Re: [DNA] Definition of "Link Up" and "Link Down" events?

[Bernard Aboba <aboba@internaut.com>]

> "An event provided by the link layer that signifies a state change
> associated with the interface no longer being capable of communicating IP
> packets. transient periods of high frame loss are not sufficient." enough
> for Link down definition?

The above is ok from my point of view.

> jak>> I guess I don't understand the problem. The definition leaves it up to
> the link layer to decide what "unusable" means. Whether or not that involves
> a state machine change or some other consideration is pretty much up to the
> link layer to decide.

I think Erik's point was that we don't want a "Link Down" to be sent just
because a few frames were lost.  While that might initiate a search for a
new point of attachment, the problem might be highly transient.  Where
there is multi-link interference, for example, we see the S/N ratio drop
20-30 dB within a very short distance.