[Mipshop] LLA in FBUs

Hello all,

Section 6.2.1 - HI msg fmt (page 23)
draft-ietf-mipshop-fast-mipv6-03.txt says

	The link-layer address of the MN that is
         undergoing handover to the destination (i.e., NAR).
         This option MUST be included so that the destination
         can recognize the MN.

The thing is that when sending a HI the PAR is not necessarily aware of
MN's address.

Ideally (at least according to us here ) a PAR would learn an MN's L2
addr from the FBU. Yet Section 6.3.1. does not mention anything about
including an MH LLA Option. Without such an option we could try and
extract the L2 addr from FBUs L2 packet (which is a bit dirty -
implementation wise) but this would only work for predictive handovers
and there will be no way to do it with an FBU coming from the NAR.

Another way to get MN's L2 addr would be to use the one that arrived
with the RtSolPr and was recorded in the neighbor cache. Yet there is no
guarantee that it will still be there, not to mention the fact that it
might have not been in the RtSolPr in the first place.

So in other words - wouldn't it be better if we had a MUST MH LLA option
for FBUs?

Cheers
Emil

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