IP switching-ATM under IP
Newman, P.
Minshall, G.
Lyon, T.L.
Ipsilon Networks, Sunnyvale, CA;
This paper appears in: Networking, IEEE/ACM Transactions on
Publication Date: Apr 1998
Volume: 6,
Issue: 2
On page(s): 117-129
ISSN: 1063-6692
References Cited: 43
CODEN: IEANEP
INSPEC Accession Number: 5898949
Digital Object Identifier: 10.1109/90.664261
Current Version Published: 2002-08-06
Abstract
Internet protocol (IP) traffic on the Internet and private
enterprise networks has been growing exponentially for some time. This
growth is beginning to stress the traditional processor-based design of
current-day routers. Switching technology offers much higher aggregate
bandwidth, but presently only offers a layer-2 bridging solution.
Various proposals are under way to support IP routing over an
asynchronous transfer mode (ATM) network. However, these proposals hide
the real network topology from the IP layer by treating the data-link
layer as a large opaque network cloud. We argue that this leads to
complexity, inefficiency, and duplication of functionality in the
resulting network. We propose an alternative in which we discard the
end-to-end ATM connection and integrate fast ATM hardware directly with
IP, preserving the connectionless nature of IP. We use the soft-state in
the ATM hardware to cache the IP forwarding decision. This enables
further traffic on the same IP flow to be switched by the ATM hardware
rather than forwarded by IP software. We claim that this approach
combines the simplicity, scalability, and robustness of IP, with the
speed, capacity, and multiservice traffic capabilities of ATM
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