CHAPTER
33-1
Catalyst 3750 Switch Software Configuration Guide
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33
Configuring EtherChannels
This chapter describes how to configure EtherChannels on Layer 2 and Layer 3 ports on the
Catalyst 3750 switch. EtherChannel provides fault-tolerant high-speed links between switches, routers,
and servers. You can use it to increase the bandwidth between the wiring closets and the data center, and
you can deploy it anywhere in the network where bottlenecks are likely to occur. EtherChannel provides
automatic recovery for the loss of a link by redistributing the load across the remaining links. If a link
fails, EtherChannel redirects traffic from the failed link to the remaining links in the channel without
intervention. Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack.
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter consists of these sections:
• Understanding EtherChannels, page 33-1
• Configuring EtherChannels, page 33-10
• Displaying EtherChannel, PAgP, and LACP Status, page 33-23
Understanding EtherChannels
These sections describe how EtherChannels work:
• EtherChannel Overview, page 33-2
• Port-Channel Interfaces, page 33-4
• Port Aggregation Protocol, page 33-5
• Link Aggregation Control Protocol, page 33-6
• Load Balancing and Forwarding Methods, page 33-7
• EtherChannel and Switch Stacks, page 33-9
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