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25 lines
1.4 KiB
Plaintext
25 lines
1.4 KiB
Plaintext
OpenPGM is an open source implementation of the Pragmatic General Multicast
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(PGM) specification in RFC 3208 available at www.ietf.org. PGM is a reliable
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and scalable multicast protocol that enables receivers to detect loss, request
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retransmission of lost data, or notify an application of unrecoverable loss.
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PGM is a receiver-reliable protocol, which means the receiver is responsible
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for ensuring all data is received, absolving the sender of reception
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responsibility. PGM runs over a best effort datagram service, currently OpenPGM
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uses IP multicast but could be implemented above switched fabrics such as
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InfiniBand.
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PGM is appropriate for applications that require duplicate-free multicast data
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delivery from multiple sources to multiple receivers. PGM does not support
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acknowledged delivery, nor does it guarantee ordering of packets from multiple
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senders.
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PGM is primarly used on internal networks to help integrate disparate systems
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through a common communication platform. A lack of IPv4 multicast-enabled
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infrastructure leads to limited capability for internet applications, IPv6
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promotes multicast to be a part of the core functionality of IP but may still
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be disabled on core routers. Support of Source-Specific Multicast (SSM) allows
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for improved WAN deployment by allowing end-point router filtering of unwanted
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source traffic
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WWW: http://code.google.com/p/openpgm/
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