Re: RE: AD request / L2 Triggers Chapter Statement

Hi

Few will doubt that it is useful for the link layer to be able to send event notifications up to IP 
layer, especially for fast handover in wireless environment. And if the link layer and the IP layer 
reside in one system, we can implement the system to send suitable information upward. 

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. 

This is an example. When a mobile node changes its point of attachment, it should find its new 
access router as soon as possible. But there are some problem under current neighbor 
discovery protocol. For more detail, confer 'Mobility Support in IPv6 (draft-ietf-mobileip-ipv6-
17.txt)' 7.5 and 'IPv6 Fast Router Advertisement (draft-mkhalil-ipv6-fastra-00.txt)'. Because 
of these, the standard (RFC 2461) change is suggested. But we can solve these problems more 
easily if an AP caches suitable Router Advertisement message and sends it to an arriving mobile 
node. For more detail, confer 'Fast Router Discovery with AP Notification (draft-jinchoi-
l2trigger-fastrd-00.txt)'. 

We believe that the above is not sole example. Moreover it will be nice for other standard body 
(IEEE 802.11) to nofify them what kinds of triggers are needed to optimize IP 
performance. Did IETF provide input for 3GPP? 

I guess the following questions are to be considered.
1) Is L2 trigger useful for Internet? 
2) Can we improve the current work on L2 trigger?
3) Is it appropriate to work on L2 trigger in IETF WG?

IMHO, the answers to all are positive as I wrote above.

JinHyeock


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