Backward congestion notification

摘要

In one embodiment, an apparatus comprises a network interface system having at least one input port configured for receiving frames and a logic system comprising at least one logic device. The logic system may be configured to perform the following functions: determining a source address and a destination address of a frame received at an ingress port; calculating a flow hash based at least upon the source address and the destination address; forming a congestion management (“CM”) tag that includes the flow hash; inserting the CM tag in the frame; and forwarding the frame to the destination address.

主权项

1. A method, comprising:
receiving, at an ingress port of a core switch of a first Data Center Ethernet portion of a network, a first frame from an Ethernet portion of the network, the first frame comprising a congestion management (“CM”) tag and a first destination address; determining that the CM tag indicates a first hierarchical media access control (“MAC”) address of a device in a second Data Center Ethernet portion of the network; determining that the first hierarchical MAC address matches a second hierarchical MAC address of the ingress port; modifying the CM tag to indicate that a second frame should be forwarded to the device in the second Data Center Ethernet portion of the network, wherein the second frame indicates the first hierarchical MAC address as a second destination address for the second frame and wherein the second frame comprises a backwards congestion notification (“BCN”) message; and forwarding the first frame to the first destination address of the first frame.