DocumentCode :
3402814
Title :
RAMP: a reliable adaptive multicast protocol
Author :
Koifman, Alex ; Zabele, S.
Author_Institution :
TASC, Reading, MA, USA
Volume :
3
fYear :
1996
fDate :
24-28 Mar 1996
Firstpage :
1442
Abstract :
The specifications and performance of RAMP a reliable adaptive multicast protocol, are presented. Initially described in IETF RFC 1458 (1993), RAMP has been enhanced for use over an all-optical, circuit-switched, gigabit network under our ARPA-sponsored testbed for optical networking (TBONE) project. RAMP uses immediate, receiver-initiated, NAK-based, unicast error notification combined with originator based unicast retransmission. The approach is motivated by the loss characteristics of the TBONE network, where extremely low bit-error rates (10-12 or better) and the absence of any store-and-forward capabilities in the switches make packet losses almost entirely a result of receiver buffer overflows. As receiver losses are largely independent, use of unicast over multicast for NAKs and retransmission eliminates unnecessary receiver processing overhead associated with reading and discarding redundant packets. Use of immediate rather than delayed NAKs further improves performance by reducing both latency and the likelihood of buffer overflow. The effectiveness of this combined error control approach has been verified by other researchers, as well as through our own investigations. Interestingly, TBONE loss characteristics resemble those of switched virtual circuit ATM networks and packet-switched networks employing reservation services. As these networks provide quality of service guarantees in the switches, the likely source of packet loss is again due to receiver errors and buffer overflows. Hence, RAMP´s design is also relevant for the next generation of packet switched networks
Keywords :
circuit switching; losses; optical fibre LAN; optical fibre networks; packet switching; protocols; Ethernet LAN; NAK; QoS guarantees; RAMP; TBONE; all-optical circuit-switched gigabit network; bit-error rates; error control approach; latency; loss characteristics; optical networking; packet loss; packet losses; packet switched networks; performance; receiver buffer overflows; redundant packets; reliable adaptive multicast protocol; specifications; unicast error; unicast retransmission; Buffer overflow; Circuit testing; Delay; Multicast protocols; Optical buffering; Optical fiber networks; Optical packet switching; Packet switching; Switches; Unicast;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
INFOCOM '96. Fifteenth Annual Joint Conference of the IEEE Computer Societies. Networking the Next Generation. Proceedings IEEE
Conference_Location :
San Francisco, CA
ISSN :
0743-166X
Print_ISBN :
0-8186-7293-5
Type :
conf
DOI :
10.1109/INFCOM.1996.493093
Filename :
493093
Link To Document :
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