VPC Connection Conditions
To enable communication between two regions via Cross Connect, it is necessary to configure the connection between two VPCs. For a successful connection between the two VPCs, certain conditions must be met; otherwise, the system will display an error and not allow the connection to be established.
The conditions for two VPCs to connect are:
Example of error codes when creating a VPC connection:
[Error Code 2010] An existing VPC connection pair already exists.
From the diagram, we can see that:
At time T, the user can successfully create a connection from HCM-VPC01 to HAN-VPC01 between the two regions via Cross Connect 1.
At time T+1, the system no longer allows the creation of a connection between HCM-VPC01 and HAN-VPC01, as this connection was previously established in the same Cross Connect.
Creating a connection pair between HCM-VPC01 and HAN-VPC01 in a different Cross Connect at a later time (T+2) is also not possible, as the system will check whether the VPC pair already exists in another Cross Connect.
[Error Code 2011] Overlapping CIDR of a VPC connection in the Cross Connect at the Requester.
From the diagram, we can see that:
At time T, the user can successfully create a connection from HCM-VPC02 to HAN-VPC01 between the two regions via Cross Connect 1.
At time T+1, the system does not allow the creation of a connection from HCM-VPC03 to HAN-VPC03, due to the CIDR block 10.15.0.0/16 of HCM-VPC02 (which was previously connected to HAN-VPC01) overlapping with the CIDR of HAN-VPC03 that HCM-VPC03 is attempting to connect to.
[Error Code 2013] Overlapping CIDR of a VPC connection in the Cross Connect at the Accepter.
From the diagram, we can see that:
At time T, the user can successfully create a connection from HCM-VPC01 to HAN-VPC02 between the two regions via Cross Connect 1.
At time T+1, the system does not allow the creation of a connection from HCM-VPC03 to HAN-VPC03, because the CIDR block 10.14.0.0/16 of HAN-VPC02 (which was previously connected to HCM-VPC01) overlaps with the CIDR of HCM-VPC03 that is attempting to connect to HAN-VPC03.
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