They are also not accurate for planning bandwidth
needed on access switches hosting typical user applications with high-bandwidth
consumption (for example, nonclient-server databases or multimedia ?¬‚ows to unicast
addresses). Using QoS end to end prioritizes the traf?¬?c that should be dropped in the
event of congestion.
44 Chapter 2: Medium-Sized Switched Network Construction
Figure 2-15 EtherChannel
EtherChannel technology provides bandwidth scalability in the campus by offering the
following aggregate bandwidth:
?– FastEthernet: Up to 800 Mbps
?– Gigabit Ethernet: Up to 8 Gbps
?– 10-Gigabit Ethernet: Up to 80 Gbps
Each of these connection speeds can vary in amounts equal to the speed of the links used
(100 Mbps, 1 Gbps, or 10 Gbps). Even in the most bandwidth-demanding situations,
EtherChannel technology helps aggregate traf?¬?c and keeps oversubscription to a minimum,
while providing effective link-resiliency mechanisms.
NOTE Due to the full duplex nature of EtherChannel links, documentation may
sometimes duple these numbers indicating the full potential of the link. For example, an
8-port FastEthernet channel operating at full duplex can pass up to 1.
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