A company's network engineer is designing an active-passive connection to AWS from two on- premises data centers. The company has set up AWS Direct…

To establish an active-passive connection from AWS to on-premises data centers, you must influence the BGP path selection process on the AWS side. AWS Direct Connect allows the use of BGP community tags to set the local preference for advertised routes. A higher local preference value is more preferred. The community tag 7224:7300 sets a high local preference, while 7224:7100 sets a low local preference. By tagging prefixes from the primary data center with 7224:7300 and from the failover data center with 7224:7100, you ensure that AWS directs traffic to the primary location as the active path and only uses the failover location when the primary path is unavailable.

A. This configuration reverses the requirement, making the failover data center the preferred (active) path and the primary data center the backup (passive) path.

C. The 7224:9xxx series of BGP community tags are used to control the scope of route propagation (e.g., local Region, continent), not for path preference.

D. The 7224:9xxx series of BGP community tags are used to control the scope of route propagation (e.g., local Region, continent), not for path preference.

1. AWS Direct Connect User Guide. (2024). Routing policies and BGP communities. AWS Documentation.

Section: Local preference for BGP communities.

Content: The documentation explicitly states: "We support the BGP local preference community tag to control the route preference of traffic from your AWS network. ... You can apply community tags to the prefixes that you advertise to us to indicate the priority of the corresponding path for returning traffic. The following BGP community tags are supported: 7224:7100–Low preference, 7224:7200–Medium preference, 7224:7300–High preference". This directly supports using 7224:7300 for the primary path and 7224:7100 for the failover path.

2. AWS Direct Connect User Guide. (2024). Routing policies and BGP communities. AWS Documentation.

Section: Route advertisement and BGP communities.

Content: This section details the 7224:9xxx communities, stating: "The following BGP communities can be applied to advertised prefixes to control the scope... 7224:9100–Local AWS Region, 7224:9200–All AWS Regions in a continent... 7224:9300–Global". This confirms that options C and D use tags for a different purpose (route propagation scope) than required by the question (path preference).