Assessing Complex
Enterprise Network
Requirements
Planning Routing Services
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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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Network Traffic Mix
Converged network traffic mix:
 Voice and video traffic
 Voice applications traffic
 Mission-critical applications traffic
 Transactional traffic
 Routing update traffic
 Network management traffic
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Network Requirements
Key requirements:
 Performance
– Bandwidth
– Delay
– Jitter
 Security
– Access
– Transmission
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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
Large
Large
Very Large
Very High
High
Low
Use of VLSM
(Yes-No)
Yes
Yes
Yes
Mixed-Vendor Devices
(Yes-No)
No
Yes
Yes
Good
Good
Fair
Size of Network
(Small-Medium-Large-Very Large)
Speed of Convergence
(Very High-High-Medium-Low)
Network Support Staff Knowledge
(Good-Fair-Poor)
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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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