Cisco WS-C3550-12G Software Configuration Manual page 520
Multilayer switch
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Understanding EtherChannel
In
Figure
a single-MAC-address device, source-based forwarding on the switch EtherChannel ensures that the
switch uses all available bandwidth to the router. The router is configured for destination-based
forwarding because the large number of workstations ensures that the traffic is evenly distributed from
the router EtherChannel.
Use the option that provides the greatest variety in your configuration. For example, if the traffic on a
channel is going only to a single MAC address, using the destination-MAC address always chooses the
same link in the channel; using source addresses or IP addresses might result in better load balancing.
Figure 21-3 Load Distribution and Forwarding Methods
Catalyst 3550 Multilayer Switch Software Configuration Guide
21-6
21-3, an EtherChannel of four workstations communicates with a router. Because the router is
Catalyst 3550 switch
with source-based
forwarding enabled
EtherChannel
Cisco router
with destination-based
forwarding enabled
Chapter 21
Configuring EtherChannel
78-11194-03
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