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Transport network between ACI On-Prem and Cloud ACI in AWS

The reason of this post is I am confused by Cisco documents regarding the architecture of the transport network between ACI on-prem DC and ACI Cloud in AWS. Let me explain:

 

1. From ACI in AWS whitepaper here: https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-741998.html#Intersiteconnectivity

The description is very brief but the diagram clearly shows either the IPSec tunnel OR directconnect transport should be connected to the spine switch in on-prem DC. I understand this connection between Spine and customer routing device would be configured L3Out.

 

2. From CiscoLive session PSODCN-2557, slide#28, it shows the transport is connected to the border leaf as L3Out specifically for the DirectConnect option... https://www.ciscolive.com/global/on-demand-library.html?search.event=ciscoliveus2019&search.event=ciscoliveanz2019&search.event=ciscolivelatam2019&search.event=ciscoliveemea2019&search=PSODCN-2557#/session/1552944518476001XKHw

 

3. The same inconsistency continues in Ciscolive session BRKACI-2690, slide#46-47..https://www.ciscolive.com/global/on-demand-library.html?search.event=ciscoliveus2019&search.event=ciscoliveanz2019&search.event=ciscolivelatam2019&search.event=ciscoliveemea2019&search=BRKACI-2690#/session/1542224297262001rxGz

 

I just hope someone can provide a clear answer regarding the architecture regarding the connection of the transport (IPSec or DX) in on-prem DC to AWS... Not looking for how to configure it.

 

Thanks!

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