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© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1
Chapter 3: Link
Aggregation
Scaling Networks

Presentation_ID 2© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 3
3.1 Link Aggregation Concepts
3.2 Link Aggregation Configuration
3.3 Summary

Chapter 3: Objectives
 Explain the operation of link aggregation in a switched LAN
environment.
 Describe EtherChannel technology.
 Configure link aggregation to improve performance on high-traffic
switch links.
 Configure link aggregation with EtherChannel.
 Verify and troubleshoot link aggregation with EtherChannel.

3.1 Link Aggregation Concepts

Link Aggregation
Introduction to Link Aggregation
 Link aggregation allows the creation of logical links made up of
several physical links.
 EtherChannel is a form of link aggregation used in switched
networks.

Link Aggregation
Advantages of EtherChannel
 Most configurations are done on the EtherChannel interface
ensuring consistency throughout links.
 Relies on existing switch ports – no need for upgrades.
 Load-balances between links on the same EtherChannnel.
 Creates an aggregation viewed as one logical link by STP.
 Provides redundancy because the overall link is viewed as one
logical connection. If one physical link within channel goes down,
this does not cause a change in the topology and does not require
STP recalculation.

EtherChannel Operation
Implementation Restrictions
 EtherChannel implemented by
grouping multiple physical ports
into one or more logical
EtherChannel links.
 Interface types cannot be mixed.
 EtherChannel provides full-duplex
bandwidth up to 800 Mb/s (Fast
EtherChannel) or 8 Gb/s (Gigabit
EtherChannel).
 EtherChannel can consist of up to
16 compatibly-configured Ethernet
ports.
 The Cisco IOS switch currently
supports six EtherChannels.

Port Aggregation Protocol (PAgP)

Link Aggregation Control Protocol (LACP)

3.2 Link Aggregation Configuration

Configuring EtherChannel
Configuration Guidelines
 EtherChannel must be supported.
 Speed and duplex must match.
 VLAN match – All interfaces are in the same VLAN.
 Range of VLAN – Same range on all interfaces.

Configuring EtherChannel
Configuring Interfaces

Verifying and Troubleshooting EtherChannel
Verifying EtherChannel
 show interface Port-channel – Displays the general status
of the EtherChannel interface.
 show etherchannel summary – Displays one line of
information per port channel.
 show etherchannel port-channel – Displays information
about a specific port channel interface.
 show interfaces etherchannel – Provides information
about the role of the interface in the EtherChannel.

Verifying and Troubleshooting EtherChannel
Troubleshooting EtherChannel

Chapter 3: Summary
This chapter described:
 EtherChannel and how to encompass both the PAgP-based and the
LACP-based link aggregation methods
 EtherChannel technologies and the various means available to
implement them
 The configuration, verification, and troubleshooting of EtherChannel

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