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Planning Routing Services

Assessing Complex Enterprise Network Requirements

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Cisco Enterprise Architectures

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Cisco Hierarchical Network Model

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Example: Hierarchical Campus Model

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Example: Hierarchical Network Model WAN

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Enterprise Composite Network Model Functional Areas

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Enterprise Composite Network Model

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Converged network traffic mix: Voice and video traffic

Voice applications traffic

Mission-critical applications traffic

Transactional traffic

Routing update traffic

Network management traffic

Network Traffic Mix

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Key requirements: Performance

– Bandwidth

– Delay

– Jitter

Security

– Access

– Transmission

Network Requirements

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Example: Enterprise network

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Cisco SONA Framework

Cisco Service-Oriented Network Architecture (SONA) is an architectural framework.

Cisco SONA brings several advantages to enterprises:

– Outlines how enterprises can evolve toward the Intelligent Information Network (IIN)

– Illustrates how to build integrated systems across a fully converged intelligent network

– Improves flexibility and increases efficiency

– Optimizes applications, processes, and resources

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Cisco SONA Framework Layers

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Intelligent Information Network

IIN integrates networked resources and information assets.

IIN extends intelligence across multiple products and infrastructure layers.

IIN actively participates in the delivery of services and applications.

Three phases in building an IIN are:

– Integrated transport

– Integrated services

– Integrated applications

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Example: Enterprise Network

Networked infrastructure layer

Interactive services layer

Application layer

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Routing Protocols

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Routing Protocol Comparison

Parameters EIGRP OSPF BGP

Size of Network(Small-Medium-Large-Very Large)

Large Large Very Large

Speed of Convergence(Very High-High-Medium-Low)

Very High High Low

Use of VLSM(Yes-No)

Yes Yes Yes

Mixed-Vendor Devices(Yes-No)

No Yes Yes

Network Support Staff Knowledge(Good-Fair-Poor)

Good Good Fair

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Example: Enterprise Network

EIGRP is used as IGP

BGP is used as EGP

Static routes for remote access and VPN

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Summary

Cisco Enterprise Architectures with hierarchical network models facilitate the deployment of converged networks.

Converged networks with their traffic mix have higher demands on the network and its resources.

The SONA framework guides the evolution of the enterprise network toward the IIN.

The network models can be important tools for selecting and implementing an advanced IP routing protocol.

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