Cisco Systems IOS XR manual Summarizing Subnetwork LSAs on an Ospf ABR, Examples, RC-164

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Implementing OSPF on Cisco IOS XR Software

How to Implement OSPF on Cisco IOS XR Software

Examples

In the following example, the show ospfv3 virtual links EXEC command verifies that the OSPF_VL0 virtual link to the OSPFv3 neighbor is up, the ID of the virtual link interface is 2, and the IPv6 address of the virtual link endpoint is 2003:3000::1.

RP/0/RP0/CPU0:router# show ospfv3 virtual-links

Virtual Links for OSPFv3 1

Virtual Link OSPF_VL0 to router 10.0.0.3 is up

Interface ID 2, IPv6 address 2003:3000::1

Run as demand circuit

DoNotAge LSA allowed.

Transit area 0.1.20.255, via interface POS 0/1/0/1, Cost of using 2

Transmit Delay is 5 sec, State POINT_TO_POINT,

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

Hello due in 00:00:02

Adjacency State FULL (Hello suppressed)

Index 0/2/3, retransmission queue length 0, number of retransmission 1

First 0(0)/0(0)/0(0) Next 0(0)/0(0)/0(0)

Last retransmission scan length is 1, maximum is 1

Last retransmission scan time is 0 msec, maximum is 0 msec

Check for lines:

Virtual Link OSPF_VL0 to router 10.0.0.3 is up

Adjacency State FULL (Hello suppressed)

State is up and Adjacency State is FULL

Summarizing Subnetwork LSAs on an OSPF ABR

If you configured two or more subnetworks when you assigned your IP addresses to your interfaces, you might want the software to summarize (aggregate) into a single LSA all of the subnetworks that the local area advertises to another area. Such summarization would reduce the number of LSAs and thereby conserve network resources. This summarization is known as interarea route summarization. It applies to routes from within the autonomous system. It does not apply to external routes injected into OSPF by way of redistribution.

This task configures OSPF to summarize subnetworks into one LSA, by specifying that all subnetworks that fall into a range are advertised together. This task is performed on an ABR only.

SUMMARY STEPS

1.configure

2.router ospf process-name or

router ospfv3 process-name

3.router-id{ipv4-address interface-type interface-instance}

4.area area-id

5.range ip-address mask [advertise not-advertise] or

range ipv6-prefix/prefix-length[advertise not-advertise]

6.interface type instance

Cisco IOS XR Routing Configuration Guide

RC-164

Image 180
Contents Cisco IOS XR Routing Configuration Guide Corporate HeadquartersCisco IOS XR Routing Configuration Guide N T E N T S Enabling BGP Routing RC-ivStandards RC-80 MIBs MIBs Cisco IOS XR for Ospf Version 2 Configuration Example RC-viiOutput of show route backup Command Example RC-201 RC-viiiRecursive Static Routes RC-249 RC-ixRC-x Document Revision History Revision Date Change SummaryObtaining Documentation Cisco.comProduct Documentation DVD Ordering DocumentationReporting Security Problems in Cisco Products Documentation FeedbackCisco Product Security Overview XiiiObtaining Technical Assistance Cisco Technical Support & Documentation WebsiteXiv Submitting a Service Request Definitions of Service Request SeverityObtaining Additional Publications and Information Xvi Contents Implementing BGP on Cisco IOS XR SoftwareBGP Functional Overview RC-2BGP Default Limits BGP Router IdentifierRC-3 BGP Configuration Configuration ModesBGP Validation of Local Next-Hop Addresses RC-4Router Configuration Mode Global Address Family Configuration ModeNeighbor Configuration Mode Neighbor Address Family Configuration ModeConfiguration Templates RC-6Template Inheritance Rules RC-7RC-8 RC-9 RC-10 Template Inheritance Show bgp neighborsRC-11 Show bgp af-group RC-12Show bgp session-group RC-13Show bgp neighbor-group RC-14No Default Address Family RC-15Routing Policy Enforcement RC-16RC-17 Update Groups BGP Update Generation and Update GroupsBGP Update Group Table PolicyComparing Pairs of Paths RC-19Order of Comparisons RC-20Multiprotocol BGP Best Path Change SuppressionRC-21 RC-22 Incongruent Unicast and Multicast RoutesRoute Dampening RC-23BGP Routing Domain Confederation BGP Route ReflectorsMinimizing Flapping RC-24RC-25 Three Fully Meshed iBGP SpeakersRC-26 More Complex BGP Route Reflector ModelHow to Implement BGP on Cisco IOS XR Software Default Address Family for show CommandsRC-27 Enabling BGP Routing PrerequisitesRC-28 Command or Action Purpose RestrictionsExample RC-29As a BGP peer RC-30Configuring a Routing Domain Confederation for BGP RC-31RC-32 Resetting eBGP Session Immediately Upon Link Failure RC-33Adjusting BGP Timers Logging Neighbor ChangesRC-34 Changing the BGP Default Local Preference Value RC-35Configuring the MED Metric for BGP RC-36RC-37 Configuring BGP Weights RC-38Tuning the BGP Best Path Calculation RC-39Path the least desirable path RC-40Indicating BGP Backdoor Routes RC-41RC-42 Configuring Aggregate Addresses RC-43Redistributing iBGP Routes into IGP RC-44RC-45 Redistributing Prefixes into Multiprotocol BGP RC-46To be redistributed into BGP RC-47Configuring BGP Route Dampening RC-48RC-49 RC-50 RC-51 Applying Policy When Updating the Routing Table RC-52Setting BGP Administrative Distance RC-53RC-54 Configuring a BGP Neighbor Group RC-55RC-56 Bytes for the BGP buffer RC-57Configuring a BGP Neighbor RC-58RC-59 Configuring a Route Reflector for BGP RC-60RC-61 Configuring BGP Route Filtering by Route Policy RC-62RC-63 Disabling Next Hop Processing on BGP Updates RC-64Configuring BGP Community and Extended-Community Filtering RC-65RC-66 Configuring Software to Store Updates from a Neighbor RC-67RC-68 Disabling a BGP Neighbor RC-69RC-70 Resetting Neighbors Using BGP Dynamic Inbound Soft Reset Resetting Neighbors Using BGP Outbound Soft ResetRC-71 Resetting Neighbors Using BGP Hard Reset RC-72Clearing Caches, Tables and Databases Displaying System and Network StatisticsRC-73 Performance-statistics keyword displays RC-74Monitoring BGP Update Groups RC-75Enabling BGP Example RC-76Displaying BGP Update Groups Example RC-77BGP Neighbor Configuration Example BGP Confederation ExampleRC-78 Where to Go Next BGP Route Reflector ExampleRC-79 Additional References Related DocumentsStandards MIBsTechnical Assistance RFCsDescription Link RC-81RC-82 Implementing IS-IS on Cisco IOS XR Software RC-83RC-84 IS-IS Configuration Grouping IS-IS Functional OverviewRC-85 Multitopology Configuration IPv6 Routing and Configuring IPv6 AddressingIS-IS Interfaces Limit LSP FloodingOverload Bit Configuration During Multitopology Operation Mesh Group ConfigurationMaximum LSP Lifetime and Refresh Interval Single-Topology IPv6 SupportMultitopology IPv6 Support Nonstop ForwardingRC-88 Multiprotocol Label Switching Traffic Engineering Multi-Instance IS-ISOverload Bit on Router RC-89Default Routes Multicast-Intact FeatureAttached Bit on an IS-IS Instance RC-90How to Implement IS-IS on Cisco IOS XR Software Enabling IS-IS and Configuring Level 1 or Level 2 RoutingRC-91 RC-92 Configuring Single Topology for IS-IS RC-93Ipv4 address address mask or RC-94Specifying the ipv6 address ipv6-prefix /prefix-length RC-95See the Single-Topology IPv6 Support section on RC-96Level-2-only adjacencies RC-97Configuring Multitopology for IS-IS RC-98RC-99 RC-100 RC-101 Controlling LSP Flooding for IS-IS RC-102Max-lsp-lifetime command RC-103LSP was not received and subsequently resends RC-104RC-105 Configuring Nonstop Forwarding for IS-IS RC-106RC-107 Configuring Authentication for IS-IS RC-108RC-109 Configuring Mpls Traffic Engineering for IS-IS PrerequisiteRC-110 RC-111 RC-112 Tuning Adjacencies for IS-IS on Point-to-Point Interfaces RC-113To all interfaces RC-114RC-115 Command or Action Purpose RC-116RC-117 Enabling Multicast-Intact for IS-IS Summary StepsRC-118 Customizing Routes for IS-IS RC-119RC-120 Instance 2 routes into its Level 1 area RC-121Configuring Single-Topology IS-IS for IPv6 Example RC-122Configuring Multitopology IS-IS for IPv6 Example RC-123RC-124 RC-125 RC-126 Implementing Ospf on Cisco IOS XR Software RC-127Information About Implementing Ospf on Cisco IOS XR Software RC-128Ospf Functional Overview RC-129RC-130 Comparison of Cisco IOS XR OSPFv3 and OSPFv2 Importing Addresses into OSPFv3Ospf Hierarchical CLI and CLI Inheritance RC-131Ospf Routing Components Autonomous SystemsRC-132 Areas Backbone AreaStub Area Not-so-Stubby Area NssaOspf Process and Router ID RoutersArea Border Routers ABR Autonomous System Boundary Routers AsbrRoute Authentication Methods for Ospf Version Plain Text AuthenticationMD5 Authentication Supported Ospf Network TypesAuthentication Strategies Neighbors and Adjacency for OspfDesignated Router DR for Ospf Key RolloverDefault Route for Ospf Link-State Advertisement Types for Ospf VersionLink-State Advertisement Types for OSPFv3 RC-137Virtual Link and Transit Area for Ospf RC-138Route Redistribution for Ospf Ospf Shortest Path First ThrottlingRC-139 Nonstop Forwarding for Ospf Version RC-140Load Balancing in Ospf Version 2 and OSPFv3 Graceful Restart for OSPFv3RC-141 Helper Mode Modes of Graceful Restart OperationRC-142 Graceful Restart Requirements and Restrictions RC-143How to Implement Ospf on Cisco IOS XR Software RC-144Enabling Ospf RC-145RC-146 Configuring Stub and Not-so-Stubby Area Types RC-147RC-148 Default-information-originate, and no-summary RC-149Configuring Neighbors for Nonbroadcast Networks RC-150RC-151 RC-152 RC-153 RC-154 RC-155 Message-digest-key key-idmd5 key clear key encrypted key RC-156RC-157 Ospf RC-158Default is 1 second RC-159RC-160 RC-161 Section on page RC-138 RC-162RC-163 Summarizing Subnetwork LSAs on an Ospf ABR ExamplesRC-164 RC-165 Redistributing Routes from One IGP into Ospf RC-166RC-167 Another routing domain RC-168RC-169 Configuring Ospf Shortest Path First Throttling RC-170RC-171 RC-172 Configuring Nonstop Forwarding for Ospf Version RC-173RC-174 Configuring Ospf Version 2 for Mpls Traffic Engineering RC-175Mpls traffic-eng area area-id RC-176RC-177 RC-178 RP/0/RP0/CPU0router# show route ospf 1Sample Output for the show ospf mpls traffic-eng Command RC-179Verifying Ospf Configuration and Operation RC-180Configuring OSPFv3 Graceful Restart RC-181Configuring the Maximum Lifetime of a Graceful Restart Enabling Graceful RestartRC-182 Configuring the Minimum Time Required Between Restarts RC-183Configuring the Helper Level of the Router RC-184Displaying the State of the Graceful Restart Feature Displaying Information About Graceful RestartRC-185 Enabling Multicast-Intact for OSPFv2 RC-186RC-187 Cisco IOS XR for Ospf Version 2 Configuration Example Cisco IOS XR Software ConfigurationRC-188 CLI Inheritance and Precedence for Ospf Version 2 Example RC-189Mpls TE for Ospf Version 2 Example ABR with Summarization for OSPFv3 ExampleABR Stub Area for OSPFv3 Example RC-190Virtual Link Configured Through Area 1 for OSPFv3 Example ABR Totally Stub Area for OSPFv3 ExampleRoute Redistribution for OSPFv3 Example RC-191RC-192 MIBs RC-193RC-194 Implementing and Monitoring RIB on Cisco IOS XR Software RC-195Information About RIB Configuration Overview of RIBRIB Data Structures in BGP and Other Protocols RC-196RIB Administrative Distance Protocol Administrative Distance DefaultRIB Support for IPv4 and IPv6 RC-197How to Deploy and Monitor RIB Verifying RIB Configuration Using the Routing TableVerifying Networking and Routing Problems RC-198RC-199 Configuration Examples for RIB Monitoring Output of show route Command ExampleRC-200 Output of show route backup Command Example Output of show route best-local Command ExampleOutput of show route connected Command Example Output of show route local Command ExampleOutput of show route longer-prefixes Command Example Output of show route next-hop Command ExampleRC-202 Cisco IOS XR Multicast Command Reference, Release RC-203RC-204 Implementing Routing Policy on Cisco IOS XR Software RC-205Prerequisites for Implementing Routing Policy Information About Implementing Routing PolicyRouting Policy Language Routing Policy Language OverviewRouting Policy Language Structure NamesSets RC-207As-path-set Named Set FormInline Set Form RC-208Community-set Extcommunity-setNamed Form RC-209Prefix-set Inline FormRC-210 Routing Policy Language Components Routing Policy Language UsagePass policy RC-211Ignore routes with specific AS numbers in the path Set community based on MEDSet local preference based on community RC-212Routing Policy Configuration Basics Policy DefinitionsPersistent Remarks RC-213Parameterization RC-214Semantics of Policy Application Boolean Operator PrecedenceRC-215 When Attributes Are Modified Multiple Modifications of the Same AttributeRC-216 Default Drop Disposition Control FlowRC-217 Policy Verification Range CheckingIncomplete Policy and Set References RC-218Policy Statements RemarkAttached Policy Modification Verification of Attribute Comparisons and ActionsDisposition RC-220Action RC-221Boolean Conditions RC-222Attach Points ApplyRC-223 BGP Policy Attach Points AggregationRC-224 Default Originate DampeningRC-225 Neighbor Export Neighbor ImportRC-226 Network RedistributeRC-227 Show bgp RC-228Table Policy BGP Attributes and OperatorsRC-229 Attribute Match Set RC-230Ospf Policy Attach Points Import Export Aggregation Redistribution Prepend as-pathSet med igp-cost SuppressOSPFv3 Policy Attach Points Ospf Attributes and OperatorsRC-232 OSPFv3 Attributes and Operators RC-233IS-IS Policy Attach Points IS-IS Attributes and OperatorsRC-234 Editing Routing Policy Configuration Elements Attached Policy ModificationNonattached Policy Modification RC-235Editing Routing Policy Configuration Elements Using the CLI RC-236How to Implement Routing Policy Defining a Route PolicyRC-237 Attaching a Routing Policy to a BGP Neighbor RC-238Enters address family configuration mode RC-239Modifying a Routing Policy Using the Microemacs Editor RC-240Routing Policy Definition Example RC-241Simple Inbound Policy Example RC-242Modular Inbound Policy Example RC-243Routing Policy Language Commands on Cisco IOS XR Software RC-244RC-245 RC-246 Software RC-247Default Administrative Distance Static Route Functional OverviewRC-248 Directly Connected Routes Recursive Static RoutesRC-249 Configuring a Static Route Fully Specified Static RoutesFloating Static Routes RC-250Configuring a Floating Static Route RC-251RC-252 Changing the Maximum Number of Allowable Static Routes RC-253RC-254 Configuration Examples Configuring Traffic Discard ExampleConfiguring a Fixed Default Route Example Configuring a Floating Static Route ExampleRC-256 D E RC-257RC-258 RC-259 RC-260 IS-IS RC-90 RC-261MD5 RC-262RFC 2328, Ospf Version RC-263RC-264 RC-265 RC-266
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IOS XR specifications

Cisco Systems IOS XR is an advanced operating system designed specifically for high-performance routers and service provider networks. It serves as the backbone for many of Cisco's high-end routing platforms, enabling service providers to manage their networks with increased efficiency, flexibility, and scalability.

One of the main features of IOS XR is its modular architecture. This allows for the independent operation of various components within the OS, facilitating the deployment of new features and updates without affecting the overall stability of the system. This modularity ensures that service providers can implement rapid changes and enhancements while maintaining service continuity.

Another characteristic of IOS XR is its support for 64-bit architecture, which provides enhanced performance and the ability to manage larger amounts of data. This is particularly beneficial for service providers that deal with high traffic volumes and require robust data processing capabilities. The utilization of 64-bit technology also enables the operating system to utilize memory more efficiently, allowing for greater scalability.

IOS XR incorporates advanced technologies such as Distributed System Architecture (DSA) and Multiple Routing Instances (Merging Routes). DSA allows for the distribution of routing processes across multiple hardware resources, maximizing performance and redundancy. Multiple Routing Instances enable operators to create separate logical routing tables for different services, improving isolation and efficiency in managing network traffic.

The operating system also focuses heavily on security, featuring extensive encryption methods and access controls to safeguard network resources. IOS XR supports various authentication protocols, ensuring secure access to routers and switches. In addition, the OS includes comprehensive logging and monitoring capabilities, allowing network administrators to track activities and respond quickly to potential threats.

Another critical aspect of IOS XR is its adherence to the principles of service-oriented architecture (SOA). This approach permits the development of applications and services that can operate independently, fostering innovation and enabling service providers to tailor their offerings based on customer demands.

Ultimately, Cisco IOS XR is a powerful, reliable operating system that meets the complex needs of modern telecommunications networks. With its focus on modularity, performance, security, and scalability, it enables service providers to deliver high-quality, resilient services to their customers while efficiently managing network resources. As the industry continues to evolve, IOS XR remains a vital tool for those aiming to stay competitive in the ever-changing landscape of networking.