Method for determining non-broadcast multiple access (NBMA) connectivity for routers having multiple local NBMA interfaces
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United States of America Patent
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Oct 5, 2010
Grant Date -
N/A
app pub date -
Jan 29, 2004
filing date -
Jul 6, 1998
priority date (Note) -
Expired
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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.
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