Dear Noor Thamer Mahmood,
large SDNs can be set up in the form of hierarchical structures.
As the idea for this see
Fig. 9546: Two-tier hierarchical SDN architecture
and
Fig. 9548: Recursive hierarchical SDN architecture: a) general idea, b) implementation of handover in SD-IoV
under the addresses
https://www.researchgate.net/publication/341574902_SDN_Software_Defined_Networking/figures
Best regards
Anatol Badach
Open Networking Foundation: „ONF TR-521: SDN Architecture, Issue 1.1, April 2016
Hi
The purpose of the ace SDN is to exclude IP.
In this network, segments are used for routing; that's why there is a central controller that supervises; it becomes a central system; that's why the structure of the extensive SDN network suffers; it can be said that the SDN network is suitable for small networks.
SDN network is designed for small networks
need for a new network paradigm include:
1. Changing traffic patterns
2. The “consumerization of IT”
3. The rise of cloud services
4. “Big data” means more bandwidth
I suggest looking at this recently published paper on the experiences of rolling out an SDN network and then having to redefine and deploy and new architecture. Some key things you have to look out for is the amount of automation you need the direction and quantity of traffic flows. Changes in traffic flow necessitated a change in the SDN implementation.
https://www.intel.com/content/www/us/en/it-management/intel-it-best-practices/scaling-intel-datacenters-paper.html
it's interesting to contrast this with the initial experience paper from years ago:
ttps://www.intel.com/content/dam/www/central-libraries/us/en/documents/enterprise-adopting-software-defined-networking-paper.pdf
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