David Mark Barach, 641065 Gulf Of Mexico Dr UNIT 605, Longboat Key, FL 34228

6973044, Dec 6, 2005

Mar 22, 2000

09/532988

David Barach - Boxboro MA, US

Cisco Technology, Inc. - San Jose CA

H04J003/18

370252, 370449, 370477, 370296

A system controller on a half-duplex communication bus architecture gathers statistical data from at least one line card. The line card automatically collects statistical data for the system controller in a controlled manner in an information buffer. Then, the line card reports a subset of the statistical data in the buffer to the system controller when polled either for the statistical data or for some other reason and the statistical data is selected to be reported. The line card reports the statistical data in place of reporting a null response in the preferred embodiment whenever possible.

7289441, Oct 30, 2007

Jul 22, 2002

10/200653

David Richard Barach - Boxborough MA, US

Cisco Technology, Inc. - San Jose CA

H04L 12/16

370230, 370231

An intermediate network node is configured to drop or reject new client sessions when its available resources are below a predetermined level. In this manner, the intermediate node can efficiently process a large number of new session attempts at substantially the same time. The intermediate node monitors the availability of its resources by calculating a load metric. The load metric is based on one or more partial load metrics, each corresponding to a different system resource. The load metric is compared with a predetermined value to determine whether the node has enough available resources to continue establishing new client sessions. Alternatively, the intermediate node rejects new client sessions when a total number of allocated “abstract resource units” rises above a predetermined level. That is, client sessions are assigned a predetermined number of abstract resource units on a per-protocol basis and a resource counter stores the number of abstract resource units allocated by the intermediate node. Each protocol is assigned a different time interval for a timing wheel, after which time the number of abstract resource units assigned for the protocol is subtracted from the resource counter.

7325059, Jan 29, 2008

May 15, 2003

10/439022

David Richard Barach - Boxborough MA, US
Bobby Batacharia - Brookline MA, US

Cisco Technology, Inc. - San Jose CA

G06F 15/173

709225, 709238, 709245, 711205, 711206

The present invention provides a technique for efficiently looking up address-routing information in an intermediate network node, such as a router. To that end, the node locates routing information stored in its memory using one or more “lookup” tables (LUT) which can be searched using a small, bounded number of dependent lookups, thereby reducing the number of dependent lookups conventionally performed. The LUTs are arranged so each table provides routing information for network addresses whose subnet mask lengths are within a different range (“stride”) of mask lengths. According to the technique, the node locates a network address's routing information by searching the LUTs, in order of decreasing prefix lengths, until the routing information is found. Preferably, several tables are searched in parallel. A match in a LUT may further point to a small MTRIE that enables the final bits of a prefix to be matched.

7961636, Jun 14, 2011

May 27, 2004

10/855213

David Richard Barach - Boxborough MA, US
Eliot Dresselhaus - San Francisco CA, US

Cisco Technology, Inc. - San Jose CA

H04L 12/28

370252, 370392

An intermediate network node is configured to forward a plurality of packets concurrently, e. g. , as a vector, rather than one packet at a time. As such, the node can load a single sequence of forwarding instructions that may be repeatedly executed for packets in the vector. In addition, the intermediate network node adaptively controls the rate at which it processes data packets through a directed forwarding graph. To that end, the intermediate node is configured to dynamically select the number of packets per vector, i. e. , vector size, processed at each node of the forwarding graph. Further, the intermediate node also may be configured to dynamically select timing intervals for one or more “node timers” used to control the rate at which packets traverse through the graph. Illustratively, the vector size and node-timer intervals are selected so that the average latency through the forwarding graph is less than a predetermined target latency, e. g. , 50 microseconds (μs).

8005098, Aug 23, 2011

Sep 5, 2008

12/205848

David Richard Barach - Boxborough MA, US
Cullen Jennings - Santa Cruz CA, US
David Delano Ward - Somerset WI, US

Cisco Technology, Inc. - San Jose CA

H04L 12/28

370400, 37039531, 37039532

Disclosed are, inter alia, methods, apparatus, computer-storage media, mechanisms, and means associated with load balancing across multiple network address translation (NAT) instances and/or processors. N network address translation (NAT) processors and/or instances are each assigned a portion of the source address traffic in order to load balance the network address translation among them. Additionally, the address space of translated addresses is partitioned and uniquely assigned to the NAT processors and/or instances such that the identification of the assigned NAT processor and/or instance associated with a received translated address can be readily determined there from, and then used to network address translate that received packet.

6470013, Oct 22, 2002

Oct 13, 1998

09/170402

David R. Barach - Boxboro MA
John A. DeNisco - Malden MA
Robert J. Goguen - Acton MA

Cisco Technology, Inc. - San Jose CA

H04L 1256

370392, 370401

A technique for configuring address information automatically for intelligent port cards such as in a cell multiplexer, router, or other internetwork device. A maintenance or control processor is included in the device together with a number of, for example, line and trunk units. The line and trunk units are loaded, monitored, and controlled by the controller via a backplane network. The backplane network must be assigned a subnet address which does not conflict with the management network interface also on the controller. In order to accomplish this, a LINK_LOOP broadcast packet is periodically sent over the backplane network containing the IP subnet address of the current master system controller. Line and trunk cards in a configuration state therefore wait to hear such a datagram configure their own IP addresses and to acquire the system controller IP address based on the message contents and then are able to initiate IOS IPC protocol over the backplane network as required. The invention eliminates the need for customers to configure the system controllers backplane management internet IP address, providing increased reliability and ease of use, as well as automatic rendevous with current controller in charge in a failure event.