> From: [email protected] [mailto:[email protected]] On Behalf
Of
> Acee Lindem
> Sent: Thursday, January 06, 2011 1:19 PM
...
Acee:
Happy New Year!!
> Speaking as WG Co-Chair,
>
> I think we are ready to ask whether or not we want to make this a WG
> document. If you feel one way or another, please share your opinion.
I'm going to say "no".
While I do believe that the definition of this type of hybrid interface
is interesting, the proposed solution has significant limitations
related to its application to "radio networks". It is constrained to a
specific case (not the general case). To quote Jeffrey form a prior
thread: "The premise is that we have a broadcast network but one can
reach some stations with a metric that is different from when reaching
others. If that premise is not satisfied, then it's a different topic
(and out of the scope)."
Also, an interface with similar characteristics has already been
defined, implemented and deployed in radio networks. Take a look at the
OSPF-MANET Interface definition in rfc5820 -- I'm quoting a little piece
of the text below. Note that the OSPF-MANET interface can satisfy the
premise above as well as other types of configurations.
Thanks!
Alvaro.
-------------------
3.1. OSPF-MANET Interface
Interfaces are defined as the connection between a router and one of
its attached networks [OSPF]. Four types of interfaces have been
defined and supported in [OSPF] and [OSPFv3]: broadcast, Non-
Broadcast Multi-Access (NBMA), point-to-point, and point-to-
multipoint.
The point-to-multipoint model has been chosen to represent MANET
interfaces. (The features designed in this document MAY be included
on other interface types as appropriate.) The MANET interface allows
the following:
o OSPF treats all router-to-router connections over the MANET
interface as if they were point-to-point links.
o Link metric can be set on a per-neighbor basis.
o Broadcast and multicast can be accomplished through Layer 2
broadcast or Layer 2 pseudo-broadcast.
* The MANET interface supports Layer 2 broadcast if it is able to
address a single physical message to all of the attached
neighbors. One such example is 802.11.
* The MANET interface supports Layer 2 pseudo-broadcast if it is
able to pick up a packet from the broadcast queue, replicate
the packet, and send a copy over each point-to-point link. One
such example is Frame Relay.
o An API must be provided for Layer 3 to determine the Layer 2
broadcast capability. Based on the return of the API, OSPF
classifies the MANET interfaces into the following three types:
MANET broadcast, MANET pseudo-broadcast, and MANET non-broadcast.
o Multicast SHOULD be used for OSPF packets. When the MANET
interface supports Layer 2 broadcast or pseudo-broadcast, the
multicast process is transparent to OSPF. Otherwise, OSPF MUST
replicate multicast packets by itself.
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