Switching device utilizing requests indicating cumulative amount of data
First Claim
1. A switching device comprising a plurality of ingress ports to receive data from external sources;
- a plurality of egress ports to transmit data to external destinations;
a plurality of queues to store data waiting to be transmitted from a particular ingress port to a particular egress port;
a request generator to generate requests for permission to transmit data for the queues, wherein a request indicates a cumulative amount of data contained in a respective queue;
a switching matrix to provide selective connectivity between the plurality of ingress ports and the plurality of egress ports; and
a scheduler to receive the requests, generate grants based thereon, and configure the switching matrix, wherein said scheduler operates on a pipeline schedule and modifies the requests received to account for grants generated in current period or previous period that are not reflected in the queues yet.
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Abstract
In general, in one aspect, the disclosure describes a switching device that includes a plurality of ingress ports to receive data from external sources and a plurality of egress ports to transmit data to external destinations. The switching device also includes a plurality of queues to store data waiting to be transmitted from a particular ingress port to a particular egress port. A request generator generates requests for permission to transmit data for the queues. A request indicates a cumulative amount of data contained in a respective queue. A switching matrix provides selective connectivity between the ingress ports and the egress ports. The switching device further includes a scheduler to receive the requests, generate grants based thereon, and configure the switching matrix. The scheduler operates on a pipeline schedule and modifies the requests received to account for grants generated in current period or previous period not reflected in the queues.
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Citations
36 Claims
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1. A switching device comprising
a plurality of ingress ports to receive data from external sources; -
a plurality of egress ports to transmit data to external destinations;
a plurality of queues to store data waiting to be transmitted from a particular ingress port to a particular egress port;
a request generator to generate requests for permission to transmit data for the queues, wherein a request indicates a cumulative amount of data contained in a respective queue;
a switching matrix to provide selective connectivity between the plurality of ingress ports and the plurality of egress ports; and
a scheduler to receive the requests, generate grants based thereon, and configure the switching matrix, wherein said scheduler operates on a pipeline schedule and modifies the requests received to account for grants generated in current period or previous period that are not reflected in the queues yet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 36)
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20. A method comprising:
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receiving data from external sources;
storing the data in queues, wherein the queues are associated with an external source from which the data came and an external destination to which the data is going;
generating requests for permission to transmit data from the queues, wherein a request indicates a cumulative amount of data contained in a respective queue;
receiving the requests at a scheduler operating on a pipeline schedule, wherein the scheduler generates grants based on the request and configures a switching matrix, wherein said scheduler modifies the requests received to account for grants generated in current period or previous period that are not reflected in the queues yet; and
transmitting the data to external destinations;
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31. A store and forward device comprising
a plurality of Ethernet cards to receive data from and transmit data to external sources, wherein the plurality of Ethernet cards include an ingress interface module to receive data from external sources, store the data in queues associated with at least some subset of destination and priority, generate requests that identify the cumulative amount of data in associated queues, and transmit data from queues upon receipt of an associated grant; - and
an egress interface module to receive data from the ingress interface module, and transmit the data to a destination;
a switching matrix to provide selective connectivity between the Ethernet cards;
a backplane consisting of a plurality of channels to connect the plurality of Ethernet cards to the switching matrix; and
a scheduler to receive the requests, process the requests and generate grants therefrom, and configure the switching matrix accordingly, wherein said scheduler operates on a pipeline schedule and modifies the requests received to account for grants generated in current period or previous period that are not reflected in the queues yet. - View Dependent Claims (35)
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Specification