Netgear M4100-50-POE (FSM7250Pv1h1) - 48‐port FE + 2 GE Combo L2 Managed PoE Switch Administrator's Guide

Link aggregation allows the switch to treat multiple physical links between two endpoints as a 
single logical link. All the physical links in a given LAG must operate in full-duplex mode at the 
same speed. LAGs 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. 

Server

Subnet 3

Port 1/0/3
LAG_10

Port 1/0/2
LAG_10

Layer 3 Switch

Layer 2 Switch

Subnet 2

Subnet 3

Port 1/0/9
LAG_20

Port 1/0/8
LAG 20

LAGs offer 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 tenfold increase 
in bandwidth; LAG produces a two- or fivefold increase, useful if only a small increase is 
needed.