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 specific
way of specifying unreachability". Then you want to state early in
the 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
advertisement of the prefix unreachability has been defined in the past and we
are not allowed to change it, as that would result in a backward compatibility
issue.
So we can not mandate any new-bit for signaling the unreachability. We are just
indicating with the optional new flags the reason why the unreachbaility was
advertised.
Aijun Wang
China Telecom
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