Network
Requirements
BSCI Module 1 Lesson 1
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Objectives
 Define IIN and Cisco SONA frameworks
 Describe the Cisco Enterprise Architecture and how it maps to the
traditional three-layer hierarchical network model
 Describe the devices in a nonhierarchical network
 Identify problems that can occur in a nonhierarchical switched
network
 Identify problems that can occur in a nonhierarchical routed
network
 Define multilayer switches in a nonhierarchical network
 List the issues that occur with multilayer switches and VLANs in a
nonhierarchical network
 Describe the Enterprise Composite module, which can be used to
divide the enterprise network into physical, logical, and functional
boundaries
 List the benefits of the ECNM
 Describe the Campus Infrastructure module of the ECNM
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Intelligent Information Network
 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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Cisco SONA Framework
 The Cisco Service-Oriented Network Architecture
(SONA) is an architectural framework.
 SONA brings several advantages to enterprises:
Outlines how enterprises can evolve towards the IIN
Illustrates how to build integrated systems across a fully
converged intelligent network
Improves flexibility and increases efficiency
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Cisco SONA Framework Layers
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Cisco Enterprise Architecture
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Nonhierarchical Network Devices
 Large collision domain
 Large broadcast
domain
 High latency
 Difficult to troubleshoot
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Layer 2 Switching
 Hardware-based bridging
 Wire-speed performance
 Collision domain per port
 Traffic containment based
on MAC address
Issues
 No traffic between VLANs
 Unbounded broadcast domain
 Servers not centrally located
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Layer 3 Routing
 Single broadcast domain
per interface
 ACLs can be applied
between segments
Issues
 High per-port cost
 Layer 3 processing required
 High latency over Layer 2 switching
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Multilayer Switching
 Combined functionality
Layer 2 switching
Layer 3 switching
Layer 4 switching
 Low latency
 High-speed
scalability
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Issues with Multilayer Switches
in a Nonhierarchical Network
 Single point of failure
for Layers 2 and Layers 3
 Underutilization of
hardware
 Spanning tree
complexity
 Servers
not centrally
located
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Hierarchical Campus Model
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Enterprise Composite Model
Functional Areas
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Enterprise Composite Network Model
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Modules in the Enterprise Campus
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Campus Infrastructure Module
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Activity
 Research case studies to see how enterprises are
making use of the SONA architecture.
 Navigate to www.cisco.com and search on “SONA
Case Studies”.
 From the SONA homepage, find the link for case
studies.
 Select one of the case studies to read about an
application of the SONA approach.
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Self Check
1. Name the 3 layers of the SONA Framework.
2. What are the 3 phases in building an Intelligent
Information Network?
3. What are the main issues with non-hierarchical
network devices?
4. How is the hierarchical model divided?
5. What are the 3 functional areas in the Enterprise
Composite Model?
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Summary
 The SONA framework guides the evolution of the
enterprise network towards IIN.
 Cisco Enterprise Architecture with a hierarchical
network model facilitates the deployment of converged
networks.
 Nonhierarchical network designs do not scale and do
not provide the required security necessary in a modern
topology.
 Layer 2 networks do not provide adequate security or
hierarchical networking.
 Router-based networks provide greater security and
hierarchical networking; however, they can introduce
latency issues.
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Summary
 Multilayer switches combine both Layer 2 and Layer 3
functionality to support the modern campus network
topology.
 Multilayer switches can be used in nonhierarchical
networks; however, they will not perform at the optimal
level.
 The enterprise composite model identifies the key
components and logical design for a modern topology.
 Implementation of an ECNM provides a secure, robust
network with high availability.
 The Campus infrastructure, as part of an ECNM,
provides additional security and high availability at all
levels of the campus.
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Q and A
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Resources
 Cisco Service-Oriented Network Architecture
http://cisco.com/en/US/partner/netsol/ns629/networking_solutio
ns_market_segment_solutions_home.html
 Cisco Intelligent Information Network
http://cisco.com/en/US/partner/netsol/ns650/networking_solutio
ns_market_segment_solution.html
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