Re: [DNA] L2 link and L3 link

[Brett Pentland <brett.pentland@eng.monash.edu.au>]

Bernard Aboba wrote:
<snip>
> Both hosts are within the same broadcast domain, so I'm not clear why you
> say that the L2 link is different.  Or do you mean that the "point of
> attachment" is different?  If so, then both cases exhibit a change in the
> point of attachment.
<snip>

I think that this terminology is useful.  A "link" is as defined in 
rfc2461 - "a communication facility or medium over which nodes can 
communicate at the link layer".  This is equivalent to what I think 
JinHyeock refers to as an L3 link.

A "point of attachment" might be a particular access point in 802.11b 
(or even a specific VLAN via that access point) or a port on an Ethernet 
switch and covers that concept decscribed by what I think JinHyeock 
refers to as an L2 link.

Thus a link-layer hint might indicate an attachment point change that 
may or may not correspond to a link change.

Brett.