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CHAPTER
37-1
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
37
Configuring EtherChannels and Link-State
Tracking
This chapter describes how to configure EtherChannels on Layer 2 and Layer 3 ports on the
Catalyst 3750-E or 3560-E 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. This chapter also describes how to configure link-state tracking.
Unless otherwise noted, the term switch refers to a Catalyst 3750-E or 3560-E standalone switch and to
a Catalyst 3750-E switch stack.
Note For complete syntax and usage information for the commands used in this chapter, see the command
reference for this release.
This chapter consists of these sections:
• Understanding EtherChannels, page 37-1
• Configuring EtherChannels, page 37-11
• Displaying EtherChannel, PAgP, and LACP Status, page 37-23
• Understanding Link-State Tracking, page 37-23
• Configuring Link-State Tracking, page 37-25
Understanding EtherChannels
These sections describe how EtherChannels work:
• EtherChannel Overview, page 37-2
• Port-Channel Interfaces, page 37-4
• Port Aggregation Protocol, page 37-5
• Link Aggregation Control Protocol, page 37-7
• EtherChannel On Mode, page 37-8