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White Paper

Introduction

The Cisco® Catalyst® 6500 Series Virtual Switching System (VSS) 1440 is an exciting innovation on the Cisco

Catalyst 6500 Series Switches that effectively allows the clustering of two or more physical chassis together into a

single, logical entity. This technology allows for new enhancements in all areas of network design, including high

availability, scalability, management, and maintenance.

This paper analyzes the Cisco VSS technology, including its benefits and requirements, and highlights potential

deployment caveats you should consider before deploying Cisco Virtual Switching System.

Cisco Catalyst 6500 Series Virtual Switching System 1440: An Overview

The Cisco Catalyst 6500 Series Virtual Switching System (VSS) 1440 allows for the merging of two physical Cisco

Catalyst 6500 Series Switches together into a single, logically managed entity. Figure 1 graphically represents this

concept where you can manage two Cisco Catalyst 6509 chassis as a single, 18-slot chassis after enabling Cisco

Virtual Switching System.

Figure 1. Cisco Virtual Switching System

Cisco Catalyst 6500 Series Virtual Switching System 1440 Architecture

The Cisco Catalyst 6500 Series Virtual Switching System 1440 allows for the combination of two switches into a

single, logical network entity from the network control-plane and management perspectives. To the neighboring

devices, the Cisco Virtual Switching System appears as a single, logical switch or router.

Within the Cisco Virtual Switching System, one chassis is designated as the active virtual switch and the other is

designated as the standby virtual switch. All control-plane functions, including management (Simple Network

Management Protocol [SNMP], Telnet, Secure Shell [SSH] Protocol), Layer 2 protocols (bridge protocol data units

[BPDUs], protocol data units [PDUs], Link Aggregation Control Protocol [LACP], Layer 3 protocols (routing protocols

and so on), and software data path are centrally managed by the active supervisor engine of the active virtual switch

chassis. The supervisor engine on the active virtual switch is also responsible for programming the hardware

forwarding information onto all the distributed forwarding cards (DFCs) across the entire Cisco Virtual Switching

System as well as the policy feature card (PFC) on the standby virtual switch supervisor engine. (See Figure 2.)

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