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Lollipop sequence numbering : ウィキペディア英語版
Lollipop sequence numbering
Lollipop sequence numbering is a numbering scheme used in routing protocols. In this numbering scheme, sequence numbers start at a negative value, increase until they reach zero, then cycles through a finite set of positive numbers indefinitely. When a system is rebooted, the sequence is restarted from a negative number again. This allows recently rebooted systems to be distinguished from systems which have simply looped around their numbering space. This path can be visualized as a line with a circle at the end; hence a lollipop.
Lollipop sequence numbering was originally believed to resolve the ambiguity problem in cyclic sequence numbering schemes, and was used in OSPF version 1 for this reason. Later work showed that this was not the case, and OSPF version 2 replaced it with a linear numbering space, with special rules for what happens when the sequence numbers reach the end of the numbering space.
==References==

* R. Perlman. "Fault-Tolerant Broadcasting of Routing Information." ''Computer Networks'', Vol. 7, December 1983, pp. 395–405.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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