Understanding Etherchannels - Cisco Catalyst 3120 Software Manual

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Configuring EtherChannels and Link-State

This chapter describes how to configure EtherChannels on Layer 2 and Layer 3 ports on the 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 standalone switch and to a switch stack.

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

These sections describe how EtherChannels work:

Understanding EtherChannels, page 37-1

Configuring EtherChannels, page 37-10

Displaying EtherChannel, PAgP, and LACP Status, page 37-22

Understanding Link-State Tracking, page 37-22

Configuring Link-State Tracking, page 37-24

EtherChannel Overview, page 37-2

Port-Channel Interfaces, page 37-4

Port Aggregation Protocol, page 37-5

Link Aggregation Control Protocol, page 37-6

EtherChannel On Mode, page 37-7

Load-Balancing and Forwarding Methods, page 37-7

EtherChannel and Switch Stacks, page 37-9

C H A P T E R

Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide

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