Chapter 3 Configuring Additional Router Features

Configuration Limiting

The following sections describe the limits you can configure, default and maximum values, and commands for configuring and displaying the configuration limits:

Static Route Configuration Limits, page 3-18

IS-IS Configuration Limits, page 3-19

OSPFv2 and v3 Configuration Limits, page 3-19

BGP Configuration Limits, page 3-22

Routing Policy Language Line and Policy Limits, page 3-24

Multicast Configuration Limits, page 3-26

MPLS Configuration Limits, page 3-27

Static Route Configuration Limits

Table 3-4summarizes the maximum limits for static routes, including the commands used to display and change the limits.

Table 3-4

Static Route Configuration Limits and Commands

 

 

 

 

 

 

 

 

 

Default

Absolute

 

 

 

 

Maximum

Maximum

Configuration Command

Show Current Settings Command

Feature Limit Description

Limit

Limit

(Global Configuration Mode)

(EXEC Mode)

 

 

 

 

 

Maximum static IPv4

4000

128,000

route maximum ipv4 n

show running-config route maximum

routes

 

 

 

 

 

 

 

 

 

 

Maximum static IPv61

4000

128,000

route maximum ipv6 n

show running-config route maximum

routes

 

 

 

 

 

 

 

 

 

 

 

1. IPv6 is not supported on the Cisco XR 12000 Series Router.

Examples

In the following example, the maximum number of static IPv4 routes is changed to 5000. The new setting is then displayed with the show running-config route maximum command.

RP/0/RP1/CPU0:router# configure

RP/0/RP1/CPU0:router(config)#

route maximum ipv4 5000

RP/0/RP1/CPU0:router(config)#

commit

RP/0/RP1/CPU0:Mar 30 15:50:38

: ipv4_static[214]: %IP_STATIC-6-CONFIG_MAXIMUM_CH

ANGE : The maximum number of configurations for static routes has been changed f

rom 4000 to 5000

 

RP/0/RP1/CPU0:Mar 30 15:50:39

: config[65740]: %LIBTARCFG-6-COMMIT : Configurati

on committed by user 'lab'.

Use 'show configuration commit changes 1000000538' to view

the c

 

hanges.

 

RP/0/RP1/CPU0:router(config)#

end

RP/0/RP1/CPU0:Mar 30 15:50:46

: config[65740]: %SYS-5-CONFIG_I : Configured from

console by lab

 

RP/0/RP1/CPU0:router# show running-config route maximum route maximum ipv4 5000

RP/0/RP1/CPU0:router#

Cisco IOS XR Getting Started Guide

3-18

Page 18
Image 18
Cisco Systems IOS XR manual Static Route Configuration Limits, Default Absolute, Exec Mode

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.