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APRIL 2008

LINK AGGREGATION INTEROPERABILITY OF THE DELL POWERCONNECT 6200 SERIES SWITCH

INTRODUCTION

This paper describes how to configure the Dell™ PowerConnect™ 6200 Series Gigabit

Ethernet switch to interoperate and connect with Cisco IOS based switches when using

industry standard link aggregation groups (LAGs) that adhere to the IEE 802.3ad standard.

This paper discusses both static and dynamic LAGs. The PowerConnect 6200 Series switches

include the PC6224, PC6248, PC6224P, PC6248P, PC6224F, and M6220.

The table below shows some of the terms used to refer to LAGs in Dell and Cisco documenta-

tion. This paper will use the term LAG.

DELL POWERCONNECT CISCO IOS/CATOS

Link Aggregation Groups (LAGs)

EtherChannel

Fast EtherChannel (FEC)

Gigabit EtherChannel (GEC)

Port-channel Channeling

Channel-group Channel-group

The primary purpose of LAGs is to increase the overall bandwidth between two switches. This

is accomplished by effectively aggregating multiple ports together that act as a single, logical

connection between the two switches.

The IEEE 802.3ad standard-based link aggregation implemented on the PowerConnect 6200

Series switch is interoperable with Cisco EtherChannel using both static and dynamic

configuration (dynamic via LACP, not the Cisco proprietary PAgP). Dell is a member of the

University of New Hampshire Interoperability Lab, where all PowerConnect products are tested

to confirm interoperability with other Consortium members. Included in these tests is link

aggregation interoperability with other Consortium members. Additional information regarding

UNH’s link aggregation testing can be found at:

ftp://ftp.iol.unh.edu/pub/bfc/testsuites/la.io.test.suite.pdf

Link aggregation can be configured as either dynamic or static. Dynamic configuration is

supported using the IEEE 802.3ad standard, which is known as Link Aggregation Control

Protocol (LACP). Static configuration is used when connecting the Dell PowerConnect 6200

Series Gigabit Ethernet switch to an external Gigabit Ethernet switch that does not support

LACP. One advantage of LACP is that the protocol enables the Gigabit Ethernet switch to

confirm that the external switch is also configured for link aggregation. When using static

configuration, a cabling or configuration mistake involving the Dell PowerConnect 6200 Series

switch or the external switch could go undetected and thus cause undesirable network

behavior. Both static and dynamic LAGs (via LACP) can detect physical link failures within the

LAG and continue forwarding traffic through the other connected links within that same LAG.

LACP can also detect switch or port failures that do not result in loss of link. This provides a

more resilient LAG. Best practices suggest using dynamic link aggregation instead of static link

aggregation.

The configuration examples in this document use the command line interface (CLI) on each

switch. For more detailed information about the commands, see the Dell™ PowerConnect™

6200 Series CLI Reference Guide. The “Port Channel Commands” section contains

information about configuring LAGs by using the CLI.

If desired, any of the example configurations can be performed on the Dell PowerConnect

6200 Series switch by using the Web Based Interface (WBI) as well. See the

Dell PowerConnect 6200 Series User's Guide for a description of the Dell WBI. For information

about configuring LAGs by using the WBI, see the “Aggregating Ports” section in the

“Configuring Switching Information” chapter.

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