MPLS, FlexVPN, and Multiple Data Centers

[jjhartma]

I have 2 data centers with 2 MPLS providers and recently upgraded to 2 ASR1k routers each.  The ASRs are currently connected one to each provider and we're running DMVPN over each MPLS.  Both data centers are configured as a hub on each DMVPN cloud.  One MPLS is our primary and the other is a backup.  The primary MPLS is a much larger pipe.

I'm considering moving to FlexVPN (IKEv2, AES GCM).  I'm also thinking of connecting both ASRs at each site to both MPLS circuits and configuring all 4 routers as hubs.  Before the ASRs we had ISR4k's and got bitten by the clock bug last year on our primary MPLS at our primary datacenter.  It was... inconvenient, so I'm looking to avoid single points of failure as much as possible. 

Is this design feasible?  Is there anything else I should be considering before I start working on the plan?

We're currently using OSPF over the whole network (including the DMVPN), but my research is telling me that BGP seems to be the perferred protocol over the FlexVPN.  We currently BGP peer with the MPLS providers, but don't inject LAN routes into the MPLS.   Should I switch to BGP, and if so how could I go about using BGP for both the MPLS and the FlexVPN, but keeping the LAN routes out of the MPLS?

[balaji.bandi]

As long as you have good resource and more expertise to manage, you can choose any protocol.

Depends on how many sites you have, by default Cisco recommend to use EiGRP, Most of them use  OSPF for inter compatability with other vendor. if you have large deployment consider using BGP.(again depends on how you design)

BB

[jjhartma]

Thanks, that helps.  Right now we're pretty small.  Two data centers and two satellite offices.  We plan on adding another site in the next year and possibly connecting Azure into our MPLS as well.  I'm just trying to plan for future growth and want to make adding new sites simple.

[balaji.bandi]

You need to consider the design atleast for next 5 years and growing plan of Organisation and design

let me know if that helps you.

BB