Routing Configuration Guide for Cisco NCS 560 Series Routers, IOS XR ...

Routing Configuration Guide for Cisco NCS 560 Series Routers, IOS XR Release 7.5.x

First Published: 2021-11-23 Last Modified: 2021-11-29

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CONTENTS

CHAPTER 1

Implementing IS-IS 1 Enable IS-IS and Configure Level 1 or Level 2 Routing 1 Single-Topology IPv6 3 Configure Single Topology for IS-IS 3 Set SPF Interval for a Single-Topology Configuration 8 Customize Routes for IS-IS 9 Set Priority for Adding Prefixes to RIB 12 IS-IS Interfaces 13 Tag IS-IS Interface Routes 14 Limit LSP Flooding 16 Control LSP Flooding for IS-IS 16 IS-IS Authentication 20 Configure Authentication for IS-IS 20 Configure Keychains for IS-IS 22 Nonstop Forwarding 23 Configure Nonstop Forwarding for IS-IS 24 ISIS NSR 26 Configuring ISIS-NSR 26 Multiprotocol Label Switching Traffic Engineering 28 Configure MPLS Traffic Engineering for IS-IS 28 MPLS TE Forwarding Adjacency 30 Tune Adjacencies for IS-IS 30 MPLS Label Distribution Protocol IGP Synchronization 33 Configuring MPLS LDP IS-IS Synchronization 33 IS-IS Overload Bit Avoidance 35 Configure IS-IS Overload Bit Avoidance 35

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CHAPTER 2

IS-IS Penalty for Link Delay Anomaly 36 References for IS-IS 37

IS-IS Functional Overview 37 Default Routes 37 Overload Bit on Router 37

Overload Bit Configuration During Multitopology Operation 38 Attached Bit on an IS-IS Instance 38 IS-IS Support for Route Tags 38 Flood Blocking on Specific Interfaces 38

Maximum LSP Lifetime and Refresh Interval 39 Mesh Group Configuration 39 Multi-Instance IS-IS 39 Label Distribution Protocol IGP Auto-configuration 39 MPLS LDP-IGP Synchronization Compatibility with LDP Graceful Restart 40 MPLS LDP-IGP Synchronization Compatibility with IGP Nonstop Forwarding 40

Implementing OSPF 41 Prerequisites for Implementing OSPF 42 Enable OSPF 42 Verify OSPF Configuration and Operation 44 Stub Area 46 Not-so-Stubby Area 47 Configure Stub and Not-So-Stubby Area Types 47 Neighbors and Adjacency for OSPF 50 Configure Neighbors for Nonbroadcast Networks 50 Authentication Strategies 54 Configure Authentication at Different Hierarchical Levels for OSPF Version 2 54 Control Frequency That Same LSA Is Originated or Accepted for OSPF 57 Virtual Link and Transit Area for OSPF 58 Create Virtual Link 59 Summarize Subnetwork LSAs on OSPF ABR 64 Route Redistribution for OSPF 66 Redistribute Routes into OSPF 66 Nonstop Forwarding for OSPF Version 2 69

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Configure Nonstop Forwarding Specific to Cisco for OSPF Version 2 69 OSPF Shortest Path First Throttling 71

Configure OSPF Shortest Path First Throttling 72 Graceful Restart for OSPFv3 74

Configure OSPFv3 Graceful Restart 74 Display Information About Graceful Restart 76

OSPFv2OSPF SPF Prefix Prioritization 76 Configure OSPFv2 OSPF SPF Prefix Prioritization 78

Configure OSPF as a Provider Edge to Customer Edge (PE-CE) Protocol 81 Create Multiple OSPF Instances (OSPF Process and a VRF) 83 Label Distribution Protocol IGP Auto-configuration for OSPF 85

Configure Label Distribution Protocol IGP Auto-configuration for OSPF 85 Configure LDP IGP Synchronization: OSPF 86 OSPF Authentication Message Digest Management 88 GTSM TTL Security Mechanism for OSPF 88 Configure Generalized TTL Security Mechanism (GTSM) for OSPF 89 OSPF Penalty for Link Delay Anomaly 91 IGP link state 92 References for OSPF 92 OSPF Functional Overview 92 Comparison of Cisco IOS XR Software OSPFv3 and OSPFv2 93 OSPF Hierarchical CLI and CLI Inheritance 94 OSPF Routing Components 94

Autonomous Systems 95 Areas 95 Routers 95 OSPF Process and Router ID 96 Supported OSPF Network Types 96 Route Authentication Methods for OSPF 97 Plain Text Authentication 97 MD5 Authentication 97 Key Rollover 97 OSPF FIB Download Notification 97 Designated Router (DR) for OSPF 98

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