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* To protect the existing network
from the internet use by the new protocols during
testing phase in public network
* Overlay network creates a
virtual topology on top of existing physical topology.
* The above figure shows an
overlay network over a wide-area-network
* In an overlay network logical
links are used to connect all nodes.
* Here R3, R5, R7 and R2 routers
are used to form the overlay network designing with overlay logical links as
the interconnection links.
* Logical link is a path used to
connect two nodes in an overlay network
* Peer-to-peer network is an
example of an overlay network, which runs on top of internet
* Overlay network improve
internet routing by allowing the routing of messages to the destination without
knowing its IP address.
* Overlay networks are self
organized networks. Thus if a node fails in the overlay network algorithm
should provide solutions to recreate an appropriate network structure.
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