Information Technology Reference
In-Depth Information
Simplified management of a single configuration of the VSS distribution switch.
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Better return on investment (ROI) via increased bandwidth between the access layer
and the distribution layer.
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Uses existing Catalyst 6500 switches; no new chassis are needed.
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Traditional with STP
Between Access and
Distribution Layers
VSS 1440 Allows
Both Upstream Links
to Be Used
VSS Logical View
STP Blocked Links
Figure 2-4
VSS
The Cisco Enterprise Architecture model facilitates the design of larger, more scalable
networks.
As networks become more sophisticated, it is necessary to use a more modular approach
to design than just WAN and LAN core, distribution, and access layers. The architecture
divides the network into functional network areas and modules. These areas and modules
of the Cisco Enterprise Architecture are
Enterprise campus area
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Enterprise data center module
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Enterprise branch module
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Enterprise teleworker module
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The Cisco Enterprise Architecture model maintains the concept of distribution and access
components connecting users, WAN services, and server farms through a high-speed cam-
pus backbone. The modular approach in design should be a guide to the network archi-
tect. In smaller networks, the layers can collapse into a single layer, even a single device,
but the functions remain.
Figure 2-5 shows the Cisco Enterprise Architecture model. The enterprise campus area
