[MEXT] Clarifications required on BRI sequence number [draft-muhanna-mext-binding-revocation-02]

Kowsalya Subramanian <kowsalya@cisco.com> Fri, 30 January 2009 04:21 UTC

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Date: Fri, 30 Jan 2009 09:51:31 +0530
From: Kowsalya Subramanian <kowsalya@cisco.com>
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Subject: [MEXT] Clarifications required on BRI sequence number [draft-muhanna-mext-binding-revocation-02]
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Hi,
 
In the draft, there is text mentioning that the initiator of the BRI message
MUST choose a monotonically increasing sequence number. 
 
Lets consider a case where the BCE has 3 HNPs bound to it. If the LMA sends
a BRI with seq number 5 for {MN-ID, HNP1} and then wants to send a BRI for
{MN-ID, HNP2}. Should it wait till it gets a BRA for the previous BRI that
it sent? If LMA need not wait for the BRA, then it is possible that MAG
receives BRI 5, 6 out of order. In which case, what should the MAG do,
should it ignore BRI 5 as it has already got BRI 6.
 
In other words, is the sequence number in BRI indicates some form of
versioning for the deletion or is it just to match only BRA and identify BRI
re-transmissions. If it is the latter, why should it be monotonically
increasing, it can just be unique.
 
Am I missing something here?
 
Thanks
Kowsalya
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