Re: [mpls] Available IP version numbers.

a) Any more insight into the reserved numbers ?
   If there are failed experiments (i think there might have been ?)
   That would be good to review to avoid similar errors.

b) I would not be concerned about exhaustion if we come up with one proposal
   that gives us good confidence of extensibility. 

c) Any backward compatibility reason for us not being able to use 8
   bits - out of which the first 4 bits of course can only use unassigned
   values.

Cheers
    Toerless

On Sat, Apr 17, 2021 at 04:13:23PM +0800, Loa Andersson wrote:
> DT,
> 
> We had a discussion on how many IP version numbers are available. 
> 
> It should be remembered that in IANA ???Reserved??? really means ???Reserved, do not assign???. 
> 
> 0,1,5,7,8,9 and 15 are reserved. 
> 2,3,10,11,12,13 and 14 are unassigned
> 4 and 6 are assigned 
> 
> To make the reserved requires a standard track RFC. 
> 
> So we 7 IP version numbers available, that is a sufficient low number to make me nervous, if I owned the registry. 
> 
> I would nit count on having more IP version numbers assigned to ???us???, especially since we already have an agreement (PWE3), accepting to get two numbers and committing to not use more. 
> 
> /Loa
> 
> Sent from my iPhone
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