Re: int-serv over e.g. ATM

[Juha Heinanen <[e-mail]>]

yes, i know that rsvp doesn't require a router on the path.

    > by the way, if there are several routers on the path, how can the source
    > be sure that the routers all support rsvp?  does rsvp routing protocol
    > provide information about the whole path to the source?
    > -- juha

   This is again a non-problem, at least architecturally.  The
   link going toward a portion of the Internet which doesn't
   have rsvp can only carry best-effort traffic.  It's like
   connecting TM4.0 capable ATM switches to UNI3.1 switches.
   You just don't have ABR capability available on that path.

yes, but if the rsvp routing protocol can't tell to the host that there
is an rsvp capable path all the way to the destination, the source has
to probe it by trying to make an rsvp reservation, which is equivalent
to sending an nbma arp.  so, it would make sense also in this case to
apply the rule "shortcut always if you can and route if you can't".

i have to read yakov's draft and see how it relates to this.

-- juha