Network diagram is attached. Please help me in deciding routing best for this situation. There is main Head office and every branch office is connecting to this directly through VPN.
I would like to proceed with OSPF because of industry standard and devices involving multiple vendors. Which OSPF design would be best for this situation? The problem is that IP address allocated to Branch offices are not in symmetry.
So simply dividing the branch office into multiple areas based on their geographic locations doesn't look possible due to IP addresses allocation. I can't change the IP addresses in all offices.
If I go with just one area OSPF database size will be large as there are around 300 branch offices.
So help me to decide is Static routing a solution or still go with OSPF? Is there a way to control the ospf traffic other than areas?
One thing to mention each branch having dual links to the main site and each Service provider is providing dual links one primary and other backup.