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DESGN20SG


Designing Basic Campus and Data Center Networks

Designing for Cisco Internetwork Solutions (DESGN) v2.0

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-1

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Describing Campus Design Considerations
Designing Basic Enterprise Campus Networks

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-1

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Designing an Enterprise Campus
Campus design factors:
Network applications characteristics

Device characteristics
Environmental characteristics

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-2

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Overview of Network Application Types
Peer-to-peer Client-local server

Client-server farm
Client-enterprise edge Server

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-3

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Network Requirements of Applications
Connectivity type Total required throughput

High availability
Total network costs

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-4

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Example: Peer-to-Peer Applications
Instant messaging File sharing IP phone calls Video conference systems

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-5

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Example: Client-Local Server Applications
Servers are located close to clients. Servers and clients are in the same LAN. Request to servers from nonlocal LANs is rare.

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-6

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Example: Client-Server Farm Applications
Typical applications:
Mail servers File servers Database servers

Access to applications:
Fast
Reliable Controlled (security)

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-7

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Example: Client-Enterprise Edge Applications
Typical applications:
Internet applications – Mail servers – Web servers – Public Internet servers

E-commerce applications

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-8

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Relative Network Requirements by Application Type
Client-Local Servers Switched Medium Medium Medium Client-Server Farm Switched High High High Client-Enterprise Edge Servers Switched Medium High Medium

Peer-to-Peer Connectivity type Total required throughput High availability Total network costs Switched Medium to high Low to high Low to medium

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-9

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Environmental Characteristics for Network Design
The network devices and distances between them determine the network geography. The campus network design is scoped with respect to geography: – Intrabuilding – Interbuilding

– Distant remote buildings

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-10

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Intrabuilding Structure
Provides connectivity inside the building Built with the building access and building distribution layers Transmission options: – Copper – Optical fiber

– Wireless

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-11

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Interbuilding Structure
Connectivity between buildings Distances between buildings within a few kilometers Building distribution with campus core layer Typical transmission media: optical fiber

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-12

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Distant Remote Building Structure
Metropolitan-based network connectivity options: Using company-owned fiber Through enterprise WAN Through service provider offerings

WAN

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-13

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Campus Transmission Media
Physical media in network design influences: – Network bandwidth – Allowable distance between devices – Copper design considerations: Electromagnetic interference, grounding, security Signal attenuation, distance limitations Optical fiber design considerations: – Light signal (LED or laser) – Expensive, providing a long-term investment Wireless design considerations: – Distance, interference, bandwidth, security

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-14

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Comparison of Campus Transmission Media
Copper Twisted Pair Bandwidth Distance Up to10 Gbps Up to 100 m

Multimode Fiber Up to10 Gbps Up to 2 km (Fast Ethernet) Up to 550 m (Gigabit Ethernet) Up to 300 m (10 Gigabit Ethernet)

Single-Mode Fiber Up to10 Gbps or higher Up to 80 km (Fast Ethernet) Up to 100 m (Gigabit Ethernet) Up to 80 km (10 Gigabit Ethernet) Moderate to expensive

Wireless Up to 54 Mbps* Up to 500 m at 1 Mbps

Price

Inexpensive

Moderate

Moderate

*Wireless is half-duplex, so effective bandwidth will be no more than one half this rate.

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-15

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Example: Transmission Media

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-16

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Infrastructure Device Characteristics
Switches connect end devices as well as infrastructure devices:
Access layer is typically data link layer switches. Distribution and core layer typically use multilayer switches.

Switch type and switching layer decision is influenced by:
Infrastructure services requirements(QoS, including policing, and so on) Size of the network segments Expected network failure convergence times

Cost

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-17

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Example Network Service: QoS in LAN Switches

Enterprise QoS guarantees that critical applications receive the required bandwidth or services.
? 2007 Cisco Systems, Inc. All rights reserved. DESGN v2.0—3-18

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

Summary
Campus network design is influenced by several factors; first by applications characteristics, such as throughput and availability requirements.

Second are environmental characteristics, such as the location of devices and buildings and transmission media.
Third are infrastructure device characteristics, such switching type and support for network services.

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-19

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.

? 2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—3-20

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual self-study.


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