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PgmHistory
History1998 January
Deleted reference to proprietary trademark. 1998 August
This revision benefited from general discussions in the forum of
the Reliable Multicast IRTF as well as from individual discussion
with Dan Leshchiner concerning source addressing and NAK elimina-
tion, with Chetan Rai concerning outgoing packet ordering and
local retransmission, and with Jim Gemmell, Luigi Rizzo, and
Lorenzo Vicisano concerning FEC.
Clarified that RDATA from DLRs and NCFs from network elements MUST
bear the ODATA source's network-header source address.
Added NAK elimination timer and corresponding procedures to net-
work elements.
Added procedures and packet formats to incorporate FEC.
Changed all the packet type encodings to anticipate versioning and
extension.
Added work-in-progress items for RDATA delay at the source and
minimum NAK back-off at receivers.
Added work-in-progress items for SPMRs.
1999 June
The polling and implosion control procedures in this document were
developed jointly with Jim Gemmell. The work on SPMRs arose from
discussions with Dan Leshchiner.
Removed range NAKs for re-working.
Generalized and simplified methods for advancing transmit window.
Removed increment sequence number from SPM packets.
Removed Appendix B's information for congestion avoidance.
Removed "local retransmission" in favor of full DLR functionality.
Added generic polling capability within a single PGM hop.
Added procedures to adjust NAK_BO_IVL dynamically and to address
potential NAK implosion problems.
Added SPMR procedures and packet formats.
1999 August
1999 October
2000 April
Introduced NAK lists.
Revised DLR procedures to include off-tree DLRs.
Revised description of NAK procedures.
Changed TPDU length in packet formats to TSDU length.
Swap of SQN and TRAIL fields in ODATA/RDATA header formats.
Removed RSN TSN Appendix (formerly Appendix C).
Added FIN/SYN/RST support
Defined SPM NLA = 0 to mean that no path information is present.
Defined SPM_TRAIL/LEAD values when no windowing information is
present.
Rationalized the option number space. Note to implementors: this
is a significant change, so make sure your options have the right
numbers in the right order.
Moved the bulk of the Transmit Window information to Appendix F.
OPT_VAR_SIZE became OPT_VAR_PKTLEN, a more descriptive and useful
name.
2000 August
2000 November
Added the specification allowing the combined use of fragmentation
and FEC.
Changed the text in the FEC appendix to disallow receivers to send
selective NAKs when parity is available (in the "SHOULD NOT"
form).
Changed the text that deals with prioritization of packet
transmission at the source.
Lower-case "must", "should" .. etc changed to upper-case where
needed.
Added an "Intellectual Property" disclaimer.
Fixed the packet format of OPT_FRAGMENT.
Fixed some typos and minor inconsistencies.
2001 February
To accommodate very small transmit windows, relaxed the require-
ment that SPMs be sent at least at the rate at which the transmit
window is advanced.
Deleted the recommendation that a source SHOULD transmit RDATA at
priority over concurrent ODATA.
Changed the use of multicast NAKs from a recommendation to an
option.
Revised the text throughout to prohibit selective NAKs in FEC ses-
sion except for the leading partial transmission block.
To accommodate shortening a transmission group after the transmis-
sion of the last data packet, relaxed the requirement that
OPT_CURR_TGSIZE be appended to the last data packet in a shortened
group.
Revised the procedures for handling fragments in an FEC session.
Added rounds and their application to the polling procedures.
Removed the option of setting SPM_PATH to zero.
2001 July
2001 September
2001 October
2001 December
2002 May
2002 June
2003 April
2003 June
2004 January
2004 July
2005 May
2005 October
2006 August
2009 May
2010 February
2010 March
2010 April
2010 September
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