Abstract:
Methods and systems consistent with the present invention provide broadband subscribers with dynamic, automatic routing information for accessing services offered by a service provider network ( 35 ) and/or content provider networks ( 40, 45 ). Client software on the subscriber&#39;s computer ( 10 ) retrieves a file such as an HyperText Markup Language (HTML) document from a predetermined server containing connection-oriented routing information for gaining access to various network services. The client software parses the HTML document and extracts the routing information. The client software then uses this routing information to populate and manipulate the subscriber computer ( 10 ) routing table.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS  
       [0001]    This application is entitled to the benefit of Provisional Patent Application Serial No. 60/404,458, filed on Aug. 19, 2002, bearing Attorney Docket No. 2002P13456US. 
     
    
     
       FIELD OF THE INVENTION  
         [0002]    The present invention relates to communications systems, and more particularly to methods and systems for dynamically updating routing tables in a broadband communications system.  
         BACKGROUND  
         [0003]    Routers route packets of data in and between networks, such as Transfer Control Protocol/Internet Protocol (TCP/IP) networks and the Internet. Routers use routing protocols and algorithms to map the topology of networks and then share that routing information with other routers. Routers store routing information in routing tables. If a network gets congested or a connection fails, a router uses the routing information in its routing table in an effort to find an alternate route.  
           [0004]    Broadband communications systems present a number of unique routing challenges. Broadband subscribers are rarely sophisticated enough to manually update their own routing table. As a result, their routing tables are often outdated and ineffective. In addition, when broadband subscribers access multiple Point to Point over Ethernet (PPPoE) sessions and multiple service providers, conventional systems tend simply to promote the route that corresponds to the last active interface. This can confuse routers and cause packets to be unintentionally dropped.  
           [0005]    One attempt to deal with the challenges discussed above is the PPPoE Active Discovery Network (PADN). PADN is an extension to PPPoE, which provides a standard method for building Ponint to Point (PPP) sessions and encapsulating PPP packets over Ethernet. PADN packets may include Internet Protocol (IP) routes that may be used by a Host, such as a Broadband Remote Access Server (BRAS) to populate it&#39;s routing table. Although PADN is an extension to PPPoE, it is not a standard and therefore many Hosts do not support PADN packets. In addition, utilization of PADN requires considerable manual oversight by a service provider, which can lead over time to unreliability.  
         SUMMARY OF THE INVENTION  
         [0006]    With the foregoing in mind, methods and systems consistent with the present invention provide dynamic up-to-date routing information to broadband communications systems. Methods and systems consistent with the present invention are compatible with existing Host equipment and do not require manual oversight by a subscriber or service provider. In an exemplary embodiment, service providers and/or content providers maintain routing information in a standard HyperText Markup Language (HTML) file that is accessed by a subscriber&#39;s computer system. The subscriber&#39;s computer system parses the HTML file and extracts routing information to automatically populate it&#39;s routing table. The subscriber&#39;s computer system then periodically polls the HTML file for changes and automatically updates its routing table when new routing information is available.  
           [0007]    These and other objects, features, and advantages in accordance with the present invention are provided in one embodiment by a method of providing routing information in a broadband communications system. The broadband communications system comprises a subscriber-data-processing system and at least one content-provider-data-processing system. The subscriber-data-processing system includes a client component of a broadband-access program. The method comprises the steps of (a) establishing at least one Point to Point over Ethernet (PPPoE) session between the subscriber-data-processing system and the at least one content-provider-data-processing system; (b) retrieving, by the client component on the subscriber-data-processing system, a file from a predetermined server containing routing information in a predetermined data format; (c) parsing, by the client component of the subscriber-data-processing system, the file to extract the routing information; and (d) populating, by the client component, a routing table on the subscriber-data-processing system based on the routing information.  
           [0008]    In another embodiment, a system is provided for supplying routing information in a broadband communications system. The system comprises a subscriber-data-processing system including a client component of a broadband-access program; at least one content-provider-data-processing system for providing content to the subscriber-data-processing system via at least one Point to Point over Ethernet (PPPoE) session; means for providing the client component of the subscriber-data-processing system with a file from a predetermined server containing routing information in a predetermined data format; means for parsing the file to extract the routing information; and means for populating a routing table on the subscriber-data-processing system based on the routing information.  
           [0009]    In another embodiment, a computer-readable medium is provided that contains instructions that cause a system to perform a method. The computer system includes a client program on a subscriber-computer system and a server program on a provider-computer system. The method comprises the steps of (a) establishing one or more Point to Point over Ethernet (PPPoE) sessions between the subscriber-computer system and the provider-computer system; (b) sending a file containing routing information in a predetermined data format from a predetermined server by the server program to the client program; (c) parsing, by the client program, the file to extract the routing information; (d) populating, by the client program, a routing table on the subscriber-computer system based on the routing information.  
           [0010]    In yet another embodiment, a computer-readable memory device is provided that is encoded with a data structure for transferring data between a client program and a server program during a broadband communications session. The data structure has entries comprising routing information in a predetermined format, maintained by the server program and for use by the client program, for managing and updating a routing table. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]    The invention is explained in more detail by way of example with reference to the following drawings:  
         [0012]    [0012]FIG. 1 illustrates a communications system consistent with the present invention.  
         [0013]    [0013]FIG. 2 is a flowchart illustrating steps of a method consistent with the present invention.  
         [0014]    [0014]FIG. 3 illustrates a route table consistent with the present invention.  
         [0015]    [0015]FIG. 4 illustrates an HTML file consistent with an exemplary embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION  
       [0016]    [0016]FIG. 1 illustrates a broadband-communications system consistent with the present invention. The communications system includes a subscriber-data-processing system  10 , such as a general-purpose computer or a mobile-computing device. The subscriber-data-processing system  10  is connected to a Digital-Subscriber-Line-Access Multiplexer (DSLAM)  20  through a Digital-Subscriber-Line (DSL) modem  15 . An Asynchronous-Transfer-Mode (ATM) network  25 , including a router or Broadband Remote Access server (BRAS)  30 , provides a path to a service-provider network  35  and to content-provider networks  40 ,  45 . The service-provider network  35  includes a service-provider data-processing system  37 . The content-provider networks  40 ,  45  include content-provider-data-processing systems  42 ,  47 .  
         [0017]    Methods consistent with the present invention are implemented by a client component of broadband-access software (the “client component”) residing on the subscriber&#39;s data-processing system  10  and by a server-component of broadband-access software (the “server component”) on the service provider&#39;s data-processing system  37  and/or on one ore more content providers&#39; data-processing systems  42 ,  47 . The client component and the server component work together to establish and manage a subscriber&#39;s broadband connection.  
         [0018]    [0018]FIG. 2 is a flowchart illustrating the steps of an exemplary embodiment of the present invention. To establish broadband communications, a subscriber begins by directing the client component to establish a connection with a service provider. In response, the client component authenticates to the service provider&#39;s IP network and establishes a broadband connection to the service provider (step  200 ). Once a connection is established, the service provider provides the subscriber with information about available content providers and/or associated services (step  205 ). The subscriber then selects a desired content provider and/or service (step  210 ) and the client module establishes a PPPoE session with the selected-content provider/service (step  215 ). The content provider authenticates the subscriber. Upon successful authentication to the content provider, the content provider or the service provider sends the subscriber a file containing routing information for reaching the content provider (step  220 ). These steps may be repeated to establish connections with one or more additional content providers.  
         [0019]    The file sent to the subscriber is set up and maintained by the content provider or the service provider. The file is stored by the content provider or service provider on a predetermined server in a predetermined format for access and use by a subscriber. One of skill in the art will appreciate that the predetermined format may be any data format suitable for conveying routing information to a subscriber. Examples include, but are not limited to, markup languages such as HyperText Markup Language (HTML), Extensible Markup Language (XML), and Standard Generalized Markup Language (SGML).  
         [0020]    When the client component on the subscriber&#39;s data-processing-system receives the file containing routing information in a predetermined data format, the client component parses the content of the file to extract the routing information (step  225 ) and then updates the subscriber&#39;s routing table based on that routing information (step  230 ). The client component then periodically polls the file to determine if its contents have changed and, if they have, the client component updates the subscriber&#39;s routing table accordingly (step  235 ).  
         [0021]    [0021]FIG. 3 illustrates a typical routing table. Routing tables are well-known. The routing table illustrated in FIG. 3 includes a first column, entitled “Network,” listing IP addresses corresponding to network address of content providers. The second column, entitled “Mask,” provides sub-net addresses corresponding to content providers. The third column, entitled “Gateway,” provides addresses of gateways (or routers) that provide access to content-provider networks. Column four, entitled “Interface,” identifies interfaces (or virtual adapters) associated with content providers. Column five, entitled “Metric,” specifies which interface to promote first.  
         [0022]    [0022]FIG. 4 illustrates a list of HTML instructions from an exemplary HTML file consistent with the present invention. The HTML file contains routing information for populating a subscriber&#39;s routing table. The client component on the subscriber&#39;s data-processing-system parses the content of the HTML file to extract the routing information and then updates the subscriber&#39;s routing table accordingly. As shown in FIG. 4, the file may include both route-related and non-route-related instructions. The route-related instructions may include, for example, instructions for manipulating aspects of the subscriber&#39;s routing table. In the HTLM file shown in FIG. 4, for example, lines  1  through  3  define the polling period for the HTML file. The polling period instructs the client component to poll the HTML file at a specified time interval. In this case, the time interval is specified as ten minutes. Lines  4  through  13  include generic HTML instructions not related to the present invention. Line  14  is an HTML section header that identifies the beginning of routing information. Lines  15  and  16  instruct the client component to add two specific routes, 205.87.72.0, 255.255.255.0, 205.87.72.1,1 and 206.87.72.0, 255.255.255.0, 206.87.72.1,1, to the subscriber&#39;s routing table. Line  17  instructs the client component to delete a route, 206.87.72.0, 255.255.255.0, 206.87.72.1,1, from the subscriber&#39;s routing table. Line  18  instructs the client component not to delete the default route in the subscriber&#39;s routing table by specifying a DeleteDefaultRoute value of 0. A DeleteDefaultRoute value of 1 would instruct the client component to delete the default route. Line  19  specifies a Version identifier of 3. This Version identifier is used by the client component to determine whether the HTML file has changed since the last time the client component accessed the file. The client component periodically polls the HTML file for updated content by comparing the current Version identifier with the Version identifier for the last HTML-routing-file accessed. If the Version number has changed, the client component uses the new HTML-routing-file to update the subscriber&#39;s routing table to reflect the more current routing information.  
         [0023]    The present invention has been described with reference to the accompanying drawings that illustrate preferred embodiments of the invention. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Thus, the scope of the invention should be determined based upon the appended claims and their legal equivalents, rather than the specific embodiments described above.