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2007 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

Course v6 Chapter #1

Chapter 1:Analyzing The Cisco

Enterprise CampusArchitecture

CCNP SWITCH: Implementing IP Switching

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Chapter #2 2007 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

Chapter 1 Objectives

Describe common campus design options and how design

choices affect implementation and support of a campus

LAN.

Describe the access, distribution, and core layers.

Describe small, medium, and large campus network

designs.

Describe the prepare, plan, design, implement, operate,

optimize (PPDIOO) methodology.

Describe the network lifecycle approach to campus design.

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Introduction toEnterpriseCampusNetwork Design

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Enterprise Network

Core (Backbone)

Campus

Data Center

Branch

WAN Internet Edge

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Regulatory Standards (U.S.)

There may be several legal regulations that have an impact

on a networks design.

US regulations on networks include:

Health Insurance Portability and Accountability Act (HIPAA)

Sarbanes-Oxley Act

Records to Be Preserved by Certain Exchange Members, Brokers

and Dealers: Securities and Exchange Commission (SEC) Rule 17a-

4

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Campus Designs

Modular- easily supports growth and change. Scaling the

network is eased by adding new modules in lieu of

complete redesigns.

Resilient - proper high-availability (HA) characteristics

result in near-100% uptime.

Flexible - change in business is a guarantee for any

enterprise. These changes drive campus network

requirements to adapt quickly.

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7 2007 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

Multilayer Switches in Campus Networks

Hardware-based routing using

Application-Specific IntegratedCircuits (ASICs)

RIP, OSPF, and EIGRP are

supported

Layer 3 switching speeds

approximate that of Layer 2

switches

Layer 4 and Layer 7 switching

supported on some switches

Future: Pure Layer 3environment leveraging

inexpensive L3 access layer

switches

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Cisco Switches

Catalyst 6500 Family used in campus, data center, andcore as well as WAN and branch Up to 13 slots and 16 10-Gigabit Ethernet interfaces

Redundant power supplies, fans, and supervisor engines

Runs Cisco IOS

Catalyst 4500 Family used in distribution layer and incollapsed core environments Up to 10 slots and several 10-Gigabit Ethernet interfaces

Runs Cisco IOS

Catalyst 3560 and 3750 Families used in fixed-portscenarios at the access and distribution layers

Nexus 2000, 5000, and 7000 Families NX-OS basedmodular data center switches

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Multilayer Switching Miscellany

ASIC-based (hardware)

switching is supported even

with QoS and ACLs,

depending on the platform;

6500 switches support

hardware-based switchingwith much larger ACLs than

3560 switches.

ASICs on Catalyst switches

work in tandem with ternary

content addressable memory(TCAM) and packet-matching

algorithms for high-speed

switching.

Catalyst 6500 switches with

a Supervisor Engine 720 and

a Multilayer Switch Feature

Card (MSFC3) must

software-switch all packets

requiring Network AddressTranslation.

Unlike CPUs, ASICs scale in

switching architectures.

ASICs integrate onto

individual line modules ofCatalyst switches to

hardware-switch packets in a

distributed manner.

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Traffic Types

Network Management BPDU, CDP, SNMP, RMON, SSH

traffic (for example); low bandwidth

IP Telephony Signaling traffic and encapsulated voice traffic;

low bandwidth

IP Multicast IP/TV and market data applications; intensive

configuration requirements; very high bandwidth Normal Data File and print services, email, Internet browsing,

database access, shared network applications; low to medium

bandwidth

Scavenger Class All traffic with protocols or patterns thatexceed normal data flows; less than best-effort traffic, such as

peer-to-peer traffic (instant messaging, file sharing, IP phone

calls, video conferencing); medium to high bandwidth

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Client-Server Applications

Mail servers

File servers

Database servers

Access to applications is

fast, reliable, and secure

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Client-Enterprise Edge Applications

Servers on the enterprise

edge, exchanging data

between an organization

and its public servers

Examples: external mail

servers, e-commerceservers, and public web

servers

Security and high

availability are paramount

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Service-Oriented Network Architecture (SONA)

Application Layer business and collaboration applications; meet business

requirements leveraging interactive services layer.

Interactive Services Layer enable efficient allocation of resources to

applications and business processes through the networked infrastructure.

Networked Infrastructure Layer where all IT resources interconnect.

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Borderless Networks

Enterprise architecture launched by Cisco in October 2009.

Model enables businesses to transcend borders, access

resources anywhere, embrace business productivity, and

lower business and IT costs.

Focuses more on growing enterprises into global

companies.

Technical architecture based on three principles:

Decoupling hardware from software

Unifying computation, storage, and network

Policy throughout the unified system

Provides a platform for business innovation.

Serves as the foundation for rich-media communications.

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EnterpriseCampus Design

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Building Access, Building Distribution, and BuildingCore Layers

Building Core Layer: high-speed campus backbone

designed to switch packets as

fast as possible; provides high

availability and adapts quickly to

changes.

Building Distribution Layer:

aggregate wiring closets and

use switches to segment

workgroups and isolate network

problems.

Building Access Layer: grant

user access to network devices.

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Core Layer

Aggregates distribution layer switches.

Implements scalable protocols and technologies and load

balancing.

High-speed layer 3 switching using 10-Gigabit Ethernet.

Uses redundant L3 links.

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Distribution Layer

High availability, fast path recovery, load balancing, QoS, and security

Route summarization and packet manipulation

Redistribution point between routing domains

Packet filtering and policy routing to implement policy-based connectivity

Terminate VLANs

First Hop Redundancy Protocol

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Access Layer

High availability supported by many hardware and software features, such

as redundant power supplies and First Hop Redundancy Protocols (FHRP).

Convergence provides inline Power over Ethernet (PoE) to support IP

telephony and wireless access points.

Security includes port security, DHCP snooping, Dynamic ARP inspection, IP

source guard.

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Small Campus Network

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Medium Campus Network

200-1000 end devices

Redundant multilayer switches at distribution layer

Catalyst 4500 or 6500 switches

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Large Campus Network

>2000 end users

Stricter adherence to core, distribution, access delineation

Catalyst 6500 switches in core and distribution layers

Nexus 7000 switches in data centers

Division of labor amongst network engineers

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Data Center Infrastructure

Core layer high-speed packet switching backplane

Aggregation layer service module integration, default gateway

redundancy, security, load balancing, content switching, firewall, SSL

offload, intrusion detection, network analysis

Access layer connects servers to network

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PPDIOO LifecycleApproach to

Network DesignandImplementation

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PPDIOO Phases

Prepare establish organizational requirements.

Plan identify initial network requirements.

Design comprehensive, based on planning outcomes.

Implement build network according to design.

Operate maintain network health.

Optimize proactive management of network.

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Lifecycle Approach

Lowering the total cost of

network ownership

Increasing network

availability

Improving business agility

Speeding access to

applications and services

Identifying and validating

technology requirements

Planning for infrastructure

changes and resource

requirements

Developing a sound

network design alignedwith technicalrequirements and businessgoals

Accelerating successfulimplementation

Improving the efficiency ofyour network and of thestaff supporting it

Reducing operatingexpenses by improving theefficiency of operationalprocesses and tools

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Lifecycle Approach (1)

Benefits:

Lowering the total cost of network ownership

Increasing network availability

Improving business agility

Speeding access to applications and services

Lower costs: Identify and validate technology requirements

Plan for infrastructure changes and resource requirements

Develop a sound network design aligned with technical requirementsand business goals

Accelerate successful implementation Improve the efficiency of your network and of the staff supporting it

Reduce operating expenses by improving the efficiency of operationalprocesses and tools

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Lifecycle Approach (2)

Improve high availability:

Assessing the networks security state and its capability to support the proposed design

Specifying the correct set of hardware and software releases, and keeping them operational and current

Producing a sound operations design and validating network operations

Staging and testing the proposed system before deployment

Improving staff skills

Proactively monitoring the system and assessing availability trends and alerts

Gain business agility:

Establishing business requirements and technology strategies Readying sites to support the system that you want to implement

Integrating technical requirements and business goals into a detailed design and demonstrating

that the network is functioning as specified

Expertly installing, configuring, and integrating system components

Continually enhancing performance

Accelerate access to network applications and services:

Assessing and improving operational preparedness to support current and planned network technologiesand services

Improving service-delivery efficiency and effectiveness by increasing availability, resource capacity, andperformance

Improving the availability, reliability, and stability of the network and the applications running on it

Managing and resolving problems affecting your system and keeping software applications current

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Planning a Network Implementation

Implementation Components:

Description of the step

Reference to design documents

Detailed implementation guidelines

Detailed roll-back guidelines in case of failure

Estimated time needed for implementation

Summary Implementation Plan overview of

implementation plan

Detailed Implementation Plan describes exact steps

necessary to complete the implementation phase, includingsteps to verify and check the work of the network engineers

implementing the plan

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Chapter 1 Summary

Evolutionary changes are occurring within the campus

network. Evolution requires careful planning and deployments based

on hierarchical designs.

As the network evolves, new capabilities are added, usually

driven by application data flows. Implementing the increasingly complex set of business-

driven capabilities and services in the campus architectureis challenging if done in a piecemeal fashion.

Any successful architecture must be based on a foundationof solid design theory and principles. The adoption of anintegrated approach based on solid systems designprinciples is a key to success.

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Lab 1-1 Clearing a Switch

Lab 1-2 Clearing a Switch Connected to a Larger Network

Chapter 1 Labs

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Resources

www.cisco.com/en/US/products
http://www.cisco.com/en/US/productshttp://www.cisco.com/en/US/products

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Documents

SW-Ch01.ppt