Pre-dropping of a packet if its time-to-live (TTL) value is...

Details Pre-dropping of a packet if its time-to-live (TTL) value is... Pre-dropping of a packet if its time-to-live (TTL) value is...

2008-08-03

2011-10-11

Sheikh, Ayaz (Department: 2476)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S392000, C709S238000, C709S243000

Reexamination Certificate

active

08036220

ABSTRACT:
A packet is pre-dropped if its Time-To-Live (TTL) value is not large enough to reach a destination, such as, but not limited to, its destination if it is a unicast packet, or at least one more destination for a multicast packet. A packet switching device maintains associations between (a) nearest receiving node distances and (b) prefixes or complete addresses. If a packet does not have enough TTL to reach an intended recipient identified by a corresponding nearest receiving node distance, then the packet is dropped even though the TTL has not expired. In this manner, some bandwidth and other network resources are not wasted on traffic that will timeout via the TTL mechanism before reaching a subsequent intended recipient.

REFERENCES:
patent: 6611872 (2003-08-01), McCanne
patent: 2002/0191584 (2002-12-01), Korus et al.
patent: 2005/0027782 (2005-02-01), Jalan et al.
patent: 2006/0088031 (2006-04-01), Nalawade
patent: 2006/0221963 (2006-10-01), Takayanagi et al.
patent: 2008/0144523 (2008-06-01), Nishi et al.
patent: 2008/0159163 (2008-07-01), Valli
RFC 1584 (Moy, “Multicast Extensions to OSPF”, Published: Mar. 1994;).
Meyer, “Administratively Scoped IP Multicast,” RFC 2365, The Internet Society, Jul. 1998, 8 pages.
Hanna et al., “Multicast Address Dynamic Client Allocation Protocol (MADCAP),” RFC 2730, The Internet Society, Dec. 1999, 53 pages.
Fenner et al, “Protocol Independent Multicast—Sparse Mode (PIM-SM): Protocol Specification (Revised),” RFC 4601, The Internet Society, Aug. 2006, 150 pages.

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