Scalable flow and congestion control with OpenFlow
First Claim
1. A system for performing congestion management in a network, the system comprising:
- a switch configured to connect to the network, the switch comprising;
a memory having computer readable computer instructions; and
a processor for executing the computer readable instructions, the instructions including;
monitoring both data packets and data requests received at the switch over one or more links in the network;
based on the monitoring, determining a congestion status at the switch;
determining that the congestion status indicates that there is congestion at the switch, the determining including examining a plurality of flags in a header field of an entry corresponding to a flow in a flow table at the switch, the plurality of flags including a forward congestion that when set indicates that a source of data for the data flow is sending data more quickly than the switch can process the data, and a backward congestion flag that when set indicates that a destination of data for the data flow is sending data requests more quickly than the switch can process the data requests;
based on the forward congestion flag being set and congestion being related to data packets received at the switch from the source at a first rate, transmitting a first message to the source requesting the source to send the data at a second rate that is slower than the first rate; and
based on the backward congestion flag being set and congestion being related to data requests received at the switch from the destination at a third rate, transmitting a second message to the destination requesting the destination to send the data requests at a fourth rate that is slower than the third rate.
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Accused Products
Abstract
A method of performing congestion management in a network is provided. The method includes monitoring a congestion status at a switch in the network. It is determined at the switch that the congestion status indicates that there is congestion at the switch. Based on the congestion being related to data received at the switch from a source at a first rate, a first message is transmitted from the switch to the source requesting the source to send the data at a second rate that is slower than the first rate. Based on the congestion being related to data requests received at the switch from a destination at third rate, a second message is transmitted from the switch to the destination requesting the destination to request the data at a fourth rate slower than the third rate.
149 Citations
7 Claims
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1. A system for performing congestion management in a network, the system comprising:
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a switch configured to connect to the network, the switch comprising; a memory having computer readable computer instructions; and a processor for executing the computer readable instructions, the instructions including; monitoring both data packets and data requests received at the switch over one or more links in the network; based on the monitoring, determining a congestion status at the switch; determining that the congestion status indicates that there is congestion at the switch, the determining including examining a plurality of flags in a header field of an entry corresponding to a flow in a flow table at the switch, the plurality of flags including a forward congestion that when set indicates that a source of data for the data flow is sending data more quickly than the switch can process the data, and a backward congestion flag that when set indicates that a destination of data for the data flow is sending data requests more quickly than the switch can process the data requests; based on the forward congestion flag being set and congestion being related to data packets received at the switch from the source at a first rate, transmitting a first message to the source requesting the source to send the data at a second rate that is slower than the first rate; and based on the backward congestion flag being set and congestion being related to data requests received at the switch from the destination at a third rate, transmitting a second message to the destination requesting the destination to send the data requests at a fourth rate that is slower than the third rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification