Hierarchical Arrangement Design
The campus arrangement can be structured so that anniversary of the three types of cartage flows or services
outlined in Table 2-3 can be best supported. Cisco has devised a hierarchical admission to
network architecture that enables arrangement designers to logically actualize a arrangement by defining and
using layers of devices. The consistent arrangement is efficient, intelligent, scalable, and easily
managed.
Table 2-3 Types of Arrangement Services
Service Type Location of Service Extent of Cartage Flow
Local Same segment/VLAN as user Admission band only
Remote Different segment/VLAN as user Admission to administration layers
Enterprise Central to all campus users Admission to administration to amount layers
Hierarchical Arrangement Architecture 31
The hierarchical archetypal break a campus arrangement bottomward into three audible layers, as illustrated
in Figure 2-6.
Figure 2-6 Hierarchical Arrangement Design
These layers are the admission layer, administration layer, and the amount layer. Anniversary band has attributes
that accommodate both concrete and analytic arrangement functions at the adapted point in the campus
network. Understanding anniversary band and its functions or limitations is important so that the layer
can be appropriately activated in the architecture process.
Access Layer
The admission band is present area the end users are affiliated into the network. Accessories in this
layer should accept the afterward capabilities:
• Low cost
• Aerial anchorage density
• Scalable uplinks to college layers
• User admission functions—VLAN associates and cartage clarification based on MAC addresses
• Resiliency through assorted uplinks
Distribution Layer
The administration band provides alternation amid the admission and amount layers of the
campus network. Accessories in this band should accept the afterward capabilities:
• Aerial Band 3 throughput for packet handling
• InterVLAN acquisition through Band 3 operations
Access
layer
Distribution
layer
Core
layer
32 Chapter 2: Campus Arrangement Architecture Models
• Media adaptation to carriage abstracts amid antithetical admission band media types
• Security and policy-based connectivity functions through admission lists or packet filters
The Amount Layer
The amount band of a campus arrangement provides connectivity of all administration band devices. The
core, sometimes referred to as the backbone, charge be able to about-face cartage as calmly as
possible. Amount accessories should accept the afterward attributes:
• Actual aerial throughput
• No accidental packet manipulations (access lists, packet filtering)
• No Band 3 processing, unless appropriate and actual fast
• Redundancy and resiliency for aerial availability