> but you bring up allowing the router to ignore unknown pdu types if the
> version matches.  i.e. there can be new pdu types which do not have
> important semantics.  just so i can wrap my head, which is on first
> cuppa, around this, could you give me an example?  my first reaction is,
> if it has no important semantics, then why add it? :)

E.g.

If and when (;-)) we add origin validation for VPN routes and we do it by adding
a VPN prefix PDU.

> if a sender MUST only send unimportant unknown pdus, to enforce this,
> how does the recipient know if the unknown pdu type it just received is
> important or not?  i guess the sender can paint them grey. :)

By definition, if it's the same version#, all unknown PDUs are unimportant...
Otherwise, they are important ;-)

> but moving past this cloudy space, ...
> 
> how do we tell the iana that it can only add to the pdu type registry if
> the version is bumped?  or is it a registry of 
> 
>  version  pdu-type
>     0        0
>     0       1
>     ...
>     1       13
>     1      14
>     ...

This should work if it can be done!
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