Predictable Arrangement Model
Ideally, a arrangement needs to be advised with a anticipated behavior in apperception to action low
maintenance and aerial availability. For example, a campus arrangement needs to balance from
failures and cartography changes bound and in a agreed manner. The arrangement should be
scalable to calmly abutment approaching expansions and upgrades. With a advanced array of multiprotocol
and multicast traffic, the arrangement should be able to abutment the 20/80 aphorism from a traffic
standpoint. In added words, the arrangement should be advised about cartage flows instead of a
particular blazon of traffic.
Traffic flows in a campus arrangement can be classified as three types, based on area the network
service is amid in affiliation to the end user. Table 2-3 lists these types forth with the admeasurement of
the campus arrangement that is crossed.
The agreement admission layer, administration layer, and amount band are anniversary audible apparatus of the
hierarchical arrangement architecture model. The arrangement is disconnected into analytic levels or layers,
according to function. These agreement and the hierarchical arrangement architecture are discussed in the next
section.
Types of Arrangement Services
Service Blazon Location of Service Admeasurement 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