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

[Bernard Aboba <aboba@internaut.com>]

Erik Nordmark wisely observed:

> I think it would be good if the definitions would clarify that even if
> the link layer on the host sees 100% packet loss for a short while, it
> doesn't necessarily imply that a link down event should be generated.
> (It presumably shouldn't be generated until the link layer abandons the
> L2 association/connection/whatever.)

How about this?

Link Down
An event provided by the link layer that signifies a state change
associated with the interface no longer being capable of
communicating IP packets. A Link Down event
is only generated once the link layer considers the link
unusable; transient periods of high frame loss are not
sufficient.

Link Up
An event provided by the link layer that signifies a state change
associated with the interface becoming capable of communicating
IP packets.