Re: [quicwg/base-drafts] CID Lifetime Management (#1496)

[Nick Banks <[e-mail]>]

nibanks commented on this pull request.



> + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                         Sequence (i)                        ...
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+~~~
+
+The fields in the RETIRE_CONNECTION_ID frame are as follows:
+
+Sequence:
+: Sequence number of the oldest connection ID issued by the sender which the
+  sender will still recognize as associated with the current connection. The
+  sequence number is formatted as a variable-length integer.
+
+Upon receipt of a RETIRE_CONNECTION_ID frame, an endpoint MUST consider
+connection IDs older than the specified sequence number as unusable and MUST NOT
+consider the associated stateless reset tokens to be valid. If an older

I don't think older CIDs should be considered unusable. I can imagine a use for this to retire a CID that you used to try to probe a path that didn't work. In that case, you might still be using the older CID for your main path, and you just want to throw away the new one.

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