Logical multicast from a switch configured for spatial...

H - Electricity – 04 – L

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H04L 12/56 (2006.01)

Patent

CA 2266493

A method and apparatus are disclosed for multicasting through a single physical port (1) in a switch (10), i.e., logical multicasting. An incoming cell is logically multicast by providing a first copy of the cell to the desired output port (8) and providing a second copy of the cell to a loop-back element (18) which includes standard input and output ports dedicated to loop- back operation. The cell provided to the loop-back element (18) is subsequently provided to the desired output port (8) such that the first and second copies of the cell are serially transmitted from the single desired output port (8). Further, the cell provided to the loop-back element (18) may be repeatedly copied, provided to the loop-back element (18), and provided to the desired output port (8). Thus, the incoming cell may be transmitted through a single output port (8) as many times as is desired.

L'invention concerne un procédé et un appareil de multi-report par un seul port physique (1) dans un commutateur (10), c'est-à-dire, le multi-report logique. Une cellule entrante est soumise à un multi-report logique par transmission d'une première copie de la cellule au port (8) de sortie voulu et transmission d'une seconde copie de la cellule à un élément de mise en boucle (18), lequel comprend des ports d'entrée et de sortie classiques spécialisés pour un fonctionnement par mise en boucle. La cellule transmise à l'élément de mise en boucle (18) est ensuite transmise au port de sortie voulu (8), de sorte que les première et seconde copies de la cellule soient transmises en série par le port de sortie individuel voulu (8). De plus, la cellule transmise à l'élément de mise en boucle (18) peut être copiée de façon répétée, transmise à l'élément de mise en boucle (18) et envoyée au port de sortie voulu (8). Ainsi, la cellule entrante peut être transmise par un seul port de sortie (8) autant de fois qu'on le souhaite.

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