iSCSI ExpStatSN, StatSN question

I would like help interpreting the following paragraph from iSCSI RFC 3720, 
Section 3.2.2.2:

     "A large absolute difference between StatSN and ExpStatSN may indicate
     a failed connection.  Initiators MUST undertake recovery actions if the 
     difference is greater than an implementation defined constant that MUST NOT
     exceed 2**31-1."

I don't understand what is meant by "absolute difference"... For the purposes of 
this discussion, assume the "implementation defined constant" to be 2**31-1, 
which is the largest allowed value... regardless of whether you consider this a
"reasonable" choice for the constant.

In this case, which of the following would require recovery actions, and why?

a) ExpStatSn=FFFFFFFFh, and initiator receives StatSn=0. (i.e., missing one StatSN)

b) ExpStatSn=0, and initiator receives StatSn=FFFFFFFFh. (i.e., duplicate StatSN)

c) ExpStatSn=0, and initiator receives StatSn=7FFFFFFFh. (i.e., missing lots of StatSNs)

d) ExpStatSn=0, and initiator receives StatSn=80000000h. (missing or duplicate?)

e) ExpStatSn=0, and initiator receives StatSn=80000001h. (i.e., very old duplicate StatSN)


thanks,

Dean Scoville

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