Doug --
I wrote to Jim Wilkinson last night and got the following reply. Hope this helps.
Regards,
Pat
<<<
(feel fee to edit the information below anyway you like and post, you
can use my name if you wish)
A quick reply to that question? Gee, I only wish I were that good !
The question asked is multifaceted, and probably has more answers than an octopus has arms.
The best I can do is to give some resource URL's and let the person
look for the answer he feels provides the best answer. If they can not find the exact answer, I would suggest emailing Ipsilon or Cisco and posing the question.
Out of the URL's below " Multi Layer Routing" seems to be best suited
for the information desired.
Could you kindly enlighten me regards the current solutions to the traffic jam going from IP to ATM. In particular I would like to know when and where Intelligent hardware switches are used vrs Software dependent routers.
In past research I have found that in the future both Intelligent hardware switches / Software dependent routers will eventually be combined into a single solution, and the best solution of the two will automatically be used for a given the situation. Though I suspect research is still on going to determine which is best in each case. So the answer to when and where (currently) may depend on the company you ask. Of course this is only MHO, and I may very well be wrong.
Jim
Switching is a bottleneck for implementing a broadband end to end network. In a broadband network switching has to provide
- appropriate capacity for switching bursty and dynamically changing
traffic in an effective way,
- dynamic resource allocation for effective use of network resources,
- quality of service,
- flexibility and easy use of network resources by service architectures.
Internet is viewed as the prototype for the future Information Superhighway. The current Internet technology has, however, a number of drawbacks including
-- limited transmission and routing capacity and limited speed,
-- long and variable transmission delays,
-- no support for quality of service.
A remarkable advantage provided by the Internet is isolation of the
network from services by the IP layer.
For overcoming the switching capacity shortfall, it has been suggested
that the Internet should be boosted by building its backbone using ATM technology. This has raised the issue of how to optimally put the IP -protocol on top of ATM. The Internet Engineering Task Force (IETF) and ATM-Forum have proposed solutions such as Classical IP over ATM, LAN emulation (LANE) and the Multi Protocol over ATM (MPOA). All of these solutions have their advantages and drawbacks.
Most recent solution to map IP on top of ATM comes from a small US company, IPSILON. After IPSILON a number of companies and individuals (CISCO - Tag switching, Toshiba, IBM and SITA - Juha Heinänen) have proposed other adaptive algorithms for the purpose of mapping ATM network resources dynamically to the current traffic profile.
keskus.hut.fi
Multi Layer Routing
csl.sony.co.jp
Search of IP Traffic to ATM Ipsilon
ipsilon.com
IP Switching: ATM Under IP
ipsilon.com;
IP Multicast over ATM Point-to-Multipoint Virtual Circuits
cisco.com |
