A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : MultiGRIP: Quality of Service Aware Multicasting over
DiffServ
Author(s) : G. Bianchi et al.
Filename : draft-bianchi-qos-multicast-over-diffserv-00.txt
Pages : 19
Date : 2002-12-2
Efficient delivery of real-time multicast traffic imposes on the
underlying network infrastructure the burden of supporting Quality of
Service (QoS). This can be quite a complex issue in a Differentiated
Services (DiffServ) IP network, especially if multicast users are
allowed to dynamically join and leave the multicast tree. In fact, since
DiffServ lacks of explicit reservation states, i) a replicating node
cannot test whether a corresponding reservation exists on an output
link, and ii) upon a dynamic join of a QoS multicast user, the DiffServ
network lacks of control functions to verify whether resources are
available along the new path. In this document, we present a solution to
support dynamic multicast with QoS over a DiffServ network. Our solution
combines two ideas. First, resource availability along a new QoS path is
verified via a probe-based approach. Second, QoS is maintained by
marking replicated packets with a special DSCP value, before forwarding
them on the QoS path. We are fully aware that the possible application
of the principles described in this draft in the Internet raises many
issues, which we do not address. Our aim, then, is not proposing a
fully-fledged solution, but contributing to the on-going discussions in
the international arena on these matters, by means of what we may see
also as a problem statement document.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-bianchi-qos-multicast-over-diffserv-00.txt
To remove yourself from the IETF Announcement list, send a message to
ietf-announce-request with the word unsubscribe in the body of the message.
Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
"get draft-bianchi-qos-multicast-over-diffserv-00.txt".
A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
Internet-Drafts can also be obtained by e-mail.
Send a message to:
mailserv@ietf.org.
In the body type:
"FILE /internet-drafts/draft-bianchi-qos-multicast-over-diffserv-00.txt".
NOTE: The mail server at ietf.org can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e. documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
- <ftp://ftp.ietf.org/internet-drafts/draft-bianchi-qos-multicast-over-diffserv-00.txt>
-
