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L2 DCI and Optimal Routing between Data Centers

Dilemma: If I provide a L2-Extended DCI solution within a traditional network architecture, how can I limit latency and ensure users at remote sites access compute resources at the correct data center?

For instance, if I have a single subnet stretched between DCs, the prefix would be advertised out both. If I have a server at the 2nd data center but the traffic comes ingress through the 1st, it would then have to route via the DCI and that produces a lot of latency, especially if the data centers are geographically disparate.

LISP doesn't appeal to me. What are some other solutions?

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Re: L2 DCI and Optimal Routing between Data Centers

Hi @JimBob03268 

Generally speaking, LISP is quite a good solution.

On the other hand, if you have VXLAN or ACI implemented, then you have the option to advertise host routes (/32). Basically, only the local DC active hosts will be advertised externally.

 

Stay safe,

Sergiu

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