[OSPF] OSPFv2 operation on broadcast media with "slacked"/"discontinuous" IP addressing

[David Lamparter <[e-mail]>]

Hi,


out of a rather funny misunderstanding of RFC 5309, I've ended up with
half an implementation of OSPF running in ignorance of the IP subnet
mask on a broadcast network.  After cleaning up the misunderstanding and
taking a step back, I found draft-ietf-ospf-hybrid-bcast-and-p2mp, which
I expected to contain a note about this, but no such thing.

The general idea would be to operate a broadcast medium with a /32
subnet mask, possibly unnumbered, and allowing adjacencies with just
about anything that sends a Hello (and passes auth).

The link can operate as regular broadcast, hybrid-bcast-p2mp, or P-t-P
(the last would amount to RFC 5309 with the detail that the peer address
is not known up front.)

(For OSPFv3, this is obviously not interesting since with link-local
addresses, there is no notion of similar same-subnet restrictions.)

I haven't found anything on this - is this mode of operation already
described somewhere?


Cheers,

David