International Business Machines Corporation

Todd Alan Greenfield

Claude Basso

Bruce Marshall Walk

Natarajan Vaidhyanathan

Joseph Allen Kirscht

David Alan Shedivy

John Michael Borkenhagen

Josep Cors

Wayne Melvin Barrett

Brian Thomas Vanderpool

Michel Poret

James Anthony Marcella

Philip Rogers Hillier, Iii

Mark L Rudquist

Kenneth Michael Valk

Jon K Kriegel

Thomas Charles Brennan

Debra L Angst

Timothy Lindquist

Kenneth M Walk

Gene Leung

Ryan Black

Techniques regarding routing qubit data are provided. For example, one or more embodiments described herein can comprise a computer-implemented method for training a quantum controller fast path interface that can control the qubit data routing. The computer-implemented method can comprise training, by a system operatively coupled to a processor, the quantum controller fast path interface for routing qubit data bits between a quantum controller and conditional engine by adjusting a delay value such that a mesochronous clock domain is characterized by a direct register-to-register transfer pattern.

Quantum controller fast path interface

Embodiments presented herein describe techniques for selecting incoming network frames to be mirrored using an access control list. According to one embodiment, an incoming frame is received. Upon determining that the incoming frame matches an entry in the access control list, a mirror field of the entry is evaluated. The mirror field identifies at least one mirroring action to perform on the frame. The identified mirroring action is performed on the frame.

Access control list-based port mirroring techniques

Embodiments presented herein describe techniques for parsing an Internet Protocol version 6 frame and skipping extension headers of the frame. A configurable skip list is provided that specifies extension headers for a networking device to skip when parsing the frame. The networking device examines 'next header' fields of each extension header to determine a next extension header in the chain. If the next extension header matches an extension header in the skip list, the networking device iterates to the next header in the chain until the end of the chain (or an extension header that does not contain a match in the list) is reached.

Skipping and parsing internet protocol version 6 (IPv6) extension headers to reach upper layer headers

Skipping and parsing internet protocol version 6 extension headers to reach upper layer headers

Receive a request to write a unit of data, having a first half of bits and a second half of bits, to an index of a ternary content addressable memory (TCAM). Generate a first error-correcting code (ECC) codeword for first bits of the first half of bits of the unit of data and first bits of the second half of bits of the unit of data. Generate a second error-correcting code (ECC) codeword for second bits of the first half of bits of the unit of data and second bits of the second half of bits of the unit of data. Store the first half of bits of the unit of data in the first row of the index. Store the second half of bits of the unit of data in the second row of the index.

Handling errors in ternary content addressable memories

Techniques are provided for multicast miss notification for a distributed network switch. In one embodiment, a bridge element in the distributed network switch receives a frame destined for a multicast group on a network. If a local multicast forwarding table of the bridge element does not include any forwarding entry for the multicast group, a forwarding entry is selected from the local multicast forwarding table as a candidate for being replaced. An indication of the candidate is sent to a management controller in the distributed network switch.

Multicast miss notification for a distributed network switch

A distributed switch may include a hierarchy with one or more levels of surrogate sub-switches (and surrogate bridge elements) that enable the distributed switch to scale bandwidth based on the size of the membership of a multicast group. Moreover, each surrogate may optimize the hierarchy according to one or more optimization criteria. For example, each surrogate in the hierarchy may have the necessary information to ensure that if the next surrogate in the hierarchy is unavailable, the data may be routed to a backup surrogate. The selected hierarchy may be further optimized by skipping surrogates (or a surrogate level) such that the data intended for a skipped surrogate is sent to a surrogate in a lower-level of the hierarchy. This may better utilize the connection interfaces in the transmitting sub-switches and eliminate any unnecessary surrogate-to-surrogate transfers.

Dynamic optimization of a multicast tree hierarchy for a distributed switch

A distributed switch may include a hierarchy with one or more levels of surrogate sub-switches (and surrogate bridge elements) that enable the distributed switch to scale bandwidth based on the size of the membership of a multicast group. When a sub-switch receives a multicast data frame, it forwards the packet to one of the surrogate sub-switches. Each surrogate sub-switch may then forward the packet to another surrogate in a different hierarchical level or to a destination computing device. Because the surrogates may transmit the data frame in parallel using two or more connection interfaces, the bandwidth used to forward the multicast packet increases for each surrogate used.

Multicast traffic generation using hierarchical replication mechanisms for distributed switches

The distributed switch may include a plurality of chips (i.e., sub-switches) on a switch module. These sub-switches may receive from a computing device connected to a Tx/Rx port a multicast data frame (e.g., an Ethernet frame) that designates a plurality of different destinations. Instead of simply using one egress connection interface to forward the copies of the data frame to each of the destinations sequentially, the sub-switch may use a plurality of a connection interfaces to transfer copies of the multicast data frame simultaneously. The port that receives the multicast data frame can borrow the connection interfaces (and associated hardware such as buffers) assigned to these other ports to transmit copies of the multicast data frame simultaneously.

Multicast bandwidth multiplication for a unified distributed switch

Apparatuses and methods to request multicast membership information in a distributed switch are provided. A particular method may include requesting multicast membership information of a group identified by a multicast destination address in a distributed switch. The distributed switch may include a plurality of distributed switch elements with a plurality of switch forwarding units. The method may generate a miss event indicating that the multicast destination address is unregistered in a switch forwarding unit of a distributed switch element and there is a need for the multicast membership information. The method may also request the multicast membership information of the multicast destination address in response to the miss event. The method may further initiate a query for the multicast membership information of the multicast destination address in response to the request.

Growing community of inventors

Rochester, MN, United States of America

Todd Alan Greenfield