Setting up a VyOS EC2 instance to connect two VPCs

VyOS on EC2

interfaces {
    vti vti0 {
        address <CGW_INTERNAL_IP_A>/30
        description "VPC Tunnel A"
        mtu 1436
    }
    vti vti1 {
        address <CGW_INTERNAL_IP_B>/30
        description "VPC Tunnel B"
        mtu 1436
    }
}
protocols {
    static {
        interface-route <VPC-B_CIDR> {
            next-hop-interface vti0 {
            }
            next-hop-interface vti1 {
            }
        }
    }
}
vpn {
    ipsec {
        esp-group AWS {
            compression disable
            lifetime 3600
            mode tunnel
            pfs enable
            proposal 1 {
                encryption aes128
                hash sha1
            }
        }
        ike-group AWS {
            dead-peer-detection {
                action restart
                interval 15
                timeout 30
            }
            lifetime 28800
            proposal 1 {
                dh-group 2
                encryption aes128
                hash sha1
            }
        }
        ipsec-interfaces {
            interface eth0
        }
        site-to-site {
            peer <AWS_ENDPOINT_A> {
                authentication {
                    mode pre-shared-secret
                    pre-shared-secret <SECRET_A>
                }
                connection-type initiate
                description "VPN Tunnel A"
                ike-group AWS
                local-address <CGW_PRIVATE_IP>
                vti {
                    bind vti0
                    esp-group AWS
                }
            }
            peer <AWS_ENDPOINT_B> {
                authentication {
                    mode pre-shared-secret
                    pre-shared-secret <SECRET_B>
                }
                connection-type initiate
                description "VPN Tunnel B"
                ike-group AWS
                local-address <CGW_PRIVATE_IP>
                vti {
                    bind vti1
                    esp-group AWS
                }
            }
        }
    }
}