Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2005-01-25
2005-01-25
Pham, Chi (Department: 2667)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
Reexamination Certificate
active
06847638
ABSTRACT:
A method and apparatus for a router to inform a Layer2switch by use of packets of a new router group port management protocol (RGMP) that the layer2switch is to forward multicast packets of a specified group to the router. First the router transmits a RGMP HELLO packet to the layer2switch to inform the switch that the router is a multicast router implementing the invention. Then, in the event that the router receives an IGMP packet from an end station requesting multicast packets of a particular group, in response the router sends an RGMP JOIN packet to the layer2switch. The RGMP JOIN packet requests that the layer2switch forward only multicast group packets, of the group whose group number is written into a field of the RGMP JOIN packet, to the router. Also, the router sends a prior art PIM JOIN packet to other multicast routers in order to be placed on the multicast distribution tree for that group. The layer2switch builds a forwarding table for multicast groups listing ports connected to routers having sent a RGMP JOIN for that group. When a multicast group packet arrives at the layer2switch, the switch uses the forwarding table to forward the packet only to those routers requesting that group.
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Cai Yiqun
Chandika Nagarani
Mellacheruva Ramana
Wu Ishan
Cesari and McKenna LLP
Cisco Technology Inc.
Jones Prenell
Pham Chi
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