> On Dec 30, 2023, at 06:56, tom petch <[email protected]> wrote:
> 
> Going through ospf-sr-yang-25 (and no, I do not want a new version for 
> Christmas!) it seems to me that RFC8666 updates, RFC8665 even if the metadata 
> does not mention it.
> 
> RFC8665 says 
> "      AF:  Address family for the prefix.  Currently, the only supported
>         value is 0 for IPv4 unicast.  The inclusion of address family
>         in this TLV allows for future extension.
> "
> 
> while RFC8666 says 
> "      AF:  Address family for the prefix.
>         AF:  0 - IPv4 unicast
>         AF:  1 - IPv6 unicast
> "
> Since 8665 says 'only supported value' then this is  no longer valid and has 
> a knock-on efffect when it comes to ospf-sr-yang.

OSPFv2 only supports IPv4. 
OSPFv3 supports both IPv4 and IPv6. 

Thanks,
Acee



> 
> If 8665 set up a registry (which I appreciate that the LSR WG has been 
> resistant to doing in other cases) then adding a value to the registry would 
> not be an update as per previous AD decisions but the phrase 'the only 
> supported value is 0' can mislead until the reader understands 8666 (and may 
> still do so).
> 
> Note that ospf-sr-yang has both RFC8665 and RFC8666 as Normative References 
> so it is the implementor of the yang module that is at risk of 
> misunderstanding.
> 
> I have a number of comments on ospf-sr-yang relating to this which I will 
> post separately.
> 
> Tom Petch

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