Apparatus and method for monitoring data flow at a node on a...

H - Electricity – 04 – L

Patent

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H04L 12/56 (2006.01) H04L 12/26 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2326124

An apparatus and method for monitoring data flow at a node on a network are disclosed. A memory location or "bucket" is allocated to each of a plurality of links and classes of service at the node. A free-running counter is incremented at a rate determined by the maximum allowable data rates on the various links and classes of service. When a data packet is received at a particular link and class of service, the corresponding memory location or bucket is adjusted or "leaked" by subtracting the present counter value from the present bucket contents. That difference is then added to the number of units of data, i.e., bytes or groups of bytes of data, contained in the incoming packet. That sum is then compared with a predetermined threshold determined by the allowable data rate associated with the link and class of service. If the threshold is exceeded, then the incoming data packet is marked accordingly. The system can include multiple stages of monitoring such that multiple thresholds can be used to assign one of the multiple discard eligibility values to the incoming packet.

L'invention porte sur un appareil et un procédé de surveillance d'un flux transitant par un noeud de réseau. Un emplacement de mémoire ou "case" est attribué à chaque "lien + classe de service" d'un ensemble, et un compteur libre progresse par incréments à un rythme déterminé par les débits maximaux de données des différents "liens + classes de service". Lorsqu'un paquet de données est reçu par un "lien + classe de service" particulier, l'emplacement de mémoire ou "case" correspondant est ajusté ou purgé en soustrayant du contenu actuel de la "case" la valeur actuelle du compteur. Cette différence est alors ajoutée au nombre d'unités de données c.-à-d. d'octets ou de groupes d'octets de données contenus dans le paquet arrivant. Cette somme est alors comparée avec un seuil prédéterminé fonction du débit de données attribuable associé au "lien + classe de service". Si le seuil est dépassé, le paquet arrivant est marqué en conséquence. Le système peut comporter plusieurs niveaux de surveillance permettant d'utiliser plusieurs seuils pour attribuer au paquet arrivant l'une des différentes valeurs d'éligibilité au rejet.

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