Method for determining non-broadcast multiple access (NBMA)...

Details Method for determining non-broadcast multiple access (NBMA)... Method for determining non-broadcast multiple access (NBMA)...

2004-01-29

2010-10-05

Sheikh, Ayaz R (Department: 2476)

Multiplex communications

Pathfinding or routing

C370S389000

Reexamination Certificate

active

07808968

ABSTRACT:
The present invention discloses an efficient architecture for routing in a very large autonomous system where many of the layer 3 routers are attached to a common connection-oriented layer 2 subnetwork, such as an ATM network. In a preferred embodiment of the invention, a permanent topology of routers coupled to the subnetwork is connected by permanent virtual circuits. The routers can further take advantage of both intra-area and inter-area shortcuts through the layer 2 network to improve network performance. The routers pre-calculate shortcuts using information from link state packets broadcast by other routers and store the shortcuts to a given destination in a forwarding table, along with corresponding entries for a next hop along the permanent topology. The present invention allows the network to continue to operate correctly if layer 2 resource limitations preclude the setup of additional shortcuts.

REFERENCES:
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patent: 5917820 (1999-06-01), Rekhter
patent: 6055561 (2000-04-01), Feldman et al.
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patent: 6314105 (2001-11-01), Luong
patent: 6330614 (2001-12-01), Aggarwal et al.
patent: 6418476 (2002-07-01), Luciani
patent: 6711152 (2004-03-01), Kalmanek et al.

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