Table of Contents
Advertisement
This chapter includes instructions for configuring Link Aggregation (LAG). The following examples are
provided:
•
"Create Two LAGs" on page 5-2
•
"Add the Ports to the LAGs" on page 5-3
•
"Enable Both LAGs" on page 5-5
Link Aggregation (LAG) allows the switch to treat multiple physical links between two end-points as a
single logical link. All the physical links in a given LAG must operate in full-duplex mode at the same
speed. LAG can be used to directly connect two switches when the traffic between them requires high
bandwidth and reliability, or to provide a higher bandwidth connection to a public network. Management
functions treat a LAG as if it were a single physical port. You can include a LAG in a VLAN. You can
configure more than one LAG for a given switch.
LAG offers the following benefits:
•
Increased reliability and availability—if one of the physical links in the LAG goes down, traffic is
dynamically and transparently reassigned to one of the other physical links.
•
Better use of physical resources—traffic can be load-balanced across the physical links.
•
Increased bandwidth—the aggregated physical links deliver higher bandwidth than each individual link.
•
Incremental increase in bandwidth—a physical upgrade could produce a 10-times increase in
bandwidth; LAG produces a two- or five-times increase, useful if only a small increase is needed.
v1.0, November 2008
Chapter 5
Link Aggregation
5-1
Advertisement
Table of Contents
