amazonSideAsn

A private Autonomous System Number (ASN) for the Amazon side of a BGP session. The range is 64512 to 65534 for 16-bit ASNs and 4200000000 to 4294967294 for 32-bit ASNs.

The modify ASN operation is not allowed on a transit gateway if it has the following attachments:

• Dynamic VPN

• Static VPN

• Direct Connect Gateway

• Connect

You must first delete all transit gateway attachments configured prior to modifying the ASN on the transit gateway.