System and method for efficiently handling multicast packets...

Details System and method for efficiently handling multicast packets... System and method for efficiently handling multicast packets...

2005-06-28

2005-06-28

Dinh, Dung C. (Department: 2153)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

C709S242000, C370S389000, C370S392000, C370S395530

Reexamination Certificate

active

06912589

ABSTRACT:
A method and system for efficiently handling forwarding of multicast packets by ignoring VLAN (virtual local area network) context during lookup. In one embodiment, the present invention receives, at an intermediate device, multicast registration information for a client. The present embodiment then creates a forwarding database of the multicast registration information. In the present embodiment, when handling a multicast packet at an intermediate device, the present invention accesses the multicast registration information stored in the forwarding database. More particularly, in this embodiment, the present invention accesses the multicast registration information stored in the forwarding database without utilizing VLAN context of the client. As a result, the present invention allows the intermediate device to forward a single multicast packet which will later be supplied to registered member ports. The member ports apply the appropriate VLAN context. In so doing, the present invention prevents unnecessary replication of multicast packets and avoids superfluous expensive lookups in multicast registration tables.

REFERENCES:
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patent: 5892922 (1999-04-01), Lorenz
patent: 6188691 (2001-02-01), Barkai et al.
patent: 6208649 (2001-03-01), Kloth
patent: 6343289 (2002-01-01), Hunter et al.
patent: 6570875 (2003-05-01), Hegde
Cisco VLAN Roadmap. www.cisco.com/warp/public/538/7.html, Jul. 17, 1995.

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