I have a question regarding design considerations. Can someone with personal experience please help me with this?
Lets say I have a centralized location that must connect to many remote sites - a hub and spoke kind of architecture. The hub will be located at the data center and the spokes around the metro area of a city. So, this is a very typical set up.
My question concerns the WAN technology to use to connect these sites.
I can use an FRF.8 ATM-to-Frame-Relay model.
I can use an MPLS solution.
I can use point-to-point circuits between each spoke and the hub.
I can use IPSec VPNs over public Internet connections.
This design is a greenfield situation, so there is nothing to work with.
What are the considerations I should make when choosing a WAN technology?
Which is typically the cheapest of all the solutions above?
If you had to choose a design, which would you choose?
What I think is a nice robust solution is to have dual hubs at the data center and dual edge routers at each spoke site.
-- Spoke router 1 will use an BGP MPLS VPN technology to connect to hub 1.
-- Spoke router 1 will have an iBGP peering with spoke router 2.
-- Spoke router 2 will use a BGP peering with hub router 2 over an IPSec tunnel as a back-up.
-- If spoke router 1's connection to the MPLS network fails, it will lose its primary route to the hub and fallback to its iBGP connection through spoke router 2, which will provide connjectivity back to the data center through its IPSec connection to hub router 2.
Can someone comment on the sanity, advantages/disadvantages of this proposed solution?