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.
using OSPF areas even without summarization is advatangeous because you partition the database:
detailed link state information is used and tracked only for intra area routes.
Inter Area routes are less detailed and being linked to the ABR they can be tracked/updated with partial recalculation (a full SPF execution should'nt be needed if a route in another area changes state, at least with PRC support in modern IOS images)
I think you can try to use the multiple area approach.
You can even think to use some form of stub area (the standard one that is stub area) to reduce the size of OSPF updates sent to remote routers.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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