Tunneling loop detection control apparatus

Details Tunneling loop detection control apparatus Tunneling loop detection control apparatus

2011-06-28

2011-06-28

Ferris, Derrick W (Department: 2463)

Multiplex communications

Diagnostic testing

Reexamination Certificate

active

07969892

ABSTRACT:
Disclosed is a technique whereby a tunnel entry point, which encapsulates a packet (generates a tunnel packet), can detect the presence of a tunneling loop causing a packet to loop the same path while encapsulated. According to this technique, upon receipt of a packet from a source node (source)1100, TEP (tunnel entry point)1120inserts it into a tunnel packet header for encapsulation. Upon receipt of tunnel packets from TEP1120and TEP1140, each of TEP1140and TEP1160copies the identifier of the original tunnel packet header to a new tunnel packet header for encapsulation. When this tunnel packet returns to TEP1120due to a tunneling loop, the tunneling loop is detected by referring to the identifier in the received tunnel packet.

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A. Conta, et al., “Generic Packet Tunneling in IPv6 Specification,” RFC2473, Dec. 1998, pp. 1-36.

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