Multiplex communications – Diagnostic testing – Path check
Reexamination Certificate
2003-02-12
2008-12-09
Chan, Wing F. (Department: 2619)
Multiplex communications
Diagnostic testing
Path check
C370S225000
Reexamination Certificate
active
07463591
ABSTRACT:
Detecting if a label-switched path (LSP) is functioning properly. To test that packets that belong to a particular Forwarding Equivalence Class (FEC) actually end their MPLS LSP on an label switching router (LSR) that is an egress for that FEC, a request message carrying information about the FEC whose LSP is being verified may be used. The request message may be forwarded like any other packet belonging to that FEC. A basic connectivity test as well as a fault isolation test are supported. In a basic connectivity test mode, the packet should reach the end of the LSP, at which point it is sent to the control plane of the egress LSR. The LSR then verifies that it is indeed an egress for the FEC. In a fault isolation test mode, the packet is sent to the control plane of each transit LSR, which performs various checks that it is indeed a transit LSR for the LSP. The transit LSR may also return further information that helps check the control plane against the data plane, i.e., that forwarding matches what the routing protocols determined as the path. A reliable return path is used for the reply.
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Kompella, K., et al. “Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures,”Request for Comments: 4379, (The Internet Society, Feb. 2006) pp. 1-47.
Awduche, D., et al. “RSVP-TE: Extensions to RSVP for LSP Tunnels,”Request for Comments: 3209, sections 4.6.1.1 and 4.6.2.1, (Internet Engineering Task Force, Dec. 2001) pp. 1-57.
U.S. Appl. No. 11/848,780, filed Aug. 31, 2007, listing Nitin Bahadur and Kireeta Kompella as inventors, (41 pgs. and 14 Sheets of drawings (Figs. 1-17).
Kompella Kireeti
Pan Ping
Sheth Nischal
Chan Wing F.
Juniper Networks, Inc.
Pokotylo John C.
Straub and Pokotylo
Tsegaye Saba
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