# TransitGatewayRequestOptions
<a name="API_TransitGatewayRequestOptions"></a>

Describes the options for a transit gateway.

## Contents
<a name="API_TransitGatewayRequestOptions_Contents"></a>

 ** 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 default is `64512`.  
Type: Long  
Required: No

 ** AutoAcceptSharedAttachments **   
Enable or disable automatic acceptance of attachment requests. Disabled by default.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** DefaultRouteTableAssociation **   
Enable or disable automatic association with the default association route table. Enabled by default.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** DefaultRouteTablePropagation **   
Enable or disable automatic propagation of routes to the default propagation route table. Enabled by default.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** DnsSupport **   
Enable or disable DNS support. Enabled by default.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** MulticastSupport **   
Indicates whether multicast is enabled on the transit gateway  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** SecurityGroupReferencingSupport **   
Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.   
This option is disabled by default.  
For more information about security group referencing, see [Security group referencing](https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security) in the * AWS Transit Gateways Guide*.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** TransitGatewayCidrBlocks.N **   
One or more IPv4 or IPv6 CIDR blocks for the transit gateway. Must be a size /24 CIDR block or larger for IPv4, or a size /64 CIDR block or larger for IPv6.  
Type: Array of strings  
Required: No

 ** VpnEcmpSupport **   
Enable or disable Equal Cost Multipath Protocol support. Enabled by default.  
Type: String  
Valid Values: `enable | disable`   
Required: No

## See Also
<a name="API_TransitGatewayRequestOptions_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ec2-2016-11-15/TransitGatewayRequestOptions) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/TransitGatewayRequestOptions) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/TransitGatewayRequestOptions)