Implementing OSPF on Cisco IOS XR Software

How to Implement OSPF on Cisco IOS XR Software

 

Command or Action

Purpose

Step 9

 

 

neighbor ip-address[priority number]

Configures the IPv4 address of OSPF neighbors

 

[poll-interval seconds][cost number]

interconnecting to nonbroadcast networks.

 

or

or

 

neighbor ipv6-link-local-address [priority

 

Configures the link-local IPv6 address of OSPFv3

 

number] [poll-intervalseconds][cost number]

 

[database-filter [all]]

neighbors.

 

 

• The ipv6-link-local-addressmust be in the form that is

 

Example:

specified in RFC 2373. The address is specified in

 

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

hexadecimal using 16-bit values between colons.

 

neighbor 10.20.20.1 priority 3 poll-interval 15

• The priority keyword notifies the router that this

 

or

 

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

neighbor is eligible to become a DR or BDR. The

 

priority value should match the actual priority setting

 

neighbor fe80::3203:a0ff:fe9d:f3fe

 

on the neighbor router. The neighbor priority default

 

 

 

 

value is 0. This keyword does not apply to

 

 

point-to-multipoint interfaces.

 

 

• The poll-intervalkeyword does not apply to

 

 

point-to-multipoint interfaces. RFC 1247 recommends

 

 

that this value be much larger than the hello interval.

 

 

The default is 120 seconds (2 minutes).

 

 

• Neighbors with no specific cost configured assumes the

 

 

cost of the interface, based on the cost command. On

 

 

point-to-multipoint interfaces, cost number is the only

 

 

keyword and argument combination that works. The

 

 

cost keyword does not apply to NBMA networks.

 

 

• The database-filterkeyword filters outgoing LSAs to

 

 

an OSPF neighbor. If you specify the all keyword,

 

 

incoming and outgoing LSAs are filtered. Use with

 

 

extreme caution because filtering might cause the

 

 

routing topology to be seen as entirely different

 

 

between two neighbors, resulting in black-holing of

 

 

data traffic or routing loops.

Step 10

 

 

Repeat Step 9 for all neighbors on the interface.

—

Step 11

 

 

exit

Enters area configuration mode.

 

Example:

 

 

RP/0/RP0/CPU0:router(config-ospf-ar-if)# exit

 

Step 12

 

 

interface type instance

Enters interface configuration mode and associates one or

 

 

more interfaces for the area configured in Step 4.

 

Example:

• In this example, the interface inherits the nonbroadcast

 

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

network type and the hello and dead intervals from the

 

POS 0/3/0/1

areas because the values are not set at the interface

 

 

level.

 

 

 

Cisco IOS XR Routing Configuration Guide

RC-153

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Cisco Systems IOS XR manual RC-153
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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.
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