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**To modify a reference to a prefix list**
The following ``modify-transit-gateway-prefix-list-reference`` example modifies the prefix list reference in the specified route table by changing the attachment to which traffic is routed. ::
aws ec2 modify-transit-gateway-prefix-list-reference \
--transit-gateway-route-table-id tgw-rtb-0123456789abcd123 \
--prefix-list-id pl-11111122222222333 \
--transit-gateway-attachment-id tgw-attach-aabbccddaabbccaab
Output::
{
"TransitGatewayPrefixListReference": {
"TransitGatewayRouteTableId": "tgw-rtb-0123456789abcd123",
"PrefixListId": "pl-11111122222222333",
"PrefixListOwnerId": "123456789012",
"State": "modifying",
"Blackhole": false,
"TransitGatewayAttachment": {
"TransitGatewayAttachmentId": "tgw-attach-aabbccddaabbccaab",
"ResourceType": "vpc",
"ResourceId": "vpc-112233445566aabbc"
}
}
}
For more information, see `Prefix list references <https://docs.aws.amazon.com/vpc/latest/tgw/create-prefix-list-reference.html>`__ in the *Transit Gateways Guide*.