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 10. Multiple Path Configuration

maximum-paths number-of-paths

Syntax Description:

number-of-paths—. Determines the number of parallel equal-cost paths to the same destination that OSPF will install in the IP routing table. The range of values is 1 to 6. The default is 4 paths.

Purpose: To configure the number of equal-cost parallel paths that OSPF will install in the IP routing table.

Initial Cisco IOS Software Release: 11.2

Configuration Example: Setting the Maximum Number of Equal-Cost Paths That OSPF Will Install in the IP Routing Table

In Figure 10-1, Router A has two parallel equal-cost paths to the loopback network on Router B. By default, OSPF will install both paths in the IP routing table. Configure Routers A and B as shown in the following ...

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Cisco OSPF Command and Configuration Handbook

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