Trim the unrelated contents, to reflect the key confusion: According to the following responses, the newly defined u/up flag is optional, and they indicate the “the reason why the unreachability was advertised”Then, if only the “U”flag is attached, what’s the reason for the unreachability?If I am correct, you want to define a term like "the protocol specificway of specifying unreachability". Then you want to state early inthe document something like A router that implements UPA MUST attach the U-bit to any announcement that contains the protocol specific way of specifying unreachability. Conversely, any announcement with the U-bit MUST also include the protocol specific way of specifying unreachability.##PP Aijun Wang China Telecom |
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