Hi All,
what is SDN? My understanding as follows.
Traditional routers have their control plane and data plane are coupled
together and will be used for communication. Control plane is brain for
making decisions and data-plane is carrier/forwarder to transfer the
packets. These 2 planes reside in the same hardware. Data-plane uses some
powerful asics/processors for forwarding, but control plane is a software
which decides the best entries to be inserted into routing table. With SDN,
these 2 planes are divided into separate machines. There will be a control
plane (server) who receives the messages from clients(control/data-plane)
and processes.

Since quagga is control plane software which can act as Server and
processes the messages. Please throw some pointers and
uses/advantages/disadvantages about integration quagga for SDN.

My most of the statements may be wrong, please correct if necessary.

Regards,
Srujan
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