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Cisco IOS XR Routing Configuration Guide
Cisco IOS XR Software Release 3.2
Text Part Number: OL-5554-05
Contents
Main
Cisco IOS XR Routing Configuration Guide
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CONTENTS
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Preface
Document Revision History
Obtaining Documentation
Cisco.com
Product Documentation DVD
Ordering Documentation
Documentation Feedback
Cisco Product Security Overview
Reporting Security Problems in Cisco Products
Obtaining Technical Assistance
Cisco Technical Support & Documentation Website
Submitting a Service Request
Definitions of Service Request Severity
Obtaining Additional Publications and Information
Page
Implementing BGP on Cisco IOS XR Software
Prerequisites for Implementing BGP on Cisco IOS XR Software
Information About Implementing BGP on Cisco IOS XR Software
BGP Functional Overview
BGP Router Identifier
BGP Default Limits
BGP Validation of Local Next-Hop Addresses
BGP Configuration
Configuration Modes
Router Configuration Mode
Global Address Family Configuration Mode
Neighbor Submode
Configuration Templates
Template Inheritance Rules
Page
RC-9
RC-10
4. Otherwise, the default value is used. In the example that foll ows, neighbor 10.0.101.5 has the
Template Inheritance
show bgp neighbors
show bgp af-group
show bgp session-group
show bgp neighbor-group
No Default Address Family
Routing Policy Enforcement
RC-17
Table Policy
Update Groups
BGP Update Generation and Update Groups
BGP Update Group
BGP Best Path Algorithm
Comparing Pairs of Paths
Order of Comparisons
Best Path Change Suppression
Multiprotocol BGP
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Route Dampening
Minimizing Flapping
BGP Routing Domain Confederation
BGP Route Reflectors
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Default Address Family for show Commands
How to Implement BGP on Cisco IOS XR Software
Enabling BGP Routing
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Configuring a Routing Domain Confederation for BGP
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Resetting eBGP Session Immediately Upon Link Failure
Logging Neighbor Changes
Adjusting BGP Timers
Changing the BGP Default Local Preference Value
Configuring the MED Metric for BGP
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Configuring BGP Weights
Tuning the BGP Best Path Calculation
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Indicating BGP Backdoor Routes
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Configuring Aggregate Addresses
Redistributing iBGP Routes into IGP
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Redistributing Prefixes into Multiprotocol BGP
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Configuring BGP Route Dampening
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RC-50
Command or Action Purpose
Step6
Clears BGP flap statistics for all routes.
/prefix-length
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Applying Policy When Updating the Routing Table
Setting BGP Administrative Distance
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Configuring a BGP Neighbor Group
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Configuring a BGP Neighbor
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Configuring a Route Reflector for BGP
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Configuring BGP Route Filtering by Route Policy
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Disabling Next Hop Processing on BGP Updates
Configuring BGP Community and Extended-Community Filtering
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Configuring Software to Store Updates from a Neighbor
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Disabling a BGP Neighbor
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Resetting Neighbors Using BGP Dynamic Inbound Soft Reset
Resetting Neighbors Using BGP Outbound Soft Reset
Resetting Neighbors Using BGP Hard Reset
Clearing Caches, Tables and Databases
Displaying System and Network Statistics
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Monitoring BGP Update Groups
RC-76
Configuration Examples for Implementing BGP on Cisco IOS XR
This section provides the following configuration examples:
Enabling BGP: Example
The following shows how to enable BGP.
RC-77
Displaying BGP Update Groups: Example
The following is sample output from the show bgp update-group command executed in EXEC mode:
BGP Neighbor Configuration: Example
BGP Confederation: Example
BGP Route Reflector: Example
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Implementing IS-IS on Cisco IOS XR Software
Prerequisites for Implementing IS-IS on Cisco IOS XR Software
Restrictions for Implementing IS-IS on Cisco IOS XR Software
Information About Implementing IS-IS on Cisco IOS XR Software
IS-IS Functional Overview
Key Features Supported in the Cisco IOS XR IS-IS Implementation
IS-IS Configuration Grouping
IS-IS Interfaces
Multitopology Configuration
IPv6 Routing and Configuring IPv6 Addressing
Limit LSP Flooding
Flood Blocking on Specific Interfaces
Maximum LSP Lifetime and Refresh Interval
Overload Bit Configuration During Multitopology Operation
Single-Topology IPv6 Support
Multitopology IPv6 Support
Nonstop Forwarding
Multi-Instance IS-IS
Multiprotocol Label Switching Traffic Engineering
Overload Bit on Router
Default Routes
Attached Bit on an IS-IS Instance
Multicast-Intact Feature
How to Implement IS-IS on Cisco IOS XR Software
Enabling IS-IS and Configuring Level 1 or Level 2 Routing
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Configuring Single Topology for IS-IS
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Configuring Multitopology for IS-IS
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Controlling LSP Flooding for IS-IS
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Configuring Nonstop Forwarding for IS-IS
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Configuring Authentication for IS-IS
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Configuring MPLS Traffic Engineering for IS-IS
Prerequisite
Page
Page
Tuning Adjacencies for IS-IS on Point-to-Point Interfaces
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Setting SPF Interval for a Single-Topology IPv4 and IPv6 Configuration
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Enabling Multicast-Intact for IS-IS
Customizing Routes for IS-IS
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Configuration Examples for Implementing IS-IS on Cisco IOS XR
Configuring Single-Topology IS-IS for IPv6: Example
RC-123
Configuring Multitopology IS-IS for IPv6: Example
Redistributing IS-IS Routes Between Multiple Instances: Example
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Implementing OSPF on Cisco IOS XR Software
Prerequisites for Implementing OSPF on Cisco IOS XR Software
Information About Implementing OSPF on Cisco IOS XR
OSPF Functional Overview
Key Features Supported in the Cisco IOS XR OSPF Implementation
Comparison of Cisco IOS XR OSPFv3 and OSPFv2
Importing Addresses into OSPFv3
OSPF Hierarchical CLI and CLI Inheritance
OSPF Routing Components
Autonomous Systems
Areas
Backbone Area
Stub Area
Not-so-Stubby Area (NSSA)
Routers
OSPF Process and Router ID
Supported OSPF Network Types
Route Authentication Methods for OSPF Version 2
Plain Text Authentication
MD5 Authentication
Authentication Strategies
Neighbors and Adjacency for OSPF
Designated Router (DR) for OSPF
Default Route for OSPF
Link-State Advertisement Types for OSPF Version 2
Link-State Advertisement Types for OSPFv3
Virtual Link and Transit Area for OSPF
Route Redistribution for OSPF
OSPF Shortest Path First Throttling
Nonstop Forwarding for OSPF Version 2
Load Balancing in OSPF Version 2 and OSPFv3
Graceful Restart for OSPFv3
Modes of Graceful Restart Operation
Restart Mode
Helper Mode
Graceful Restart Requirements and Restrictions
Multicast-Intact Feature
How to Implement OSPF on Cisco IOS XR Software
Enabling OSPF
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Configuring Stub and Not-so-Stubby Area Types
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Page
Configuring Neighbors for Nonbroadcast Networks
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Configuring Authentication at Different Hierarchical Levels for OSPF Version 2
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Controlling the Frequency that the Same LSA Is Originated or Accepted for OSPF
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Creating a Virtual Link with MD5 Authentication to Area 0 for OSPF
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Summarizing Subnetwork LSAs on an OSPF ABR
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Redistributing Routes from One IGP into OSPF
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Configuring OSPF Shortest Path First Throttling
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Configuring Nonstop Forwarding for OSPF Version 2
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Configuring OSPF Version 2 for MPLS Traffic Engineering
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RC-179
Sample Output for the show ospf mpls traffic-eng Command
Verifying OSPF Configuration and Operation
Configuring OSPFv3 Graceful Restart
Enabling Graceful Restart
Configuring the Maximum Lifetime of a Graceful Restart
Configuring the Minimum Time Required Between Restarts
Configuring the Helper Level of the Router
Displaying Information About Graceful Restart
Enabling Multicast-Intact for OSPFv2
Configuration Examples for Implementing OSPF on Cisco IOS XR
Cisco IOS XR for OSPF Version 2 Configuration: Example
CLI Inheritance and Precedence for OSPF Version 2: Example
RC-190
MPLS TE for OSPF Version 2: Example
ABR with Summarization for OSPFv3: Example
The following example shows the prefix range 2300::/16 summarized fr om area 1 into the backbone:
ABR Stub Area for OSPFv3: Example
The following example shows that area 1 is configured as a stub area:
ABR Totally Stub Area for OSPFv3: Example
The following example shows that area 1 is configured as a totally stub area:
Route Redistribution for OSPFv3: Example
Virtual Link Configured Through Area 1 for OSPFv3: Example
ABR 1 Configuration
Virtual Link Configured with MD5 Authentication for OSPF Version 2: Example
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Implementing and Monitoring RIB on Cisco IOS XR Software
Prerequisites for Implementing RIB on Cisco IOS XR Software
Information About RIB Configuration
Overview of RIB
RIB Data Structures in BGP and Other Protocols
RIB Administrative Distance
RIB Support for IPv4 and IPv6
How to Deploy and Monitor RIB
Verifying RIB Configuration Using the Routing Table
Verifying Networking and Routing Problems
RC-199
Displays local routes for receive entries in the routing table.
interface
instance
protocol
Configuration Examples for RIB Monitoring
Output of show route Command: Example
RC-201
Output of show route backup Command: Example
The following is sample output from the show route backup command:
Output of show route best-local Command: Example
The following is sample output from the show route best-local command:
Output of show route longer-prefixes Command: Example
Output of show route next-hop Command: Example
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Page
Implementing Routing Policy on Cisco IOS XR Software
Prerequisites for Implementing Routing Policy
Information About Implementing Routing Policy
Routing Policy Language
Routing Policy Language Overview
Routing Policy Language Structure
Names
Sets
as-path-set
community-set
extcommunity-set
prefix-set
Routing Policy Language Components
Routing Policy Language Usage
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Routing Policy Configuration Basics
Policy Definitions
Parameterization
Semantics of Policy Application
Boolean Operator Precedence
Multiple Modifications of the Same Attribute
When Attributes Are Modified
Default Drop Disposition
Control Flow
Policy Verification
Range Checking
Incomplete Policy and Set References
Attached Policy Modification
Verification of Attribute Comparisons and Actions
Policy Statements
Remark
Disposition
Action
If
Boolean Conditions
apply
Attach Points
BGP Policy Attach Points
Aggregation
Dampening
Neighbor Export
Neighbor Import
Network
Show bgp
Table Policy
BGP Attributes and Operators
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OSPF Policy Attach Points
OSPF Attributes and Operators
OSPFv3 Policy Attach Points
OSPFv3 Attributes and Operators
IS-IS Policy Attach Points
IS-IS Attributes and Operators
Attached Policy Modification
Nonattached Policy Modification
Editing Routing Policy Configuration Elements
Editing Routing Policy Configuration Elements Using the EMACS Editor
RC-236
Editing Routing Policy Configuration Elements Using the CLI
How to Implement Routing Policy
Defining a Route Policy
Attaching a Routing Policy to a BGP Neighbor
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Modifying a Routing Policy Using the Microemacs Editor
Configuration Examples for Implementing Routing Policy
Routing Policy Definition: Example
Simple Inbound Policy: Example
Modular Inbound Policy: Example
Translating Cisco IOS Route Maps to Cisco IOS XR Routing Policy Language: Example
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Implementing Static Routes on Cisco IOS XR Software
Prerequisites for Implementing Static Routes on Cisco IOS XR
Information About Implementing Static Routes on Cisco IOS XR
Static Route Functional Overview
Default Administrative Distance
Directly Connected Routes
Recursive Static Routes
Fully Specified Static Routes
Floating Static Routes
How to Implement Static Routes on Cisco IOS XR Software
Configuring a Static Route
Configuring a Floating Static Route
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Changing the Maximum Number of Allowable Static Routes
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Configuration Examples
Configuring Traffic Discard: Example
Configuring a Fixed Default Route: Example
Configuring a Floating Static Route: Example
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