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TGW does support Jumbo MTU (although at 8500) for all attachments except VPN. See below link: https://docs.aws.amazon.com/vpc/latest/tgw/what-is-transit-gateway.html
"Transit Gateway Maximum Transmission Unit (MTU) — The maximum transmission unit (MTU) of a network connection is the size, in bytes, of the largest permissible packet that can be passed over the connection. The larger the MTU of a connection, the more data can be passed in a single packet. A transit gateway supports an MTU of 8500 bytes for traffic between VPCs, Direct Connect and peering attachments. Traffic over VPN connections can have an MTU of 1500 bytes."
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