Oh, good. Thanks Randy.

Possible to add a one liner to say, "Backward compatibility issues are
covered by Section 10.2 of [RFC2622]"?

A
-----Original Message-----
From: Randy Bush <[email protected]> 
Sent: 15 October 2025 19:11
To: Oliver Gasser <[email protected]>
Cc: Adrian Farrel <[email protected]>; [email protected];
[email protected]; [email protected];
[email protected]
Subject: Re: draft-ietf-opsawg-prefix-lengths-07 ietf last call Opsdir
review

hi adrian and oliver

>> - How will legacy implementations react on encountering the additional
>>   inetnum fields?

rfc2622 ยง10.2 describes "adding new attributes to existing classes,"
which is what adding ther prefixlen: attribute to inetnum: class does.
same hack as geofeed: attribute.

    10.2 Extensions by adding new attributes to existing classes

       New attributes can be added to any class.  To ensure full
       compatibility, new attributes should not contradict the semantics
       of the objects they are attached to.  Any tool that uses the IRR
       should be designed so that it ignores attributes that it doesn't
       understand.  Most existing tools adhere to this design principle.

randy

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