  A reliable network is an absolute requirement for telecommunication networks
at this time. This is in line with the growing number of users who need a
reliable and uninterrupted connection to the server. Link Aggregation is one of
the techniques that can be used to provide a reliable network. Link Aggregation
System combines two or more links into one logical link, which is characterized
by the use of a single IP address. During the communication between host and
server, whenever the used link is broken or terminated the other active link
can act as redundancy to resume that communication. This mechanism is called
link redundancy. This mechanism will not run without the existence of another
mechanism that monitors the condition of the links, which is either connected
or disconnected. That mechanism is called link monitoring. Link monitoring used
in this simulation is the Media Independent Interface (MII). In this
simulation, we used Ryu-Controller and mininet Simulator to test the
reliability of Link Aggregation-based SDN (Software Defined Network). During
the simulation, we analyzed failover performance and how the Link Aggregation
distributes the connection across the links for every which comes from a
different source. From the simulations, we confirmed that link redundancy, the
same data rate for every connection, to some degree, worked as intended.
