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author | Ossama Othman <ossama-othman@users.noreply.github.com> | 2005-02-08 08:34:52 +0000 |
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committer | Ossama Othman <ossama-othman@users.noreply.github.com> | 2005-02-08 08:34:52 +0000 |
commit | 26054da56f8a7010ce1184ab59fd050edcbb2473 (patch) | |
tree | afa5329cb09b2e120eed291f01d596d7d04af51b /ace/RMCast/README | |
parent | 82aef7a2d6a19d4c01e6fce9a0f103b97ffa944c (diff) | |
download | ATCD-new-rmcast.tar.gz |
ChangeLogTag:Tue Feb 8 00:22:48 2005 Ossama Othman <ossama@dre.vanderbilt.edu>new-rmcast
Diffstat (limited to 'ace/RMCast/README')
-rw-r--r-- | ace/RMCast/README | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/ace/RMCast/README b/ace/RMCast/README new file mode 100644 index 00000000000..d8cfbc040c7 --- /dev/null +++ b/ace/RMCast/README @@ -0,0 +1,22 @@ +RMCast is a reliable source-ordered multicast protocol implementation +for message-oriented multi-sender group communication built on top of +IPv4 multicast. It uses sequence numbers for re-ordering, duplicate +suppression and loss detection. Negative acknowledgments (NAK) with +retransmissions are used to recover from losses. + +One new and interesting idea implemented in this protocol is history +transmission (dubbed negative retransmission). In a nutshell, each +sender, along with normal payload, transmits a list of other sender's +IDs along with sequence numbers of last messages received from those +senders by this member. This, in some sense, builds a pyramid of +information: each subsequent message carries some information for a +number of previous messages (from other senders). This helps other +receivers detect losses. + +The protocol does not track group membership. Messages are retained +for retransmission for a predefined amount of time. The "last message +or lost message" dilemma is solved by periodic history transmissions +in cases when there is no useful traffic (idle network). + +-- +Boris Kolpackov <boris@kolpackov.net> |