[rbridge] Hop Count processing

[Joe Touch]

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James Carlson wrote:
> Radia Perlman writes:
>> Though, rereading that....I think it's even clearer if we remove the 
>> word "forwarding", so
>> it would instead be:
>>
>> "The Hop Count field is a 6-bit unsigned integer. An Rbridge
>> drops frames received with TTL=0, otherwise it decrements the TTL."
> 
> Much better.  The "forwarding" part is the qualifier most likely to
> confuse, and it doesn't actually change the meaning.

First, anyone who doesn't know what forwarding means is going to have a
lot of problems implementing an rbridge. There are things it does with
packets that terminate, and things it does with packets that forward.
Forwarding is just a step that happens after you check whether a packet
matches the addresses of the rbridge (and fails that match).

Second, there are many more complex things than forwarding in the spec
as well.

Third, it not only changes the meaning, it changes the behavior. See the
walkthrough in my previous mail.

Joe
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