"LoWPAN Routers with no ER available SHOULD set Prf to (00) for low
preference, LoWPAN Routers with ER availability SHOULD set Prf to
(01) for
normal preference, and LoWPAN Edge Routers SHOULD set Prf to (01)
for high
preference."
Make that:
"LoWPAN Routers with no ER available SHOULD set Prf to (11) for low
preference, LoWPAN Routers with ER availability SHOULD set Prf to
(00) for
normal preference, and LoWPAN Edge Routers SHOULD set Prf to (01)
for high
preference."
Prf is a two-bit signed (two's complement) field.
11 = -1.
00 = 0.
01 = 1.
(10 = 2. is reserved in RFC 4191 -- we could start to use it if
needed, though.)
I haven't thought through whether SHOULD is the right level of
requirement here.
(Intuitively, I'd say MUST, because I can imagine the protocol
seriously misbehaving without.)
(Maybe it would also be good to add a short note that, while the M and
O bits are available, they are not very useful in a 6LoWPAN.)
Gruesse, Carsten
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