SDN (Software-Defined Networking) 23
detail most of the functions of OpenDaylight. Of course, there are
many other controllers – particularly Open Source ones – such as
OpenContrail, Flood Light, etc.
The uppermost layer represents the Cloud management systems. It
is roughly equivalent to the operating system on a computer. It
includes Open Stack, which was the system which was most favored
by the developers, but again, many other products exist, both open
source and proprietary.
The southbound interface is often known by the term OpenFlow.
OpenFlow is a signaling system between the infrastructure and the
controller. This protocol was designed by Nicira and has led to a de
facto standard from the ONF. OpenFlow transports information that
properly defines the stream in question to open, modify or close the
associated path. OpenFlow also determines the actions to be executed
in one direction or the other over the interface. Finally, OpenFlow
facilitates the feeding back of measurement information performed
over the different communication ports, so that the controller has a
very precise view of the network.
The northbound and southbound interfaces have been standardized
by the ONF, to facilitate compatibility between Cloud providers, the
control software and the physical and virtual infrastructure. Most
manufacturers conform to these standards to a greater or lesser degree,
depending on the interests in the range of hardware already operating.
Indeed, one of the objectives is to allow companies which have an
extensive range to be able to upgrade to the next generation of SDN
without having to purchase all new infrastructure. A transitional
period is needed, during which we may see one of two scenarios:
– the company adapts the environment of the SDN to its existing
infrastructure. This is possible because the software layer is normally
independent on the physical layer. The company’s machines must
receive one of the hypervisors compatible with the manufacturer’s
products. However, it is important to add to or update the
infrastructure so that it gains at least 10%, but preferably 20 or 30%,
to be able to handle numerous logical networks;
www.it-ebooks.info
detail most of the functions of OpenDaylight. Of course, there are
many other controllers – particularly Open Source ones – such as
OpenContrail, Flood Light, etc.
The uppermost layer represents the Cloud management systems. It
is roughly equivalent to the operating system on a computer. It
includes Open Stack, which was the system which was most favored
by the developers, but again, many other products exist, both open
source and proprietary.
The southbound interface is often known by the term OpenFlow.
OpenFlow is a signaling system between the infrastructure and the
controller. This protocol was designed by Nicira and has led to a de
facto standard from the ONF. OpenFlow transports information that
properly defines the stream in question to open, modify or close the
associated path. OpenFlow also determines the actions to be executed
in one direction or the other over the interface. Finally, OpenFlow
facilitates the feeding back of measurement information performed
over the different communication ports, so that the controller has a
very precise view of the network.
The northbound and southbound interfaces have been standardized
by the ONF, to facilitate compatibility between Cloud providers, the
control software and the physical and virtual infrastructure. Most
manufacturers conform to these standards to a greater or lesser degree,
depending on the interests in the range of hardware already operating.
Indeed, one of the objectives is to allow companies which have an
extensive range to be able to upgrade to the next generation of SDN
without having to purchase all new infrastructure. A transitional
period is needed, during which we may see one of two scenarios:
– the company adapts the environment of the SDN to its existing
infrastructure. This is possible because the software layer is normally
independent on the physical layer. The company’s machines must
receive one of the hypervisors compatible with the manufacturer’s
products. However, it is important to add to or update the
infrastructure so that it gains at least 10%, but preferably 20 or 30%,
to be able to handle numerous logical networks;
www.it-ebooks.info