Cisco Systems IOS XR manual Enabling BGP Routing, Prerequisites, RC-28

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Implementing BGP on Cisco IOS XR Software

How to Implement BGP on Cisco IOS XR Software

Tuning the BGP Best Path Calculation, page RC-39(optional)

Indicating BGP Backdoor Routes, page RC-41(optional)

Configuring Aggregate Addresses, page RC-43(optional)

Redistributing iBGP Routes into IGP, page RC-44(optional)

Redistributing Prefixes into Multiprotocol BGP, page RC-46(optional)

Configuring BGP Route Dampening, page RC-48(optional)

Applying Policy When Updating the Routing Table, page RC-52(optional)

Setting BGP Administrative Distance, page RC-53(optional)

Configuring a BGP Neighbor Group, page RC-55(optional)

Configuring a BGP Neighbor, page RC-58(required)

Configuring a Route Reflector for BGP, page RC-60(optional)

Configuring BGP Route Filtering by Route Policy, page RC-62(optional)

Disabling Next Hop Processing on BGP Updates, page RC-64(optional)

Configuring BGP Community and Extended-Community Filtering, page RC-65(optional)

Configuring Software to Store Updates from a Neighbor, page RC-67(optional)

Disabling a BGP Neighbor, page RC-69(optional)

Resetting Neighbors Using BGP Dynamic Inbound Soft Reset, page RC-71(optional)

Resetting Neighbors Using BGP Outbound Soft Reset, page RC-71(optional)

Resetting Neighbors Using BGP Hard Reset, page RC-72(optional)

Clearing Caches, Tables and Databases, page RC-73(optional)

Displaying System and Network Statistics, page RC-73(optional)

Monitoring BGP Update Groups, page RC-75(optional)

Enabling BGP Routing

Perform this task to enable BGP routing and establish a BGP routing process. Configuring BGP neighbors is included as part of enabling BGP routing.

Note At least one neighbor and at least one address family must be configured to enable BGP routing. At least one neighbor with both a remote AS and an address family must be configured globally using the address family and remote as commands.

Prerequisites

BGP must be able to obtain a router identifier (for example, a configured loopback address). At least, one address family must be configured in the BGP router configuration and the same address family must also be configured under the neighbor.

Cisco IOS XR Routing Configuration Guide

RC-28

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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 XiiiXiv Obtaining Technical AssistanceCisco Technical Support & Documentation Website Obtaining Additional Publications and Information Submitting a Service RequestDefinitions of Service Request Severity Xvi Contents Implementing BGP on Cisco IOS XR SoftwareBGP Functional Overview RC-2RC-3 BGP Default LimitsBGP Router Identifier 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 RC-11 Template InheritanceShow bgp neighbors 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-20RC-21 Multiprotocol BGPBest Path Change Suppression 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 ModelRC-27 How to Implement BGP on Cisco IOS XR SoftwareDefault Address Family for show Commands RC-28 Enabling BGP RoutingPrerequisites 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-33RC-34 Adjusting BGP TimersLogging Neighbor Changes 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 RC-71 Resetting Neighbors Using BGP Dynamic Inbound Soft ResetResetting Neighbors Using BGP Outbound Soft Reset Resetting Neighbors Using BGP Hard Reset RC-72RC-73 Clearing Caches, Tables and DatabasesDisplaying System and Network Statistics Performance-statistics keyword displays RC-74Monitoring BGP Update Groups RC-75Enabling BGP Example RC-76Displaying BGP Update Groups Example RC-77RC-78 BGP Neighbor Configuration ExampleBGP Confederation Example RC-79 Where to Go NextBGP Route Reflector Example Additional References Related DocumentsStandards MIBsTechnical Assistance RFCsDescription Link RC-81RC-82 Implementing IS-IS on Cisco IOS XR Software RC-83RC-84 RC-85 IS-IS Configuration GroupingIS-IS Functional Overview 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 SupportRC-88 Multitopology IPv6 SupportNonstop Forwarding 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-90RC-91 How to Implement IS-IS on Cisco IOS XR SoftwareEnabling IS-IS and Configuring Level 1 or Level 2 Routing 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 RC-110 Configuring Mpls Traffic Engineering for IS-ISPrerequisite 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 RC-118 Enabling Multicast-Intact for IS-ISSummary Steps 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-131RC-132 Ospf Routing ComponentsAutonomous Systems 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-138RC-139 Route Redistribution for OspfOspf Shortest Path First Throttling Nonstop Forwarding for Ospf Version RC-140RC-141 Load Balancing in Ospf Version 2 and OSPFv3Graceful Restart for OSPFv3 RC-142 Helper ModeModes of Graceful Restart Operation 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 RC-164 Summarizing Subnetwork LSAs on an Ospf ABRExamples 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-181RC-182 Configuring the Maximum Lifetime of a Graceful RestartEnabling Graceful Restart Configuring the Minimum Time Required Between Restarts RC-183Configuring the Helper Level of the Router RC-184RC-185 Displaying the State of the Graceful Restart FeatureDisplaying Information About Graceful Restart Enabling Multicast-Intact for OSPFv2 RC-186RC-187 RC-188 Cisco IOS XR for Ospf Version 2 Configuration ExampleCisco IOS XR Software Configuration 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 RC-200 Configuration Examples for RIB MonitoringOutput of show route Command Example 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 ExampleRC-202 Output of show route longer-prefixes Command ExampleOutput of show route next-hop Command Example 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-209RC-210 Prefix-setInline Form 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-214RC-215 Semantics of Policy ApplicationBoolean Operator Precedence RC-216 When Attributes Are ModifiedMultiple Modifications of the Same Attribute RC-217 Default Drop DispositionControl Flow 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-222RC-223 Attach PointsApply RC-224 BGP Policy Attach PointsAggregation RC-225 Default OriginateDampening RC-226 Neighbor ExportNeighbor Import RC-227 NetworkRedistribute Show bgp RC-228RC-229 Table PolicyBGP Attributes and Operators Attribute Match Set RC-230Ospf Policy Attach Points Import Export Aggregation Redistribution Prepend as-pathSet med igp-cost SuppressRC-232 OSPFv3 Policy Attach PointsOspf Attributes and Operators OSPFv3 Attributes and Operators RC-233RC-234 IS-IS Policy Attach PointsIS-IS Attributes and Operators Editing Routing Policy Configuration Elements Attached Policy ModificationNonattached Policy Modification RC-235Editing Routing Policy Configuration Elements Using the CLI RC-236RC-237 How to Implement Routing PolicyDefining a Route Policy 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-247RC-248 Default Administrative DistanceStatic Route Functional Overview RC-249 Directly Connected RoutesRecursive Static Routes 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.