Departmental Switch Block 1
EtherChannel
100 Mbps 10 Mbps
1 Gbps ??“100 Mbps
Copper
Fiber 10 Gbps
1 Gbps
Server Farm
42 Chapter 2: Medium-Sized Switched Network Construction
?– EtherChannel: This feature provides link aggregation of bandwidth over Layer 2
links between two switches. EtherChannel bundles individual Ethernet ports into a
single logical port or link. All interfaces in each EtherChannel bundle must be
con?¬?gured with similar speed, duplex, and VLAN membership.
Determining Equipment and Cabling Needs
The design of any high-performance network has four objectives: security, availability,
scalability, and manageability. This list describes the equipment and cabling decisions that
you should consider when altering the infrastructure:
?– Replace hubs and legacy switches with new switches at the building access layer.
Select equipment with the appropriate port density at the access layer to support the
current user base while preparing for growth. Some designers begin by planning for
about 30 percent growth. If the budget allows, use modular access switches to
accommodate future expansion. Consider planning for the support of inline power and
QoS if you think you might implement IP telephony in the future.
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