Dell PowerConnect

Cisco IOS/Cat OS

 

 

Link Aggregation

EtherChannel

Groups (LAGs)

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 5316M is interoperable with Cisco Ether Channel 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 5316M 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 5316M or the external switch could go undetected and thus can 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 examples shown below use the switches’ command line interfaces to configure the switches. See the Dell™ PowerConnect™ 5316M Command Line Interface (CLI) Guide for more detailed information. See the section “Port Channel Commands” for information on configuring LAGs via the CLI.

August 2005

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Dell Enterprise Product Group

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Dell 5316M manual Dell PowerConnect Cisco IOS/Cat OS

5316M specifications

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