AWS's Capability in Handling Outbound Routing with Multiple AWS Direct Connect Connections
IHAC is using two AWS Direct Connect connections with different co-locations homing same AWS region. And they are wondering the way they could use we AWS 's capability in handling outbound routing. That is, they are expecting to achieve "Active-Active" or "Active-backup(passive)" -- for our outbound traffic -- between the two DX connections, by a few clicks on AWS console.
According to our document at https://docs.aws.amazon.com/directconnect/latest/UserGuide/routing-and-bgp.html : "If you have multiple AWS Direct Connect connections, you can adjust the load-sharing of inbound traffic by advertising prefixes with similar path attributes". So how?
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First, be aware of using common "internal" terms on re:Post. 'IHAC' is shorthand that most people won't know. For those people not in the know (i.e. everyone outside of AWS) it means "I Have A Customer". Consider rephrasing this more as a "how would a customer do...." - it's not a problem, more a way of expressing things in a way that more people can understand.
With that out of the way:
If the customer advertises identical prefixes (networks) to AWS across more than one path with equal cost then the traffic to those networks from AWS will be load balanced across those paths - delivering active/active network links.
Active/passive links can be achieved by advertising identical prefixes to AWS with different costs; or by advertising different prefixes (a mix of more or less specific). In that second case the network will choose the most specific prefixes first.
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In other words, there is no way on AWS console to change the behavior of this BGP conversation, right?
Correct. Path "preference" (that's an overloaded term here - not talking about BGP preferences) is determined by the prefix advertisement from the customer.