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**To modify a transit gateway**
The following ``modify-transit-gateway`` example modifies the specified transit gateway by enabling ECMP support for VPN attachments. ::
aws ec2 modify-transit-gateway \
--transit-gateway-id tgw-111111222222aaaaa \
--options VpnEcmpSupport=enable
Output::
{
"TransitGateway": {
"TransitGatewayId": "tgw-111111222222aaaaa",
"TransitGatewayArn": "64512",
"State": "modifying",
"OwnerId": "123456789012",
"CreationTime": "2020-04-30T08:41:37.000Z",
"Options": {
"AmazonSideAsn": 64512,
"AutoAcceptSharedAttachments": "disable",
"DefaultRouteTableAssociation": "enable",
"AssociationDefaultRouteTableId": "tgw-rtb-0123456789abcd123",
"DefaultRouteTablePropagation": "enable",
"PropagationDefaultRouteTableId": "tgw-rtb-0123456789abcd123",
"VpnEcmpSupport": "enable",
"DnsSupport": "enable"
}
}
}
For more information, see `Transit gateways <https://docs.aws.amazon.com/vpc/latest/tgw/tgw-transit-gateways.html>`__ in the *Transit Gateways Guide*.