Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Reexamination Certificate
2011-01-11
2011-01-11
Chou, Albert T (Department: 2471)
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
C370S221000, C370S225000, C370S242000
Reexamination Certificate
active
07869345
ABSTRACT:
In one embodiment, an edge device communicates with a neighboring routing domain. A failure that prevents communication between the edge device and the neighboring routing is detected. When the edge device thereafter receives a data packet that is directed to the neighboring routing domain, it determines if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain. If the received data packet was not rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device reroutes the received data packet to another edge device for forwarding to the neighboring routing domain. However, if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device prevents the received data packet from being rerouted a second time to prevent loops.
REFERENCES:
patent: 6339595 (2002-01-01), Rekhter et al.
patent: 6665273 (2003-12-01), Goguen et al.
patent: 6778492 (2004-08-01), Charny et al.
patent: 6813242 (2004-11-01), Haskin et al.
patent: 7180866 (2007-02-01), Chartre et al.
patent: 7535828 (2009-05-01), Raszuk et al.
patent: 7633859 (2009-12-01), Filsfils et al.
patent: 2002/0060985 (2002-05-01), Lee et al.
patent: 2002/0112072 (2002-08-01), Jain
patent: 2003/0028818 (2003-02-01), Fujita
patent: 2003/0229807 (2003-12-01), Qiao et al.
patent: 2003/0233595 (2003-12-01), Charny et al.
patent: 2004/0052207 (2004-03-01), Charny et al.
patent: 2004/0081085 (2004-04-01), De Cnodder et al.
patent: 2004/0109687 (2004-06-01), Park et al.
patent: 2004/0196827 (2004-10-01), Xu et al.
patent: 2006/0221813 (2006-10-01), Scudder et al.
patent: 2009/0245259 (2009-10-01), Filsfils et al.
Andrew S. Tanenbaum, “Computer Networks”, Fourth Edition, Section 1.4.2 pp. 41-44, Pearson Education 2003.
Radia Perlman, “Interconnections Second Edition: Bridges, Routers, Switches, and Internetworking Protocols”, Chapter 9 pp. 189-220, Addison Wesley Longman, Inc. 2000.
Radia Perlman, “Interconnections Second Edition: Bridges, Routers, Switches, and Internetworking Protocols”, Sections 12.1-12.3 pp. 299-324, Addison Wesley longman, Inc. 2000.
Stephen A. Thomas, “IP Switching and Routing Essentials”, Chapter 7 pp. 221-243, 2002.
Ivan Pepelnjak and Jim Guichard, “MPLS and VPN Architectures”, Chapters 8-9 pp. 145-205, Cisco Press 2001.
E. Rosen and Y.Rekhter, “BGP/MPLS VPNs”, Request for Comments 2547, Mar. 1999.
Y. Rekhter and T. Li, “A Border Gateway Protocol 4 (BGP-4)”, Request for Comments 1771, Mar. 1995.
Clarence Filsfils et al., “Fast Reroute (FRR) Protection At the Edge of a RFC 2547 Network”, U.S. Appl. No. 11/010,225, filed Dec. 10, 2004.
Clarence Filsfils et al., “Loop Prevention Technique for MPLS Using Two Labels” U.S. Appl. No. 11/046,163, filed Jan. 26, 2005.
Clarence Filsfils et al., “Loop Prevention Technique For MPLS Using Service Labels” U.S. Appl. No. 11/068,081, filed Feb. 28, 2005.
W. Mark Townsley et al., “Encapsulation of MPLS over Layer 2 Tunneling Protocol Version 3”, Internet Draft draft-townsley-mpls-over-12tpv3-oo.txt available at http://www.ietf.org, Dec. 2004.
W. Mark Townsley et al., “BGP/MPLS IP VPNs over Layer 2 Tunneling Protocol ver 3”, Internet Draft draft-townsley-l3vpn-12tpv3-01.txt available at http://www.ietf.org, Jan. 2004.
Clarence Filsfils et al., “Algorithm for Backup PE Selection”, U.S. Appl. No. 11/084,838, filed Mar. 18, 2005.
Stephen A. Thomas, “IP Switching and Routing Essentials”, Chapter 2 pp. 25-64, 2002.
Filsfils Clarence
Scudder John Galen
Ward David D.
Cesari and McKenna LLP
Chou Albert T
Cisco Technology Inc.
LandOfFree
Loop prevention techniques using encapsulation manipulation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Loop prevention techniques using encapsulation manipulation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loop prevention techniques using encapsulation manipulation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2664595