Implementing IS-IS on Cisco IOS XR Software

How to Implement IS-IS on Cisco IOS XR Software

 

Command or Action

Purpose

Step 8

 

 

ignore-lsp-errors disable

(Optional) Sets the router to purge LSPs received with

 

 

checksum errors.

 

Example:

 

 

RP/0/RP0/CPU0:router(config-isis)#

 

 

ignore-lsp-errors disable

 

Step 9

 

 

interface type instance

Enters interface configuration mode.

 

Example:

 

 

RP/0/RP0/CPU0:router(config-isis)# interface

 

 

POS 0/1/0/3

 

Step 10

 

 

lsp-interval milliseconds [level {1 2}]

(Optional) Configures the amount of time between each

 

 

LSP sent on an interface.

 

Example:

 

 

RP/0/RP0/CPU0:router(config-isis-if)#

 

 

lsp-interval 100

 

Step 11

 

 

csnp-interval seconds [level {1 2}]

(Optional) Configures the interval at which periodic CSNP

 

 

packets are sent on broadcast interfaces.

 

Example:

Sending more frequent CSNPs means that adjacent

 

RP/0/RP0/CPU0:router(config-isis-if)#

routers must work harder to receive them.

 

csnp-interval 30 level 1

Sending less frequent CSNP means that differences in

 

 

 

 

the adjacent routers may persist longer.

Step 12

 

 

retransmit-interval seconds [level {1 2}]

(Optional) Configures the amount of time that the sending

 

 

router waits for an acknowledgment before it considers that

 

Example:

the LSP was not received and subsequently resends.

 

 

 

RP/0/RP0/CPU0:router(config-isis-if)#

 

 

retransmit-interval 60

 

Step 13

 

 

retransmit-throttle-interval milliseconds

(Optional) Configures the amount of time between

 

[level {1 2}]

retransmissions on each LSP on a point-to-point interface.

 

Example:

This time is usually greater than or equal to the

 

lsp-intervalcommand time because the reason for lost

 

RP/0/RP0/CPU0:router(config-isis-if)#

LSPs may be that a neighboring router is busy. A longer

 

retransmit-throttle-interval 1000

interval gives the neighbor more time to receive

 

 

 

 

transmissions.

Step 14

 

 

mesh-group {number blocked}

(Optional) Optimizes LSP flooding in NBMA networks

 

 

with highly meshed, point-to-point topologies.

 

Example:

This command is appropriate only for an NBMA

 

RP/0/RP0/CPU0:router(config-isis-if)#

network with highly meshed, point-to-point topologies.

 

mesh-group blocked

 

 

 

 

Cisco IOS XR Routing Configuration Guide

RC-104

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Cisco Systems IOS XR manual LSP was not received and subsequently resends, RC-104

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.