The AWS environment should be configured as in the following diagram:

Add the following routes to the route table for VPC B or the subnet that contains the client instance:

Destination Address
Target
VPC A CIDR Block AWS Transit Gateway B
Virtual IP Address AWS Transit Gateway B

Add the following routes to the route table for AWS Transit Gateway B:

CIDR
Choose Attachment
VPC A CIDR Block AWS Transit Gateway Inter-Region Peering Attachment
Virtual IP address AWS Transit Gateway Inter-Region Peering Attachment

Add the following routes to the route table for AWS Transit Gateway A:

CIDR
Choose Attachment
VPC B CIDR Block AWS Transit Gateway Inter-Region Peering Attachment
Virtual IP address AWS Transit Gateway Attachment A

Add the following route to the route table for VPC A or the subnets that contain the LifeKeeper instances:

Destination Address
Target
VPC B CIDR Block AWS Transit Gateway A

Once configured, make sure that the client can access the private address of each server in the high-availability cluster as well as the virtual IP address.

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