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Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 34 Configuring EtherChannels and Link-State Tracking
Understanding EtherChannels
You can create an EtherChannel on a standalone switch, on a single switch in the stack, or on multiple
switches in the stack (known as cross-stack EtherChannel). See
Figure 34-2
and
Figure 34-3
.
If a link within an EtherChannel fails, traffic previously carried over that failed link moves to the
remaining links within the EtherChannel. If traps are enabled on the switch, a trap is sent for a failure
that identifies the switch, the EtherChannel, and the failed link. Inbound broadcast and multicast packets
on one link in an EtherChannel are blocked from returning on any other link of the EtherChannel.
Figure 34-2
Single-Switch EtherChannel
Switch 1
Catalyst 3750 switch stack
Switch 2
Channel
group 1
Channel
group 2
StackWise
port
connections
Switch 3
Switch A
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