Patent ID: 11956154
Assignee: nan
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 4:
5. A method for congestion avoidance implemented at a first switch at a first node that is a congestion point (CP) in a network comprising a plurality of interconnected nodes in a Data Center, the method comprising:
identifying data link frames of network flows to be stored and forwarded from a first queue of the first switch, having a high network load indicative of congestion at the CP in the network;
the first switch having a plurality of queues, each for storing and forwarding different network flows of data link frames, where the different network flows belong to differing quality of service;
a second network switch at a second node, wherein the second network switch is configured to be connected via a second port on the second network switch to a first port on the first network switch;
the second network switch configured to receive and forward datalink frames of network flows to the first network switch from connected sources;
generating and sending by the first network switch a first request to the second network switch to delay, by stopping for a period, data link frames of the network flows to be stored in the first queue having the high network load on the first network switch;
the first request comprising the identification of the data link frames comprising the network flows to be delayed;
responsive to the first request received, the second network switch delaying, by stopping for a period of time, sending the data link frames of the network flows received from the connected sources to be stored and forwarded from the first queue of the first network switch, while continuing to send data link frames of network flows to be stored and forwarded from the other of the plurality of queues not having the high network load;
the first network switch further enabling generation of a second request comprising identification of the data link flows to be stored in the first queue on the first switch and the identification of the source of the flows, to be sent to the sources of the data link frame flows; and
responsive to the second request, the sources delay the transmission of the identified data link flows;
wherein the responses to the first request and the second request enable the method to avoid congestion and data loss at the CP in Data centers.