VPC Connection Conditions
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VNG CorporationTo 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:
| No. | Conditions | Error Code |
|---|---|---|
1 | The two VPCs from different regions must not have overlapping CIDR blocks. | Overlaping cidr each others (code 2009) |
2 | Connecting two VPCs that already have an existing connection is not allowed. Even if creating a different Cross Connect, the connection cannot be established. | Existing a VPC Connect for this couple of VPCs (code 2010) |
3 | It is not allowed to create a VPC connection when a VPC in the Requester role has an existing connection with a VPC in the Accepter role that has overlapping CIDR blocks. | Existing a VPC Connection in Cross Connect opens from this CIDR (code 2011) |
4 | It is not allowed to create a VPC connection when a VPC in the Accepter role has an existing connection with a VPC in the Requester role that has overlapping CIDR blocks. | Existing a VPC Connection in Cross Connect opens to this CIDR (code 2013) |
5 | The two VPCs connected to each other must not be in the same region. | Not able to create VPC Connect in the same Region (code 2012) |
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.
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.
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.
