Which of the following statements about the MED BGP path attribute is FALSE?

The Multi-Exit Discriminator (MED) is an optional, non-transitive BGP path attribute, as defined in RFC 4271. Its purpose is to influence how a neighboring Autonomous System (AS) chooses an entry point into the local AS. Because it is non-transitive, a BGP speaker that receives a MED value from a peer does not advertise that MED to other peers in different ASes. The statement that MED is transitive is therefore false. All other statements are true: MED is optional, a lower value is preferred, and it is set by an edge router to influence inbound traffic.

B: MED is classified as an optional attribute in BGP; it is not required in BGP UPDATE messages. C: The BGP decision process prefers the path with the lowest MED value when comparing routes received from the same neighboring AS. D: MED is set by an Autonomous System Border Router (ASBR) to indicate a preferred entry point to a neighboring AS.

1. RFC 4271, "A Border Gateway Protocol 4 (BGP-4)", Section 5.1.4, Page 21. States: "MULTIEXITDISC (Type Code 4): This is an optional, non-transitive attribute...".

2. Nokia 7750 SR OS BGP Protocol Guide, Release 22.10.R1, "BGP path attributes" section. Describes MED as an "optional non-transitive" attribute.