Jeffrey H Wang

US Patent:

7065079, Jun 20, 2006

Filed:

May 4, 2000

Appl. No.:

09/564604

Inventors:

Abhijit Patra - Santa Clara CA, US
Milton Xu - San Jose CA, US
Peram Marimuthu - Sunnyvale CA, US
Jeffrey Wang - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/56

US Classification:

370390, 3702381, 709238

Abstract:

Only one point to multipoint virtual circuit (p2mp VC) is used within a router to handle all of the sources for a particular multicast group when other particulars of the multicast group are identical within that router. The router receiving a multicast packet for a particular multicast group identifies the source and the group number by reading fields of the incoming packet, identifies the input port of the router, and identifies the output port list. The input port of the router, the group number G, and the output port list are used by the router in establishing and identifying a point to multipoint VC within the router. The invention identifies all packets arriving at that particular input port, having the same multicast group number G, and having the same output port list, and transfers them to the identified VC. The VC is associated in the routing table with the output list of ports from which copies of the multicast packet are transmitted. Accordingly, only one VC is needed to transfer packets arising from any source of the multicast group so long as the multicast packets arrive on the same port of the router and have the same output port list.

US Patent:

7751416, Jul 6, 2010

Filed:

Sep 18, 2003

Appl. No.:

10/666306

Inventors:

Michael Smith - Morgan Hill CA, US
Ali Golshan - Palo Alto CA, US
Jeffrey Ym Wang - Saratoga CA, US
Neelima Mehta - Atlanta GA, US
Venkatesh Janakiraman - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/56

US Classification:

370410, 370419, 709208, 709220, 709227

Abstract:

Method and devices are provided to form virtual switches for data networks. As noted above, the term “switch” as used herein will apply to switches, routers and similar network devices. Each virtual switch acts as a single logical unit, while encompassing at least two physical chassis. Accordingly, each virtual switch may be treated as a single point of management. Each virtual switch includes a master chassis and at least one slave chassis. The master chassis is configured to control the slave chassis. The master chassis includes at least one master supervisor card and the slave chassis includes at least one slave supervisor card. The master chassis and the slave chassis communicate via a virtual switch link according to a virtual switch link protocol.

US Patent:

7792124, Sep 7, 2010

Filed:

Apr 1, 2007

Appl. No.:

11/695049

Inventors:

Michael Smith - San Jose CA, US
Dileep Kumar Devireddy - San Jose CA, US
Saravanakumar Rajendran - San Jose CA, US
Jeffrey Ym Wang - Saratoga CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/56

US Classification:

37039554, 370351, 370401, 370397, 370399, 3703951

Abstract:

Method and system for providing access layer satellite architecture in a data network including receiving a data packet from an access layer network device, the data packet including a Virtual Local Area Network (VLAN) identifier associated with a port on the access layer network device, performing a route lookup procedure based on the received data packet to determine a destination of the data packet, updating an ARP table with a Media Access Control (MAC) address associated with the VLAN identifier and the port of the received data packet, and transmitting the data packet to a destination network device, is disclosed.

US Patent:

8259562, Sep 4, 2012

Filed:

Mar 7, 2005

Appl. No.:

11/074923

Inventors:

Michael Smith - San Jose CA, US
Jeffrey Wang - Saratoga CA, US
Roger Karam - Mountain View CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G01R 31/08

US Classification:

370225, 370242

Abstract:

Systems and method for providing redundancy of communications and/or inline power to a powered Ethernet device are disclosed. A redundancy device is configured to receive in-line data and/or power from a plurality of Ethernet relay uplinks and to monitor communications between the relay uplinks. One of the relay uplinks is established as an active state uplink and passes data and/or power to the power device. Responsive to a switchover communication from a redundant uplink, the redundancy device establishes the redundant uplink as the active uplink, thereby passing data and/or power from the redundant uplink to the power device. The relay uplinks may use packet-based communication to sense when there is a failure in a link, and replace a failed device with a redundant device.

US Patent:

8526427, Sep 3, 2013

Filed:

Oct 21, 2003

Appl. No.:

10/690348

Inventors:

Michael R. Smith - Morgan Hill CA, US
Jeffrey Ym Wang - Saratoga CA, US
Ali Golshan - Palo Alto CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/56
H04L 12/28

US Classification:

370389

Abstract:

A method may involve: receiving a packet (e. g. , via a port or uplink interface in a satellite switch) and conveying the packet between one or more ports and one of several uplink interfaces. The one or more ports and the uplink interface are associated with each other. The association can be independent of VLAN (Virtual Local Area Network). As an example, such a method can involve: receiving a first packet via a first port; conveying the first packet to a distribution-layer via a first uplink interface; receiving a second packet via a second port; and conveying the second packet to the distribution-layer via a second uplink interface, where the first uplink interface is associated with the first port and the second uplink interface is associated with the second port. In some embodiments, ports and uplink interfaces are associated by being assigned to the same virtual linecard.

US Patent:

8625592, Jan 7, 2014

Filed:

Feb 26, 2008

Appl. No.:

12/037525

Inventors:

Saravanakumar Rajendran - San Jose CA, US
Michael Smith - San Jose CA, US
Dileep Kumar Devireddy - San Jose CA, US
Pradeep K. Kathail - Los Altos CA, US
Chandrashekhar Appanna - Cupertino CA, US
Jeffrey Ym Wang - Saratoga CA, US
Prashant P. Gandhi - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/54

US Classification:

370392, 370419, 709220, 709223, 715735

Abstract:

A blade switch for increased interface scalability is provided. The blade switch may address interface scalability by having each of the switch linecards manage its interfaces locally and may use the concept of virtual and local interfaces for intelligent forwarding. The blade switch may appear as a single network switch having a single bridge ID from the network perspective during operation and from the customer perspective during configuration.

US Patent:

20050198371, Sep 8, 2005

Filed:

Feb 19, 2004

Appl. No.:

10/782314

Inventors:

Michael Smith - Morgan Hill CA, US
Jeffrey Wang - Saratoga CA, US
Ali Golshan - Palo Alto CA, US

International Classification:

G06F015/173

US Classification:

709238000

Abstract:

A virtual network device includes several different virtual network device sub-units, which collectively operate as a single logical network device. An interface bundle includes interfaces in more than one of the different virtual network device sub-units included in the virtual network device. The interface bundle is coupled to a virtual link bundle, which connects the virtual network device to another device. The interface bundle is managed as a single logical interface.

US Patent:

20050243826, Nov 3, 2005

Filed:

Apr 28, 2004

Appl. No.:

10/833377

Inventors:

Michael Smith - Morgan Hill CA, US
Douglas Gourlay - Sausalito CA, US
Jeffrey Wang - Saratoga CA, US
Ali Golshan - Palo Alto CA, US

International Classification:

H04L012/28

US Classification:

370392000

Abstract:

An adjunct network device includes several ports, an uplink interface, and an adjunct forwarding engine coupled to the ports and the uplink interface. A first port is configured to receive a packet, which includes a destination address. The adjunct forwarding engine is configured to send the packet to the uplink interface if the destination address is not associated with any of the ports. The packet is sent to one of the ports if the destination address is associated with the one of the ports.