switch10s01l01_analyzing campus network design

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2009 Cisco Systems, Inc. All rights reserved. SWITCH v1.01-1

Analyzing Campus Network Designs

Enterprise CampusArchitecture


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Overview of Cisco SONA


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Benefits of SONA

Description

Functionality Supports the organizational requirements.

Scalability Supports growth and expansion of organizational tasks.

Availability Provides necessary services reliably anywhere, anytime.

Performance Provides responsiveness, throughput, and utilization on a per-application basis.

Manageability Provides control, performance monitoring, and fault detection.

Efficiency Provides network services with reasonable operational costsand appropriate capital investment.


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Layers in the Hierarchical Model


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Enterprise Campus Architecture


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Access Layer

Provides access and aggregation for users in a feature-rich environment.

Provides high availability through software attributes and redundancy.

Supports convergence for voice, wireless, and data.

Provides security services to help control network access.

Offers QoS services including traffic classification and queuing.

Supports IP multicast traffic for efficient network use.


7/19 2009 Cisco Systems, Inc. All rights reserved. SWITCH v1.01-7

Distribution Layer

Aggregates access nodes and uplinks.

Provides redundant connections and devices for high availability.

Offers routing services such as summarization, redistribution, and

default gateways.

Implements policies including filtering, security, and QoSmechanisms.

Segments workgroups and isolates problems.



Core Layer

The core layer is a high-speed backbone and aggregation point

for the enterprise.

It provides reliability through redundancy and fast convergence.

The separate core layer helps in scalability during future growth.



Is a Core Layer Needed?



Campus Core Layer

Benefits of a campus core:

Distribution layer switches are connected hierarchically

Less physical cabling is required

Less routing complexity is imposed



Small Campus Network

Collapse the campus backbone and building distribution

submodules in the campus backbone submodule.

Scale up to several building access switches.



Medium Campus Network



Data Center Infrastructure Overview



Network Traffic Types

Traffic types to consider:

Network management

IP telephony

IP multicast

Normal data

Scavenger class



Peer-to-Peer Applications

Instant messaging

File sharing

IP phone calls

Video conference systems



Client Server Farm Applications

Typical applications:

Mail servers

File servers

Database servers

Access to applications:

Fast

Reliable

Controlled (security)



Client Enterprise Edge Applications

Typical applications:

Internet applications Mail servers

Web servers

Public Internet servers

E-commerce applications



Summary

SONA describes the infrastructure, services, and applications in anetwork.

The Cisco Enterprise Campus Architecture provides a modular

view of a network, making it easier to design and build a network.

The campus core layer interconnects the different buildings in thecampus, simplifying and optimizing distribution switches

interconnection and routing within the campus network.

The need for a core layer depends on the type of traffic that flows

through the network; each type of traffic has its specific flow

pattern and bandwidth requirements.


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switch10s01l01_analyzing campus network design

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