HELP NEEDED: Building a WAN with QoS guarantees.

"Kostas I. Karanassios - Network Manager" <Kostas.Karanassios@cti.gr> Tue, 14 February 1995 07:26 UTC

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From: "Kostas I. Karanassios - Network Manager" <Kostas.Karanassios@cti.gr>
Subject: HELP NEEDED: Building a WAN with QoS guarantees.
To: big-lan@suvm.acs.syr.edu, cisco@spot.colorado.edu, end2end-interest@isi.edu, ietf@CNRI.Reston.VA.US, rem-conf@es.net, xtp-relay@cs.concordia.edu
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Dear Networkers,

Apologies for the crossposting of this message to multiple newsgroups and
e-mail lists.
 
I would appreciate any kind of help (vendor/product info, references, 
experiences, etc) on the following problem: 

How to build a WAN with a broadcast/multicast functionality in order to connect
a Server-station with N x Client-stations/PCs (N>=400), via point-to-point
network connections (data rate >=19.2 Kbps), 

                                  _______      Client-station1 (PC)
    +----------------+           (       )   /
    | Server-station |----------(   WAN   )  -- Client-station2 (PC)
    +----------------+           (       )   \    .
                                  -------     \   .
                                                  .
                                                Client-stationN (PC)
                                                 
so that: the broadcast/multicast capability of the WAN will GUARANTEE fairness
of RELIABLE packet delivery (periodic info updates from Server to Client
stations) with less than 0.1 sec latency between packet delivery 
to first (1) and last (N) Client station. 

Currently, I am thinking of two possible approaches:

Approach 1: 
-----------
Implement the WAN through an appropriate X.25 switch able to enforce the
special QoS guarantee mentioned above.

Questions to be answered: 
1. Which X.25 vendors/products (switches,PADs, etc) support the above 
   broadcast capability ?
2. Is it possible (any products?) to also run IP over the above WAN with 
   acceptable overhead so that the special QoS guarantee mentioned above
   is still enforced ?

Approach 2: 
-----------
Implement the WAN as an IP internetwork - with Multicast extensions - able to
enforce the special QoS guarantee mentioned above. 

Questions to be answered:
1. How RELIABLE delivery of packets can be enforced on the above WAN 
   (using UDP/IP-Multicast or other) ?
2. Any IP products (with Multicast extensions) able to enforce QoS guarantees 
   (especially the one mentioned above)? 

Any kind of help will be much appreciated.

Thank you in advance,

Kostas Karanassios
Network Manager

P.S. Please respond directly to me. Thank you.

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