BLADEOS 6.5.2 Application Guide

Types of OSPF Areas

An AS can be broken into logical units known as areas. In any AS with multiple areas, one area must be designated as area 0, known as the backbone. The backbone acts as the central OSPF area. All other areas in the AS must be connected to the backbone. Areas inject summary routing information into the backbone, which then distributes it to other areas as needed.

As shown in Figure 30, OSPF defines the following types of areas:

￿Stub Area—an area that is connected to only one other area. External route information is not distributed into stub areas.

￿Not-So-Stubby-Area (NSSA)—similar to a stub area with additional capabilities. Routes originating from within the NSSA can be propagated to adjacent transit and backbone areas. External routes from outside the AS can be advertised within the NSSA but are not distributed into other areas.

￿Transit Area—an area that allows area summary information to be exchanged between routing devices. The backbone (area 0), any area that contains a virtual link to connect two areas, and any area that is not a stub area or an NSSA are considered transit areas.

Figure 30 OSPF Area Types

 

Backbone

 

 

 

Area 0

 

 

 

(Also a Transit Area)

 

 

ABR

 

ABR

 

 

ABR

 

 

Internal LSA

 

 

Virtual

Routes

 

 

Stub Area

Transit Area

Link

 

Not-So-Stubby Area

No External Routes

 

 

(NSSA)

from Backbone

ABR

 

 

 

 

 

 

External LSA

 

 

 

Routes

 

 

 

ASBR

 

 

 

ABR

= Area Border Router

Stub Area, NSSA,

or Transit

Area

ASBR = Autonomous System

Connected to Backbone

Non-OSPF Area

Boundary Router

via Virtual Link

RIP/BGP AS

 

 

 

274 ￿ Chapter 20: OSPF

BMD00220, October 2010

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Blade ICE G8124-E manual Types of Ospf Areas, Ospf Area Types
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G8124-E, G8124 specifications

The Blade ICE G8124 is a cutting-edge networking solution designed for high-performance data center environments. It has emerged as a popular choice among organizations that require reliable and efficient network infrastructure to support their growing demands for bandwidth and low-latency connectivity.

One of the key features of the Blade ICE G8124 is its high port density. This networking device typically offers 24 ports of 10 Gigabit Ethernet, ensuring that businesses can connect numerous devices without requiring extensive physical space. The design is also scalable, accommodating future expansion as organizational needs grow.

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The G8124 incorporates various technologies to enhance its functionalities. It supports Layer 2 and Layer 3 switching, making it versatile for different networking needs. Additionally, it features comprehensive Quality of Service (QoS) settings that prioritize critical applications, such as VoIP and video streaming, ensuring smooth operation even under heavy loads.

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In summary, the Blade ICE G8124 stands out with its high port density, advanced switching capabilities, robust security features, and efficient management options. This networking solution is designed to meet the demands of modern data centers, providing the performance, reliability, and scalability that organizations require. With its innovative technologies, the G8124 ensures that businesses can navigate the complexities of today's networking landscape effectively.
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