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BCMSN Module 1 Lesson 1

NetworkRequirements

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Obj ectivesD efine IIN and Cisco SONA frameworksD escribe the Cisco Enterprise Architecture and how it maps to thetraditional three-layer hierarchical network modelD escribe the devices in a nonhierarchical networkIdentify problems that can occur in a nonhierarchical switchednetworkIdentify problems that can occur in a nonhierarchical routednetworkD efine multilayer switches in a nonhierarchical networkList the issues that occur with multilayer switches and VLANs in anonhierarchical networkD escribe the Enterprise Composite module, which can be used todivide the enterprise network into physical, logical, and functionalboundariesList the benefits of the ECNMD

escribe the Campus Infrastructure module of the ECNM

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Cisco S ONA Framework Layers

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Cisco Enterprise Architecture

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Nonhierarchical Network Devices

Large collision domain

Large broadcastdomain

High latency

D ifficult to troubleshoot

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IssuesNo traffic between VLANs

Unbounded broadcast domain

Servers not centrally located

Layer 2 Switching

Hardware-based bridging

Wire-speed performance

Collision domain per port

Traffic containment basedon MAC address

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Layer 3 Routing

Single broadcast domainper interface

ACLs can be applied

between segments

IssuesHigh per-port cost

Layer 3 processing required

High latency over Layer 2 switching

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Multilayer Switching

Combined functionalityLayer 2 switching

Layer 3 switching

Layer 4 switchingLow latency

High-speedscalability

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Issues with Multilayer Switchesin a Nonhierarchical Network

Single point of failurefor Layers 2 and Layers 3

Underutilization of

hardwareSpanning treecomplexity

Serversnot centrallylocated

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H ierarchical Campus Model

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Enterprise Composite ModelFunctional 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 aremaking use of the SONA architecture.

Navigate to www.cisco.com and search on SONACase Studies.

From the SONA homepage, find the link for casestudies.

Select one of the case studies to read about anapplication 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 IntelligentInformation Network?

3. What are the main issues with non-hierarchicalnetwork devices?

4. How is the hierarchical model divided?

5. What are the 3 functional areas in the EnterpriseComposite Model?

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Summary

The SONA framework guides the evolution of theenterprise network towards IIN.

Cisco Enterprise Architecture with a hierarchicalnetwork model facilitates the deployment of convergednetworks.Nonhierarchical network designs do not scale and donot provide the required security necessary in a moderntopology.

Layer 2 networks do not provide adequate security or hierarchical networking.

Router-based networks provide greater security andhierarchical networking; however, they can introducelatency issues.

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Summary

Multilayer switches combine both Layer 2 and Layer 3functionality to support the modern campus networktopology.

Multilayer switches can be used in nonhierarchicalnetworks; however, they will not perform at the optimallevel.

The enterprise composite model identifies the keycomponents and logical design for a modern topology.

Implementation of an ECNM provides a secure, robustnetwork with high availability.

The Campus infrastructure, as part of an ECNM,provides additional security and high availability at alllevels of the campus.

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Q and A

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Resources

Cisco Service-Oriented Network Architecturehttp://cisco.com/en/US/partner/netsol/ns629/networking_solutions_market_segment_solutions_home.html

Cisco Intelligent Information Networkhttp://cisco.com/en/US/partner/netsol/ns650/networking_solutions_market_segment_solution.html

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