NAD 3020 manual Aggregation Layer, Access Layer

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Aggregation Layer

Design Guide

Figure 7. Data Center Front-End Network

Aggregation Layer

The aggregation layer is a point of convergence for network traffic that provides connectivity between server farms and the rest of the enterprise. The aggregation layer supports Layer 2 and Layer 3 functions and presents an ideal location for deploying centralized application, security, and management services. Shared across the access layer server farms, these data center services provide an efficient, scalable, predictable, and deterministic behavior common to server-farm needs.

The aggregation layer provides a comprehensive set of features for the data center. The following devices support these features:

●Multilayer aggregation switches

●Load-balancing devices

●Firewalls

●IDSs

●Content engines

●Secure Sockets Layer (SSL) offloaders

●Network-analysis devices

Access Layer

The primary role of the access layer is to provide the server farms with port density. In addition, it must be a flexible, efficient, and predictable environment supporting client-to-server and server-to- server traffic. A Layer 2 domain meets these requirements by providing the following:

●Adjacency between servers and service devices

●A deterministic, fast-converging, loop-free topology

© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.

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Contents Center Network Architecture Switch 3020 for the HP c-ClassIntegrating the Cisco Catalyst Blade BladeSystem into the Cisco DataContents Design Guide IntroductionHP c-ClassBladeSystem Enclosure Overview Design Guide Page 5 of Cisco Catalyst Blade Switch 3020 for HPSpanning Tree Cisco Catalyst Blade Switch 3020 FeaturesDesign Guide Traffic Monitoring Design Guide Figure 5. RSPAN Example Link Aggregation ProtocolsData Center Network Components Data Center Network ArchitectureAggregation Layer Access LayerDesign Guide High AvailabilityDesign Goals High AvailabilityHigh Availability for the Blade Servers Physical Port Count ScalabilityDesign Guide Slot CountOut-of-BandManagement ManagementDesign Guide In-BandManagementSerial Console Port Network Management Recommendations Design and Implementation DetailsRecommended Topology Primary root switch failure and recovery Additional Aggregation-SwitchConfiguration Configuring the Aggregate SwitchesConfiguring the Cisco Catalyst Blade Switch 3020s Alternative Topology Configuring the Cisco Catalyst Blade Switch 3020s Configuration DetailsConfiguring the Aggregate Switches Inter-SwitchLink Configuration Port-ChannelConfigurationVLAN Configuration RPVST+ ConfigurationTrunking Configuration Server-PortConfiguration Server Default Gateway Configuration Page 28 of RSPAN Configuration
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3020 specifications

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