Cisco NCS 6000 Series User Manual

DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enables IS-IS routing for the specified routing process, and
places the router in router configuration mode. In this
example, the IS-IS instance is called isp.
router isis instance-id
Example:
RP/0/RP0/CPU0:router(config)# router isis isp
Step 2
Enters interface configuration mode.
interface type interface-path-id
Example:
Step 3
RP/0/RP0/CPU0:router(config-isis)# interface
GigabitEthernet 0/1/0/3
(Optional) Configures the type of adjacency.circuit-type { level-1 | level-1-2 | level-2-only }
Example:
Step 4
RP/0/RP0/CPU0:router(config-isis-if)# circuit-type
level-1
Specifies the IPv4 address family, and enters router address
family configuration mode.
address-family ipv4 unicast
Example:
Step 5
RP/0/RP0/CPU0:router(config-isis-if)#
address-family ipv4 unicast
Specifies the IP fast reroute loop-free alternate computation
on link or node failures.
ipfrr lfa { level { 1 | 2 }}
Example:
Step 6
RP/0/RP0/CPU0:router(config-isis-if-af)# ipfrr lfa
level 1
(Optional) Excludes an interface from the IP fast reroute
loop-free alternate computation.
ipfrr lfa exclude interface type interface-path-id
Example:
Step 7
RP/0/RP0/CPU0:router(config-isis-if-af)#ipfrr lfa
exclude interface POS 0/1/0/4
commit
Step 8
Configure Remote Loop-Free Alternate Paths for IS-IS
IP Fast Re-Route (FRR) with Loop-Free Alternate (LFA) paths uses only the immediate next hops
(directly-connected neighbors) as backups to a destination. Though this works well in most topologies, it fails
in ring topologies, because the immediate next hop is likely to use the source router itself to forward traffic,
thereby creating loops.
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
238
Implementing IS-IS
Configure Remote Loop-Free Alternate Paths for IS-IS

Cisco NCS 6000 Series Specifications

General

Brand	Cisco
Model	NCS 6000 Series
Category	Network Router
Language	English

Summary

Implementing BGP

Information About Implementing BGP

Explains core concepts for BGP implementation, including functional overview and router identifier.

BGP Configuration

Covers BGP configuration models, modes, and templates like af-group, session-group, and neighbor-group.

How to Implement BGP

Provides tasks for enabling BGP routing and establishing a BGP routing process.

Implementing BGP Flowspec

BGP Flow Specification

Explains how BGP flowspec allows rapid deployment and propagation of filtering and policing functionality for DDoS mitigation.

BGP Flowspec Conceptual Architecture

Configuring BGP Flowspec with ePBR

Explains procedures for configuring BGP flowspec with ePBR, including class map and policy map.

Implementing BFD

Information About BFD

Explains differences between BFD in Cisco IOS XR and Cisco IOS software, and BFD modes of operation.

How to Configure BFD

Provides guidelines and steps for configuring BFD under dynamic routing protocols or static routes.

Implementing EIGRP

Information About Implementing EIGRP

Explains EIGRP concepts, including functional overview, features, and components like DUAL.

EIGRP Components

Describes the four basic components of EIGRP: neighbor discovery, reliable transport protocol, DUAL, and protocol-dependent modules.

Stub Routing for an EIGRP Process

Implementing IS-IS

IS-IS Functional Overview

Explains IS-IS network structure, Level 1 and Level 2 adjacencies, and routing levels.

Key Features Supported in the Cisco IOS XR IS-IS Implementation

IS-IS Authentication

Implementing OSPF

Information About Implementing OSPF

Key Features Supported in the Cisco IOS XR Software OSPF Implementation

OSPF Hierarchical CLI and CLI Inheritance

Virtual Link and Transit Area for OSPF

Implementing IP Fast Reroute Loop-Free Alternate

LFA Overview

Configuring Fast Reroute Support

Implementing Routing Policy

Information About Implementing Routing Policy

Routing Policy Language Structure

Attach Points

BGP Policy Attach Points

Describes BGP policy attach points, including additional-path, neighbor-ORF, next-hop, clear-policy, and debug.

Implementing RCMD

Route Convergence Monitoring and Diagnostics

Explains RCMD as a mechanism to monitor OSPF and IS-IS convergence events, SPF runs, and route/LDP provisioning.

Configuring Route Convergence Monitoring and Diagnostics