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Two Datacenters in different geographic regions

Hi.

I'm Victor and I need your help.

Please give me advise.

I have to place servers in to different datacenters for HA.

There will be cluster of Hyper-V nodes. One node in one DC and another in the second DC.

If connection to main DC or virtual machine in first node in this DC fails this virtual machine will startup in the second DC.

I have seen topology like this

http://www.cisco.com/en/US/solutions/collateral/ns340/ns517/ns224/ns949/ns304/ns975/data_center_interconnect_design_guide.pdf

on page 13.

DCs will be have L2 link between each other.

But in one DC I have one global IPs and in another DC I have different global IP for virtual machines.

We have many clients ~ 1000 and more. it won't be efficient to change IPs on all clients in case of failure on mail DC.

Do I need my own AS and BGP in this two DCs with my own IPs that will be connected by L2 link?

How can I do it without AS?

Can somebody suggest me something where I can find some answer on my question (literature, guides)?

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