Deborah L Fitzgerald

US Patent:

20120063453, Mar 15, 2012

Filed:

Nov 9, 2010

Appl. No.:

12/942282

Inventors:

Srikanth Keesara - Tewksbury MA, US
Christopher Monti - Tyngsboro MA, US
Richard Thomas Strong - Amherst NH, US
Deborah Ellen Fitzgerald - Acton MA, US

Assignee:

AVAYA INC. - Basking Ridge NJ

International Classification:

H04L 12/56

US Classification:

370390

Abstract:

Methods and apparatus provide for a network device(s) employing tree tracer processing of a data packet(s) and/or a response(s) in order to discover and graphically represent all the paths within a hierarchical tree of network devices for multicast traffic flows. Specifically, a first network device receives a data packet. The data packet provides a multicast target MAC address. The first network device forwards the data packet to a plurality of network devices, where each of the plurality of the network devices belong to a multicast group identified according to the multicast target MAC address. Based on receipt of the data packet, the first network device generates and transmits a first response to a source of the data packet. The first response indicates a placement of the first network device with respect to a hierarchical tree of the plurality of network devices belonging to the multicast group.

US Patent:

20130077624, Mar 28, 2013

Filed:

Sep 23, 2011

Appl. No.:

13/241869

Inventors:

Srikanth Keesara - Tewksbury MA, US
Richard T. Strong - Amherst NH, US
Deborah E. Fitzgerald - Acton MA, US

Assignee:

Avaya Inc. - Basking Ridge NJ

International Classification:

H04L 12/56

US Classification:

370390

Abstract:

Techniques disclosed herein include systems and methods for improving multicast traffic operations in a Shortest Path Bridging (SPB) network by conveying bridging domain information of an incoming interface (IIF) when transporting multicast traffic over the SPB network. Techniques disclosed herein include modifying encapsulation packet header information of existing Mac-In-Mac fields to convey additional information that can be interpreted at edge nodes by modifying edge node interpretation of multicast data. Specifically, the value of the I-SID in the BMAC-DA field can be set to be different from the I-SID value in the I-TAG field. Carrying the L2 VSN I-SID value in the I-TAG allows the Egress BEBs to determine which VLAN/L2 VSN/Bridging-Domain of the IIF is in use, and then modify or preserve underlying header information accordingly.

US Patent:

20130128751, May 23, 2013

Filed:

Nov 23, 2011

Appl. No.:

13/303615

Inventors:

Srikanth Keesara - Tewksbury MA, US
David E. Frattura - Boston MA, US
Deborah E. Fitzgerald - Acton MA, US
Christopher Monti - Tyngsboro MA, US

Assignee:

AVAYA INC. - Basking Ridge NJ

International Classification:

H04L 12/26

US Classification:

370248

Abstract:

A network management and monitoring application employs diagnostic messages for confirming network path connectivity and identifying and locating connectivity faults. Diagnostic messages similar to conventional “ping” and “traceroute” messages traverse the network along a prescribed path for which diagnostic feedback is desired. The application receives and analyzes return messages sent from network entities along the path to ascertain connectivity issues on the path. The application receives layer 3 identifiers such as IP addresses, however performs diagnostic operations such as continuity checks based on layer 2 identifiers such as MAC (Media Access Control) identifiers because certain network entities operate on L2 identifiers and would otherwise evade a continuity check based on layer 3 identifiers. The monitoring application therefore performs continuity diagnostics such as ping and traceroute operations using L2 identifiers, therefore pinpointing problems with an L2 network forwarding entity such as a bridge that lies between L3 entities such as routers.

Author:

Deborah Kay Fitzgerald

ISBN #:

0300088132

Author:

Deborah Kay Fitzgerald

ISBN #:

0801422337