There are really two issues:
1/ the need for a unique node ID
2/ an engineering judgment call of whether one could borrow MAC
address
to serve the above purpose.
(this is similar to the existing TCP design of borrowing IP
address as part of TCP's connection ID)
2/ represents an engineering tradeoff because the borrowing saves
the trouble of managing another new ID space.
Right. In addition, and perhaps more importantly, borrowing also
saves the managing and securing of a mapping between the lower-layer
ID and the upper-layer ID.
- Christian
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