Information Technology Reference
In-Depth Information
high-speed switched backbone between buildings, to the server farm and towards the en-
terprise edge. This segment consists of redundant and fast-convergence connectivity. The
building distribution layer aggregates all the closet access switches and performs access
control, QoS, route redundancy, and load balancing. The building access switches provide
VLAN access, PoE for IP phones and wireless access points, broadcast suppression, and
spanning tree.
Enterprise Campus
Data Center
Campus
Core
Building
Distribution
Building
Access
Figure 2-6
Enterprise Campus Model
The server farm or data center provides high-speed access and high availability (redun-
dancy) to the servers. Enterprise servers such as file and print servers, application servers,
email servers, Dynamic Host Configuration Protocol (DHCP), and Domain Name System
(DNS) servers are placed in the server farm. Cisco Unified CallManager servers are placed
in the server farm for IP telephony networks. Network management servers are located in
the server farm, but these servers link to each module in the campus to provide network
monitoring, logging, trending, and configuration management.
An enterprise campus infrastructure can apply to small, medium, and large locations. In
most instances, large campus locations have a three-tier design with a wiring-closet com-
ponent (building access layer), a building distribution layer, and a campus core layer. Small
campus locations likely have a two-tier design with a wiring-closet component (Ethernet
ble to configure distribution functions in a multilayer building access device to maintain
