Cisco Technology, Inc.

Richard Foltak

Jeffrey David Haag

Lio Cheng

Samuel G Henderson

Gary Lee Harris

Edward John Groenendaal

A mechanism for synchronizing states of components in a first routing engine to corresponding components in a second routing engine is provided. In order to reduce the amount of data required to synchronize the state of the components and the time and resources required to perform the synchronization, the state-related information transmitted from the first routing engine to the second routing engine is limited to information used to build states of a subset of the components associated with the first routing engine. That subset of components is limited to those components that receive stimuli (e.g., data streams or data packets) from sources external to the routing engine. Other components on the second routing engine synchronize state by receiving information from those components on the second routing engine that received the external stimuli information.

Session redundancy using a replay model

A network access server (NAS) for use in a communications system utilized by users of telephone, fax, or modem calls, the NAS having more than one processor with a plurality of processors forming a module, each processor for performing various functions by executing code stored in memory device accessible by the processor wherein either upgrading of the stored code or recovery of one or more of the processors is required. Upon determining that one or more processors are 'bad', the NAS and schedules recovery of the 'bad' processor during a window of time defined by a predetermined duration of time in the day during which the communications system is least utilized by the users, disables the particular module so that no calls are processed through the particular module and attempts recovery of the &#x2018;bad&#x2019; processor during the window of time.

Module firmware recovery

A method, system, and apparatus are provided for maintaining a common unique session identifier for a call over a network. In at least one embodiment, a unique session identifier is created by appending the IP address of an access server to a local session identifier.

Maintaining a common AAA session ID for a call over a network

A method, system, and apparatus are provided for maintaining a common session identifier for a call over a network. In at least one embodiment, the session identifier is provided as a non-required parameter in accordance with a tunnel protocol.

Maintaining a common AAA session id for a call over a network

A PSTN (Public Switching Telephone Network) device includes a Dynamically Configurable Signaling State Machine (DCSSM). The DCSSM can be programmed to recognize multiple signaling templates. The DCSSM can also be programmed to modify existing recognized standardized signaling templates. Programming is accomplished via a configuration interface. Commands are sent to the DCRSSM via the PSTN device's configuration interface. When the trunk controller receives a signal or is required to transmit a signal, the DCSSM executes the directives configured with the programmed signaling templates within a signaling state machine.

Configurable digit collection for various signaling protocols

A method and apparatus of the present invention includes a network access server (NAS) for use in a communications system utilized by users of telephone, fax, or modem calls, the NAS having more than one processor with a plurality of processors forming a module, each processor for performing various functions by executing code stored in a memory device accessible by the processor wherein either upgrading of the stored code or recovery of one or more of the processors is required. The NAS determines that one or more of the processors of a particular module is 'bad', marks the bad processors as being in a 'Recovery Pending' state, schedules recovery of the &lsquo;bad&rsquo; processor during a window of time defined by a predetermined duration of time in the day during which the communications system is least utilized by the users, disables the particular module so that no calls are processed through the particular module, attempts recovery of the &lsquo;bad&rsquo; processor during the window of time and if the step of attempting recovery takes longer than the window of time, stops the recovery and retries recovery during the window of time on the next day.

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Plano, TX, United States of America

Richard Foltak