Software Defined Network

[nivoberg83]

Can anyone inform me how to find the exact number of software defined network SDN controllers to be implemented in wireless sensor network environment.

p.s These controllers will be connected via Ethernet cable.

[Philip D'Ath]

There is not even slightly enough information to start answering your question.

[nivoberg83]

Im going to use sdn controller in wsn, where sensors are randomly deployed and their number ranges from 500 to 1500 sensors in  a given field size. The question is how to determine the exact number of sdn controllers for such network?  Some say that it should be odd number ( not one for reliability reasons) so at least three controllers , but Im not sure if it is applicable to any network size....

still confused

[Philip D'Ath · Accepted solution]

Your talking about APIC-EM.  In that case, for high availability, you need 3 nodes.

http://www.cisco.com/c/en/us/td/docs/cloud-systems-management/application-policy-infrastructure-controller-enterprise-module/1-0-x/deploy-guide/b_apic-em_deploy_guide_v_1_0_0_x/b_apic-em_deploy_guide_v_1_0_0_x_chapter_0100.html

For high availability and scale, your multi-host deployment must contain three hosts.

[nivoberg83]

Thank you Philip

[Philip D'Ath · Accepted solution]

I haven't seen any documents about size of network versus number of controllers.  I imagine it will depend a lot on what the network is going (for example, iWAN or something else).

If it was me I would probably go for three nodes, like in the deployment guide.  This is likely to be a well tested scenario by Cisco.  Then if it was having trouble coping, beef up the hardware with more RAM and CPUs.

I just found these APIC-EM appliances you can buy, all ready to go:

http://www.cisco.com/c/en/us/td/docs/cloud-systems-management/application-policy-infrastructure-controller-enterprise-module/1-1-x/hardware-guide/b_apic-em_hardware_install/b_apic-em_hrd_install_chapter_010.pdf

It gives these specs for a "large Network"; 2 physical CPUs; 128B of RAM; 3.4TB of disk and 2 Gigabit NICs.  You would have to think that three of these would be a well tested scenario.