摘要:
Methods, systems, and computer programs are presented for switching a network packet. One method includes operations for receiving a packet having a media access control (MAC) address, and for switching the packet by a first packet switching device (PSD) when the MAC address is present in a first memory. Further, the method includes operations for transferring the packet to a second PSD when the MAC address is absent from the first memory and present in a second memory associated with the second PSD, and for transferring the packet to a third PSD when the MAC address is absent from the first memory and the second memory.
摘要:
Methods, systems, and computer programs are presented for managing a switching layer fabric. A network device operating system (ndOS) program includes program instructions for exchanging switching policy regarding a switching of network packets in a plurality of ndOS switching devices having respective ndOS programs executing therein. The first ndOS program is executed in a first ndOS switching device, and the switching policy is exchanged with other ndOS programs via multicast messages. Further, the ndOS program includes program instructions for exchanging resource control messages with the other ndOS switching devices to implement service level agreements in the switching layer fabric, where the ndOS switching devices cooperate to enforce the service level agreements. Further yet, the ndOS program includes program instructions for receiving changes to the switching policy, and program instructions for propagating the received changes to the switching policy via message exchange between the ndOS programs. The ndOS switching devices are managed as a single logical switch that spans the plurality of ndOS switching devices.
摘要:
Methods, systems, and computer programs are presented for providing a program to a server. One method includes an operation for receiving a request by a switching device from a first server, the request being for a boot image for booting the first server. In addition, the method includes operations for determining if the boot image is available from non-volatile storage in the switching device, and for forwarding the request to a second server when the boot image is absent from the non-volatile storage. Further, the method includes an operation for sending the boot image to the first server from the switching device when the boot image is available from the non-volatile storage.
摘要:
In general, the invention relates to a network device that includes a port configured to receive a packet and a packet processor (PP) configured to receive the packet from the port, in response to receiving the packet, make a first determination that a trigger condition exists, and in response to the first determination, issue a configuration action, where the configuration action, when performed by the network device, modifies a configuration of a component on the network device.
摘要:
Methods, systems, and computer programs are presented for switching a network packet. One method includes operations for receiving a packet having a media access control (MAC) address, and for switching the packet by a first packet switching device (PSD) when the MAC address is present in a first memory. Further, the method includes operations for transferring the packet to a second PSD when the MAC address is absent from the first memory and present in a second memory associated with the second PSD, and for transferring the packet to a third PSD when the MAC address is absent from the first memory and the second memory.
摘要:
Methods, systems, and computer programs are presented for managing a switching layer fabric. A network device operating system (ndOS) program includes program instructions for exchanging switching policy regarding a switching of network packets in a plurality of ndOS switching devices having respective ndOS programs executing therein. The first ndOS program is executed in a first ndOS switching device, and the switching policy is exchanged with other ndOS programs via multicast messages. Further, the ndOS program includes program instructions for exchanging resource control messages with the other ndOS switching devices to implement service level agreements in the switching layer fabric, where the ndOS switching devices cooperate to enforce the service level agreements. Further yet, the ndOS program includes program instructions for receiving changes to the switching policy, and program instructions for propagating the received changes to the switching policy via message exchange between the ndOS programs. The ndOS switching devices are managed as a single logical switch that spans the plurality of ndOS switching devices.
摘要:
In general, in one aspect, the invention relates to a network device, including: an input port; an output port; a switch fabric including a primary fabric, an auxiliary fabric, and a controller; and a distributor configured to obtain, from the input port, a first data unit, provide the first data unit to the primary fabric, determine, after the first data unit is transmitted to the primary fabric, that the primary fabric is congested, send, in response to determining that the primary fabric is congested, a request to the controller to establish a data path through the auxiliary fabric, obtain, from the input port and after sending the request, a second data unit, provide the second data unit to the auxiliary fabric, where the auxiliary fabric transmits the second data unit to the aggregator through the data path in the auxiliary fabric.
摘要:
Methods, systems, and computer programs are presented for providing a program to a server. One method includes an operation for receiving a request by a switching device from a first server, the request being for a boot image for booting the first server. In addition, the method includes operations for determining if the boot image is available from non-volatile storage in the switching device, and for forwarding the request to a second server when the boot image is absent from the non-volatile storage. Further, the method includes an operation for sending the boot image to the first server from the switching device when the boot image is available from the non-volatile storage.
摘要:
One networking device includes a switch module, a server, and a switch controller. The switch module has ports with a communications interface of a first type (CI1) and ports with a communications interface of a second type (CI2). The server, coupled to the switch module via a first CI2 coupling, includes a virtual CI1 driver, which provides a CI1 interface in the server, defined to exchange CI1 packets with the switch module via the first CI2 coupling. The virtual CI1 driver includes a first network device operating system (ndOS) program. The switch controller, in communication with the switch module via a second CI2 coupling, includes a second ndOS program controlling, in the switch module, a packet switching policy defining the switching of packets through the switch module or switch controller. The first and second ndOS programs exchange control messages to maintain a network policy for the switch fabric.
摘要:
A phase-interpolator circuit is described. In the phase-interpolator circuit, an output signal, having a fundamental frequency and a phase, is generated based on a weighted summation of a first reference signal and a second reference signal, where the first reference signal has the fundamental frequency and a first phase, and the second reference signal has the same fundamental frequency and a second phase. Note that contributions of the first reference signal and the second reference signal, respectively, to the output signal are determined based on associated first and second impedance values in a weighting circuit in the phase-interpolator circuit. For example, a programmable capacitance ratio of two capacitors may be used to interpolate between the first reference signal and the second reference signal. Additionally, the phase-interpolator circuit may include a biasing circuit that provides a DC bias to the weighting circuit, and which amplifies the output of the weighting circuit to provide the output signal.