BCMSN30S01 Network Design

7/28/2019 BCMSN30S01 Network Design

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Introducing Campus Networks

Network Requirements



Intelligent Information Network

• Intelligent Information Network (IIN) integrates networkedresources and information assets.

• IIN extends intelligence across multiple products andinfrastructure layers.

• IIN actively participates in the delivery of services andapplications.

• Three phases in building an IIN are:

– Integrated transport

– Integrated services

– Integrated applications



Cisco SONA Framework

• The Cisco Service-Oriented Network Architecture (SONA) isan architectural framework.

• SONA brings several advantages to enterprises:

– Outlines how enterprises can evolve toward the IIN

– Illustrates how to build integrated systems across a fullyconverged intelligent network

– Improves flexibility and increases efficiency



Cisco SONA Framework Layers



Cisco Enterprise Architecture



Nonhierarchical Network Devices

• Large collision domain

• Large broadcast domain

• High latency

• Difficult to troubleshoot



Issues

• No 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 based on

MAC address



Layer 3 Routing

• Single broadcast domain per interface

• ACLs can be applied betweensegments

Issues

• High per-port cost

• Layer 3 processing required

• High latency over Layer 2 switching



Multilayer Switching

• Combined functionality

– Layer 2 switching



• Low latency

• High-speedscalability



Issues with Multilayer Switchesin a Nonhierarchical Network

• Single point of failurefor Layer 2 and Layer 3

• Underutilization of hardware

•

Spanning treecomplexity

• Serversnot centrallylocated



Hierarchical Campus Model



ECNM Functional Areas



Enterprise Composite Network Model



Modules in the Enterprise Campus



Campus Infrastructure Module



Switch Configuration Interfaces

• Two interfaces are used to configure Cisco Catalystswitches:

– Cisco Catalyst software

– Cisco IOS

• Cisco Catalyst software was traditionally used to configureLayer 2 parameters on the modular switches:

– Cisco Catalyst 4000, 5500, 6500 Series

– These switches now support Cisco IOS (native IOS)

•

Cisco IOS software is standard for most other switches andfor Layer 3 configuration on the modular switches.



Cisco Catalyst Software

• Cisco Catalyst software is used toconfigure Layer 2 parameters.

• Cisco Catalyst softwareconfiguration commands areprefaced with the keyword set.

– Console(enable) set portenable 3/5

• Layer 3 configuration isimplemented on MSFC with the

Cisco IOS interface.• Some platforms can now use the

Cisco IOS interface to configureboth Layer 2 and Layer 3(native IOS).

Cisco Catalyst 4000, 5500,and 6500 switches



Cisco IOS Interface

On most Catalyst switches, Cisco IOS interface isstandard for

• Layer 2 configuration

• Layer 3 configuration

on multilayer switch



Summary

• The SONA framework guides the evolution of the enterprisenetwork toward IIN.

• Cisco enterprise architecture with a hierarchical networkmodel facilitates the deployment of converged networks.

•Nonhierarchical network designs do not scale and do notprovide 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 introduce latencyissues.



Summary (Cont.)

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

• Multilayer switches can be used in nonhierarchical networks;however, they will not perform at the optimal level.

• 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, providesadditional security and high availability at all levels of thecampus.

• The two Cisco Catalyst switch interfaces have differentfeatures and different font.



BCMSN30S01 Network Design

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