationTroubleshooting14-6. redistribute routing-process process-id route-map route-map-nameConfiguration Example: 1 Controlling the Routes to Be Redistributed Based on IP AddressVerificationConfiguration Example: 2 Modifying the Metric of Redistributed Routes Using a Route MapVerificationConfiguration Example: 3 Modifying the Metric Type of Redistributed Routes Using a Route MapVerificationConfiguration Example: 4 Modifying the Tag Value of Redistributed Routes Using a Route MapVerificationConfiguration Example: 5 Controlling Route Redistribution Based on Tag ValuesVerificationTroubleshooting
15. Controlling the OSPF Router ID
15-1. router-id ip-addressConfiguration Example: OSPF Router ID SelectionVerificationTroubleshooting
16. Summarizing External Routes
16-1. summary-address ip-address mask16-2. summary-address ip-address mask not-advertiseConfiguration Example 1: Summarizing Routes Redistributed into OSPFVerificationTroubleshooting16-3. summary-address ip-address mask tag valueConfiguration Example 1: Attaching a Tag to Summarized Routes Created on an ASBRVerificationConfiguration Example 2: Using the Tag Value to Control Route RedistributionVerificationTroubleshooting
17. OSPF Timers
17-1. timers lsa-group-pacing secondsConfiguration Example: Modifying the LSA Group PacingVerification17-2. timers spf delay intervalConfiguration Example: Modifying the LSA Group PacingVerification
18. Traffic Sharing
18-1. traffic-share min across-interfaces
19. Interface Configuration Commands
19-1. ip ospf authentication19-2. ip ospf authentication authentication-key password19-3. ip ospf authentication message-digest19-4. ip ospf authentication nullConfiguration Example 1: Simple Password Authentication on an OSPF NetworkVerificationConfiguration Example 2: MD5 Authentication on an OSPF NetworkVerificationConfiguration Example 3: Changing Keys and PasswordsVerificationConfiguration Example 4: Null AuthenticationVerificationTroubleshooting19-5. ip ospf cost costConfiguration Example: Modifying the OSPF Cost of an InterfaceVerificationTroubleshooting19-6. ip ospf database-filter all outConfiguration Example: Reducing the Flooding of LSAs on a Redundant OSPF LinkVerificationTroubleshooting19-7. ip ospf dead-interval secondsConfiguration Example: Modifying the Interface Dead IntervalVerificationTroubleshooting19-8. ip ospf demand-circuitConfiguration Example: Configuring a Point-to-Point Link as an OSPF Demand CircuitVerificationTroubleshooting19-9. ip ospf flood-reductionConfiguration Example: Configuring OSPF Flood Reduction on an InterfaceVerificationTroubleshooting19-10. ip ospf hello-interval secondsConfiguration Example: Modifying the Interface Hello IntervalVerificationTroubleshooting19-11. ip ospf message-digest-key key-id md5 passwordConfiguration Example 1: Message Digest Authentication on an OSPF InterfaceVerificationConfiguration Example 2: Changing Keys and PasswordsVerificationTroubleshooting19-12. ip ospf mtu-ignoreConfiguration Example: OSPF Adjacency and MTU MismatchVerificationTroubleshooting19-13. ip ospf network broadcastConfiguration Example 1: Fully-meshed OSPF Neighbors on an NBMA NetworkVerificationConfiguration Example 2: Partially-meshed OSPF Neighbors on an NBMA NetworkVerificationTroubleshooting19-14. ip ospf network non-broadcast19-15. ip ospf network point-to-multipoint19-16. ip ospf network point-to-multipoint non-broadcastConfiguration Example 1: Multipoint Hub with Point-to-Point SpokesVerificationConfiguration Example 2: Partially Meshed Hub and Spoke Using a Multipoint NetworkVerificationTroubleshooting19-17. ip ospf network point-to-pointConfiguration Example: Point-to-Point Partially Meshed OSPF NeighborsVerificationTroubleshooting19-18. ip ospf priority priorityConfiguration Example: Influencing the Election of the Designated RouterVerificationTroubleshooting19-19. ip ospf retransmit-interval secondsConfiguration Example: Modifying the Retransmit IntervalVerificationTroubleshooting19-20. ip ospf transmit-delay secondsConfiguration Example: Modifying the Transmit Delay Value for an OSPF InterfaceVerificationTroubleshooting
20. show Commands
20-1. show ip ospf20-2. show ip ospf process-idExample: Displaying OSPF Process Information20-3. show ip ospf border-routers20-4. show ip ospf process-id border-routersExample: Displaying OSPF Border Router Information20-5. show ip ospf database20-6. show ip ospf process-id database20-7. show ip ospf database adv-router router-id20-8. show ip ospf process-id database adv-router router-id20-9. show ip ospf database asbr-summary20-10. show ip ospf process-id database asbr-summary20-11. show ip ospf database asbr-summary asbr-id20-12. show ip ospf process-id database asbr-summary asbr-id20-13. show ip ospf database database-summary20-14. show ip ospf process-id database database-summary20-15. show ip ospf database external20-16. show ip ospf process-id database external20-17. show ip ospf database network20-18. show ip ospf process-id database network20-19. show ip ospf database nssa-external20-20. show ip ospf process-id database nssa-external20-21. show ip ospf database router20-22. show ip ospf process-id database router20-23. show ip ospf database self-originate20-24. show ip ospf process-id database self-originate20-25. show ip ospf database summary20-26. show ip ospf process-id database summaryExample 1: Displaying OSPF Database Information from a Specific OSPF RouterExample 2: Displaying OSPF Database Information from an OSPF ASBR Router20-27. show ip ospf flood-list20-28. show ip ospf process-id flood-list20-29. show ip ospf flood-list int-name int-number20-30. show ip ospf process-id flood-list int-name int-numberExample: Displaying All OSPF Floodlist Information20-31. show ip ospf interface20-32. show ip ospf process-id interface20-33. show ip ospf interface int-name int-number20-34. show ip ospf process-id interface int-name int-numberExample 1: Displaying Information for an OSPF-Enabled InterfaceExample 2: Displaying OSPF Timer Information for an OSPF-enabled Interface20-35. show ip ospf neighbor20-36. show ip ospf process-id neighbor20-37. show ip ospf neighbor neighbor-id20-38. show ip ospf process-id neighbor neighbor-id20-39. show ip ospf neighbor int-name int-number20-40. show ip ospf process-id neighbor int-name int-number20-41. show ip ospf neighbor detail20-42. show ip ospf process-id neighbor detail20-43. show ip ospf neighbor detail neighbor-id20-44. show ip ospf process-id neighbor detail neighbor-id20-45. show ip ospf neighbor int-name int-number20-46. show ip ospf process-id neighbor int-name int-numberExample 1: Displaying Information for All OSPF NeighborsExample 2: Displaying Detailed Information for a Specific OSPF Neighbor20-47. show ip ospf request-list20-48. show ip ospf process-id request-list20-49. show ip ospf request-list neighbor-id20-50. show ip ospf process-id request-list neighbor-id20-51. show ip ospf request-list int-name int-number20-52. show ip ospf process-id request-list int-name int-numberExample: Displaying Request List Information for a Particular OSPF Neighbor20-53. show ip ospf retransmission-list20-54. show ip ospf process-id retransmission-list20-55. show ip ospf retransmission neighbor-id20-56. show ip ospf process-id retransmission neighbor-id20-57. show ip ospf retransmission int-name int-number20-58. show ip ospf process-id retransmission int-name int-numberExample: Displaying the List of LSAs Waiting to Be Re-sent on a Particular Interface20-59. show ip ospf summary-address20-60. show ip ospf process-id summary-addressExample: Displaying the List of Summary Addresses Configured on a Router20-61. show ip ospf virtual-links20-62. show ip ospf process-id virtual-linksExample: Displaying the Status of All Virtual Links Configured on the Local Router
21. debug Commands
21-1. debug ip ospf adjExample 1: Displaying the Successful Formation of an OSPF AdjacencyExample 2: Displaying the Attempted Formation of an OSPF Adjacency when There Is an Area Mismatch21-2. debug ip ospf eventsExample 1: Displaying the Successful Formation of an OSPF AdjacencyExample 2: Debugging an OSPF Adjacency Problem21-3. debug ip ospf flood21-4. debug ip ospf flood ip-access-list-numberExample 1: Displaying All Output from the OSPF Flooding ProtocolExample 2: Selective Display of OSPF Protocol Debugging Output21-5. debug ip ospf lsa-generation21-6. debug ip ospf lsa-generation ip-access-list-numberExample: Displaying the Successful Formation of an OSPF Adjacency21-7. debug ip ospf packetExample: Displaying OSPF Packet Information21-8. debug ip ospf retransmission21-9. debug ip ospf spf21-10. debug ip ospf spf external21-11. debug ip ospf spf external access-list-number21-12. debug ip ospf spf inter21-13. debug ip ospf spf inter access-list-number21-14. debug ip ospf spf intra21-15. debug ip ospf spf intra access-list-numberExample: Displaying SPF Output for External OSPF Routes
22. clear Commands
22-1. clear ip ospf counters22-2. clear ip ospf process-id counters22-3. clear ip ospf process-id counters neighbor22-4. clear ip ospf process-id counters neighbor int-name int-numberExample: Viewing and Clearing OSPF Neighbor State Transition Counters22-5. clear ip ospf process22-6. clear ip ospf process-id process22-7. clear ip ospf redistribution22-8. clear ip ospf process-id redistribition

Content preview from Cisco OSPF Command and Configuration Handbook

Chapter 4. Default Route Generation

default-information originate

Syntax Description:

This form of the command has no arguments.

Purpose: To enable OSPF to advertise the default route 0.0.0.0 into the OSPF domain. This form of the command will only advertise the default route if the route exists in the local IP routing table.

Initial Cisco IOS Software Release: 10.0

Configuration Example: Advertising a Default Route into the OSPF Domain

Configure the routers in Figure 4-1 as shown in the following code.

Figure 4-1. When OSPF Advertises a Default Route the Advertising Router Becomes an Autonomous System Border Router (ASBR)

Router A
interface Loopback0

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Cisco OSPF Command and Configuration Handbook

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