Los Angeles, CA--May 17, 1996--A routing source code softwareproduct for the ATM Forum Private Network-Node Interface (PNNI)specification has been announced by Trillium Digital SystemsInc. (Brentwood, CA) The PNNI protocol provides a mechanism for routing data between private asynchronous transfer mode (ATM) switches or networks of ATM switches. It has two parts: (a) a routing protocol for distributing topology information and for routingconnections across ATM switches, and (b) a signalling protocol to establish and release connections made by the routing protocol.
Currently, ATM switches use statically configured routes toswitch signalling information. Under PNNI, ATM switches canexchange network topology state information, and update theirrouting tables dynamically. A key feature of PNNI is that it isa hierarchical routing protocol, which allows it to scale from smallto very large networks.
The latest release of Trillium's PNNI software complies with theATM Forum PNNI specification, version 1.0 revision 16. Thecurrent release of PNNI supports the single peer group model. Alater release, scheduled for the third quarter of 1996, willsupport the multiple peer group model.
The PNNI software supports interconnection and topology databasesynchronization and flooding functions with neighboring PNNIswitches, route generation based on the topology database, DTLgeneration and formatting for PNNI signalling messages, andcrankback processing to reroute a call when the originallygenerated route does not succeed. The PNNI software alsospecifies the mechanism for partially source-routing a callwithout specifying how manufacturers compute the route. Thisleaves manufacturers free to implement their own algorithms forcomputing the routes from the topology database.
Trillium Digital Systems Inc.
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