Flow control system to reduce memory buffer requirements and...

G - Physics – 06 – F

Patent

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Details

G06F 15/16 (2006.01) G01R 31/08 (2006.01) H04L 12/46 (2006.01) H04L 12/56 (2006.01) H04L 25/05 (2006.01)

Patent

CA 2444881

The invention is a system and method to allow precise control of the transmit packet rate between two different networks (120) and to optionally introduce a priority servicing scheme across several related output ports of a switch engine (110). The invention employs flow control circuitry (101) to regulate data packet flow across a local interface (100) within a single device by asserting back-pressure. Specifically, flow control is used to prevent a switch port (102) from transmitting a data packet until a subsequent processing stage is ready to accept a packet via that port (102). The downstream node only permits transmission of packets from the switch when its buffer is available.

La présente invention concerne un système et un procédé qui permettent de commander avec précision le débit de transmission des paquets entre deux réseaux différents (120) et éventuellement d'introduire un plan de service prioritaire au niveau de plusieurs ports de sortie reliés d'un moteur (110) de commutateur. Dans cette invention, on utilise un ensemble circuit (101) de commande du flux qui établit une contre-pression pour réguler le flux des paquets de données au niveau d'une interface locale (100) dans un dispositif unique. De manière spécifique, la commande du flux permet d'empêcher un port (102) du commutateur d'envoyer un paquet de données tant qu'un étage de traitement suivant n'est pas prêt à accepter un paquet via ce même port (102). Le noeud aval n'autorise l'envoi des paquets provenant du commutateur que lorsque son tampon est disponible.

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