Chapter 3 Configuring Additional Router Features

Configuration Limiting

Maximum Interfaces for Each OSPF Instance

In the following example, the show ospf command is used to display the maximum number of OSPF interfaces:

RP/0/RP1/CPU0:router# show ospf

Routing Process "ospf 100" with ID 0.0.0.0 Supports only single TOS(TOS0) routes Supports opaque LSA

It is an area border router

Initial SPF schedule delay 5000 msecs

Minimum hold time between two consecutive SPFs 10000 msecs Maximum wait time between two consecutive SPFs 10000 msecs Initial LSA throttle delay 500 msecs

Minimum hold time for LSA throttle 5000 msecs Maximum wait time for LSA throttle 5000 msecs

Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs Maximum number of configured interfaces 255

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The following example configures the maximum interface limit on a router:

RP/0/RP1/CPU0:router# configure RP/0/RP1/CPU0:router(config)# router ospf 100 RP/0/RP1/CPU0:router(config-router)# maximum interfaces 600 RP/0/RP1/CPU0:router(config-router)# end

Uncommitted changes found, commit them? [yes]: y

RP/0/RP1/CPU0:Mar 30 16:12:39 : config[65740]: %LIBTARCFG-6-COMMIT : Configurati

on committed by user 'lab'. Use 'show configuration commit changes 1000000540' to view the c

hanges.

RP/0/RP1/CPU0:Mar 30 16:12:39 : config[65740]: %SYS-5-CONFIG_I : Configured from console by lab

RP/0/RP1/CPU0:router# show ospf

Routing Process "ospf 100" with ID 0.0.0.0 Supports only single TOS(TOS0) routes Supports opaque LSA

It is an area border router

Initial SPF schedule delay 5000 msecs

Minimum hold time between two consecutive SPFs 10000 msecs Maximum wait time between two consecutive SPFs 10000 msecs Initial LSA throttle delay 500 msecs

Minimum hold time for LSA throttle 5000 msecs Maximum wait time for LSA throttle 5000 msecs

Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs Maximum number of configured interfaces 600

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Cisco IOS XR Getting Started Guide

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Cisco Systems IOS XR manual Maximum Interfaces for Each Ospf Instance

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.