Method and apparatus for storing and retrieving routing...

Details Method and apparatus for storing and retrieving routing... Method and apparatus for storing and retrieving routing...

H - Electricity

04

L

H04L 12/56 (2006.01)

Patent

CA 2160820

Method and apparatus for storing and retrieving routing information in a node of a network, such as an ATM network, are disclosed. A routing table in each node of the network stores the routing information for each active call connection through the node, for example, identified by a virtual path identifier (VPI) and a virtual channel identifier (VCI). The routing table is indexed by a modified header error control (HEC) value, which may be the actual HEC value associated with a given cell, or a value calculated therefrom. Upon receipt of an incoming cell at a network node, the modified HEC value is calculated, to access the appropriate entry of the routing table. The routing table preferably stores a pointer to a memory location, such as a linked list of data structures, storing the actual routing information for each connection. An intermediate node data structure preferably stores the routing information for a particular connection through an intermediate node of the ATM network, while a leaf node data structure preferably stores the routing information for a particular connection associated with a leaf node of the ATM network. If a data structure in the indicated linked list has a VPI/VCI value matching the VPI/VCI value in the received cell header, the routing information for the next link of the call connection is retrieved, and the cell header information is validated.

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