Re: [OSPF] OSPF NBMA interface type

Hey Russ,

On Jul 6, 2013, at 8:35 AM, Russ White wrote:

> 
>> With the convergence to ethernet everywhere, there is much less of a
>> requirement for other OSPF topologies. However, P2MP is still very
> relevant
>> in wireless and we now have the hybrid interface (RFC 6845). With Ericsson
>> IPOS, we also use P2MP for subscriber OSPF adjacencies where a single
>> interface can support many subscribers each with some form of explicit or
>> implied encap for demuxing each individual subscriber.
>> 
>> I don't see much requirement for NBMA but I'm sure there are deployments
>> making use of it.
> 
> I would be opposed to removing it, even if I can't find many specific
> instances of it being used (although MANET is a major use case)

OSPF MANET is has its own interface type (or should I say types since we have multiple experimental RFCs). They are all closer to P2MP than NBMA. 

> --unless we
> could find some specific reason to remove it (i.e., improvements in
> performance, reduced complexity that directly impacts the operation of
> neighbor formation, etc.). 

There is a lot machinery to support NBMA adjacency formation and polling. If we were ever to do OSPFv4, I think it would be on the table for deprecation. 

Thanks,
Acee

> 
> Russ
> 
> 
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