Re: RE: AD request / L2 Triggers Chapter Statement

> But what if the link layer and the IP layer are in separate systems? What
if the link layer in one
> system wants to send notifications to the IP layer in another system? For
example, is it possible
> for an AP to send a notification to a mobile node or an access router? I
think this kind of ability
> is useful. We found some technical problem can be solved more easily with
L2 and L3
> cooperation.

Precisely. 802.11 is an example where wireless L2 (access point) does not
have to
reside on the access router. Therefore, wireless L2 might be aware of
certain
events (link up, link down) per client, but communicating this to the
interested
party (i.e., access router) requires a protocol between two.

We have laid out the need for this type of information on the access router
in http://yegin.org/ietf/draft-manyfolks-l2-mobilereq-01.txt. Any system
that
separates the access point from access router would need a transport
for carrying link-layer event information. Similarly on the client side, if
wireless
client (e.g., laptop) is separated from wireless access device (e.g., cell
phone)...
I'm currently working on drafting such a protocol.

alper



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