From: Carsten Bormann <[email protected]>
Date: Thu, 11 Jun 2009 00:20:48 +0200
Cc: [email protected]
> In section 7.7, if TID1 is equal to TID2 are the two
> consistent? In other words does zero count as a small
> increment/decrement?
You are right that the text is not explicit about that.
> If receiving the same TID twice is treated as an OII
> collision, what mechanisms are there for detecting
> duplicate packets?
Good point.
The TID value could be split into two fields, a counter that
is managed as now and a random bit string indexed by the
counter. When incrementing the counter a host would also
append a new random bit to the end of the string. Only the
N most recent bits would be stored and included in the TID.
If two received TIDs have the same or nearly the same
counter the overlapping portions of the bitstrings would
have to agree. Even a one-bit overlap would detect a
collision half of the time.
This would allow an ER to detect collisions between hosts
whose TID counters happen to synchronize. Duplicated
packets would not cause false detections.
Does that make sense?
-Richard Kelsey
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